How to make a drill sharpening machine

DIY drill sharpener – Machine tools, welding, metalworking

Drills must be of high quality and well sharpened by a professional craftsman. In the old days, drill sharpening was done by hand.

Today, special devices for sharpening drills have appeared, and their design is very simple.

Why is sharpening needed?

If the drill becomes dull, it is very difficult, and sometimes impossible, for them to drill through the surface. It is also worth noting that for different types of surfaces, drills must have a certain sharpening angle, for example, for a plastic surface the angle will be 30 degrees, for hardened steel this angle will be 130 degrees.

In cases where a perfectly drilled hole is not required, the sharpening angle can be 90 degrees.

How to properly sharpen a drill

You can sharpen the drill yourself using abrasive discs. During sharpening, the drill must be held by the working surface. You need to hold the tail of the drill with your other hand.

From the side, the drill must be pressed against the abrasive disc. Then it is advisable to turn it with extreme care, as a result the cutting edge will take the required angle and structure.

Sharpening the drill must be done on each side separately. It is also necessary to ensure that the tip of the drill is located exactly in the center when sharpening the cutting part. This must be done correctly, as an error in sharpening can cause the drill to skewer to the side.

Sharpening a drill with your own hands is not the best way, since it can lead to a number of inaccuracies, for example, the cutting edges may not be correct in relation to the axis of the tool.

Sharpening device

The device is designed for sharpening blind or through drills made of cast iron and steel. This device is made taking into account the types of sharpening, as well as its size. It is easy to change the sharpening angle on the machine.

There are two types of devices that will help sharpen a drill: a household and an industrial machine. In the first case, the sharpening device takes up little space and fits perfectly into the home, but such a machine can only sharpen small drills.

Industrial machines that are made to sharpen drills with large diameters have great power. The industrial machine has a clamp and a sharpening wheel.

With this device, drill sharpening occurs under the supervision of an operator who can easily control the process. Such devices are designed for long-term operation.

How to make a machine for sharpening drills with your own hands

We will need the following materials: an abrasive disc, a switch, a motor with good power, a stand, wires, an axle and a plug. Also, for the safe use of the machine, it must have a housing, outside of which it is necessary to place an axis with an abrasive wheel for operation.

You first need to decide on the installation location of the machine, since it will be connected to an outlet.

Also, our device should be placed on a table, preferably made of metal, where the engine will need to be placed, and marks should be placed for making holes for the bolts.

An abrasive disc is placed on the motor shaft. To secure it to the shaft, you must first put on the washer, then the disk, and then the washer again. After this, you should install the fastening nut on the pre-prepared thread on the shaft.

The motor from a washing machine is perfect for our device. The power of its motor will be sufficient for the process of sharpening drills. Wires can also be taken from improvised equipment.

You need to connect the wires to the starter, which should have three open contacts. The winding must be capable of connecting phase lines using two starters connected in series.

The off button should be connected to NC, and the start button will be connected to NO, and it should also be in parallel connection with two NO contacts of the starter.

When you press the power button, voltage will be applied to the winding and as a result the circuits should close. When the button is released, the voltage supplied to the starter should not be removed. When disconnected, the engine must stop.

The engine itself is a safe device, but to protect its mechanisms from dust it is necessary to make a frame that will protect it from environmental influences.

To make it, you can use a metal box or make a protective screen out of glass. It is also worth installing a casing that covers the end of the disk by a third. It will protect the worker if the abrasive disc cracks.

Photo of sharpening drills with your own hands

Source: https://stanki-info.com/tochilka-dlya-sverl-svoimi-rukami/

Machine for sharpening drills: household, homemade, professional

For smooth operation, accurate and centered drills are required. We suggest considering where you can buy a machine for sharpening drills, how a homemade unit is made, as well as how household models differ from industrial ones and what their price is.

Types of drills and basic concepts

There are several types of drills, because... They are divided according to the principle of operation and the relationship of the working surfaces; they also need to be sharpened in different ways; let’s get acquainted with the main ones:

• spiral. Used in almost all types of industry, household work, repairs, etc.;
• flat - these are more narrow-profile tools, they are mainly used when drilling holes of large diameters; they got their name due to the flat working edge, which is very similar in shape to a reamer.

Let's consider the fundamental provisions for sharpening twist drills and countersinks:

During the movement of the cutting surface in the material, chips are formed inside the processed raw material, this process is especially evident in the front surface. It is the large accumulation of chips that plays the main role in the deformation of the plastic parts of the drill: during operation it heats up, and under the influence of the sharp ends of the chips, its working edge changes. Of course, there is a huge difference in the speed of this process, the most dangerous and toughest is copper and steel.

Photo - Cleaning the drill from chips

Drilling is carried out according to the following scheme: during operation, a conical surface is described; this shape is also acquired by the working surface of the drill; accordingly, the cutting edge becomes somewhat blunt and changes its center. All corners of the working surface must be located above the surface of the end, this is the only way to ensure a normal and standard clearance angle.

The easiest and most effective way to sharpen a drill at home is to use an electric sharpener.

You can work with a regular sharpening bar made from a mixture of abrasive materials, but such a process will take a lot of time and effort, unlike operating a device with an electric motor.

The universal manual grinding apparatus has a motor whose speed is 1500-2000 min-1. Optimal power: up to 300 watts. Such models are available from Doctor, Vollmer, Sturm, Proxxon, Drill and Weinig.

Photo - Sharpened drills

Orientation is carried out along the cutting edges; you must act strictly in the direction of the spiral grooves, because they do not change their shape even when exposed to large amounts of chips.

We fix the drill so that the edge that will be sharpened is strictly parallel to the axis of the grinding tool. The most important question: when is the working part sharpened? As soon as you see a reflection of light from the working surface, this means the edge has been sharpened.

Using the same system, we sharpen the second side.

Photo - Sharpening drills

In this case, it is very important not to miscenter the drill earlier, in which case you will lose its balance, and during operation the tool will deviate by several degrees from the standard parameters. The angle between the lumps is the most important sharpening parameter.

Photo - Cutting angle

Standard sizes are as follows:

Alloy steel, structural, tool - 90 degrees;

Soft metals (copper, aluminum, aluminum alloys) – 90-100 degrees;

Wood, plastic, rubber – 90-100;

Bronze, brass – 110-120.

In order to achieve high processing accuracy with your own hands, you need to pay special attention to standard and deformed parameters. To control the sharpening process, you can order a special template for a drill with the desired diameter and angle. The photo shows a diagram of processing a drill with such a device.

Photo - Sharpening template

If you don’t have the money or time to purchase a template, use the “old-fashioned” method: we follow the rule of left-hand mechanics. We bend our hand and place it over the drill in such a way that the cutting surface is closed on several sides, we should get a kind of corridor. We place a lamp opposite the end surface and check the evenness and accuracy of sharpening (this will be clearly visible from a distance of 20 cm from the drill, if you look with one eye).

Photo - Left Hand RulePhoto - Glare Check

When using a homemade electric machine, it is very important to control the drill sharpening processing process. To completely violate the accuracy, it is enough to make a mistake of 1 mm. The automatic sharpening device for small diameter core drills can also be used for discs, knives, scissors, chains, etc.

Grinding machine Energomash TS 6010S

Professional ways

The methods listed above are suitable for home narrow-profile use, but if you need to sharpen drills serially, then you will not have enough time or effort for manual centering, checking or sharpening. Let's look at how a professional drill machine is used.

The grinding wheel should be made of fine abrasive material. The sharpening area should be illuminated at the correct angle in relation to the drill. The employee must wear safety glasses and gloves.

Step-by-step instruction:

1. Determine the correct sharpening angle;
2. Stand slightly to the left of the grinding wheel, legs apart. Check the alignment of the drill using your thumb and forefinger. Place the working surface in these fingers, and take the tail edge in the other hand; Photo - Correct position of the drill
3. We place the drill in a horizontal position, but the grinding wheel approaches at an angle of 60 degrees. Rotate the drill so that its cutting edge is parallel and close to the wheel. Then you can change the grounding point;
4. Eliminate the gap. You need to use your left hand so that the drill shank points down and to the left. The right hand supports the rest of the instrument. As soon as you move your left hand, you need to use the fingers of your right hand to move the drill forward clockwise in relation to the grinding wheel.
5. Sequence of movements: left hand down and to the left, right hand rotate the drill clockwise, both hands move forward. Look at the red arrow, which displays the center and the angle we need. It should be relative to the circle to the right and forward; Photo - Drill alignment
6. Now we move on to the second edge and process it in the same way. Afterwards you need to make sure that the edges are at an equal angle relative to the working surface;

Before choosing a machine for sharpening drills, you need to read reviews about it, carefully study the passport and capabilities. One mechanics forum even advised to always carry a drill with you so that you can check the effectiveness on the spot.

Price overview

Buying an inexpensive machine for sharpening drills in Ukraine, Russia or Belarus is possible, the main thing is to choose the right model (for metal, wood or plastic), caliber (dd750хibm, drillgrind, edbs2001 - universal), and power. We suggest considering the average prices for such devices:

City	Price, rubles	City	Price, rubles
Moscow	30 000	Minsk	27 000
Kyiv	30 000	Odessa	32 000
Kharkiv	30 000	Chelyabinsk	27 000
Smolensk	27 000	Samara	30 000
Voronezh	27 000	Krasnodar	27 000
Krasnoyarsk	27 000	Ufa	27 000

Nowadays, desktop and universal machines of such brands as DrillGrind, Sturm (manufactured by Energomash), BSG, BSM, ESM, MICRA, V391, Diold, EZS, NKCH are very popular. They can be found in a professional store, on the Internet, on forums in the “Selling electrical appliances” section. The main thing is to make sure that the documentation matches the data stated by the seller.

Source: https://www.asutpp.ru/stanok-dlya-zatochki-sverl.html

How to make a machine for sharpening drills with your own hands: types of devices, methods of manufacture and use

In order to drill a hole efficiently and quickly, you need a drill with a sharp tip. But it tends to dull. Of course, you can buy a new drill, but this is an extra expense, especially when you have to work a lot. In this case, a drill sharpening machine will come in handy.

A sharpening device is an automated equipment that has a narrow specialization and is intended only for sharpening drills. There are the following types of these devices, based on the scope of their use:

1. Industrial. They have great power. They can be used to sharpen a variety of drills with a diameter exceeding 20 millimeters. The main purpose of this device is intensive work with a high degree of profile specialization in large enterprises. The drill in industrial equipment is sharpened in partial or full automatic mode at the required angle using a fastening unit (special clamp).
2. Household. Can be used at home or in small businesses. These machines are characterized by mobility, compactness and low power. They can be used to sharpen small and medium-sized drills, which are most often used in everyday life.

a number of important advantages over other devices and devices that are used to restore the sharpness of a tool . The main ones are:

• A convenient ergonomic control system is capable of adjusting the intensity and speed of sharpening.
• It has a compact size and light weight.
• Any home craftsman can buy it, since the price is affordable for everyone.
• High level of functionality and sharpening accuracy.
• Easy to use.
• High degree of productivity.
• Operates from the mains with a standard voltage.

Household machines

All drill sharpeners used in everyday life are designed to sharpen spiral drills for metal, which consist of high-speed steel, structurally included in the equipment, of a certain range of diameters.

On many machines you can sharpen tools that are equipped with carbide inserts . For this procedure, a diamond wheel is included in the kit or purchased separately. Basically, they can sharpen drilling tools with a cone angle of 90 to 140 degrees on the flank surface, performing pointing and backing of the transverse cutting edge.

Specialized modifications are also available for metal drills:

• three-toothed;
• high-performance;
• with a two-plane backing;
• leftists, etc.

For home use, it is most convenient to use machines with a universal chuck for clamping drills of different diameters within technically acceptable sizes, as well as those devices that come with a set of removable chucks mounted on the body of the device itself. So they are at hand at any time.

As a rule, such equipment is equipped with a window through which the centering of the drilling tool in the working area can be seen. The kit also includes standard accessories:

1. Spare parts.
2. Keys.
3. Set of collets.
4. CBN circles.

Additional items such as a lamp for the work area, an additional set of collets, and diamond wheels can be supplied. The most common brands are GS, Drill Doctor and their Chinese-made analogues.

According to the range of sizes of drills that need to be processed, the machines are available in two types : the diameter of which ranges from 2-13 mm and 13-34 mm. Their disadvantage is that it is impossible to sharpen very thin drills.

In order to sharpen a small diameter drill, a special machine is needed. One of these is VZ-389SP. It is designed for sharpening tools with a diameter of 0.4-4 mm and is equipped with a 30x optical device in order to control the process.

How to choose the right equipment

Before choosing a sharpening machine for drills, you need to determine the scope of its future work. After all, when you buy it, you will need to be guided by the operational parameters.

If you plan to use the sharpener at home (home, garage), then you can buy an inexpensive, low-power model . After all, you will not constantly use the device. In this regard, a device with high power is simply useless.

In addition, industrial machines are designed for sharpening drills with large diameters, and they consume much more electricity than household appliances.

When you purchase a machine, pay attention to the presence of a special regulator , which is designed to adjust the rotation of the spindle. This function will allow you to make your work as safe and efficient as possible.

An important parameter is the size of the drills that you are going to sharpen on this device. A household sharpener should have a fairly low noise level , especially when you plan to place it in a residential area.

Particular attention should be paid to the design of the model that you like. If it is as simple as possible, that’s very good. If the device suddenly breaks down, there won’t be much trouble. You can easily find a new part you need and replace the old one that has failed.

It is also worth noting that many foreign models are quite expensive in terms of their maintenance, and sometimes it is not easy to get the necessary part.

It is best to select a sharpener for home work at specialized retail outlets, where you will be issued a technical passport and warranty card.

Sharpening drills at the factory

In some cases, at enterprises, a driller manually sharpens drills on conventional sharpening machines, which are equipped with a special device for this purpose. In order to do this, you first need to take special preparatory courses and learn all the rules of honing.

The device used for these purposes is a steel structure, which is equipped with a movable drill clamp with an inclination angle, which is adjustable relative to the grinding rotating wheel, and also has a mount on the body for fixing the sharpening machine.

Very often in production, when manually sharpening on a machine, no devices are used . In this case, the drill is held by the tail with the right hand, and as close to the cutting part as possible with the left.

The cutting edge is pressed against the side surface of the abrasive wheel, and with the right hand, at the same time, the element is gently rocked, trying to ensure that its back surface acquires the desired slope and takes the desired shape. The metal must be removed in small layers, lightly pressing it against the circle.

Make sure that the cutting edges of the tool have the same sharpening angles and are the same length. If you make a mistake when sharpening manually, it can lead to the following consequences:

• One-sided groove at the cross blade.
• Different angles formed by the axis of the tool and its cutting edges.
• Uneven length of cutting edges.

Due to such defects, the tool will drill holes larger than the tool itself; it is incorrect and one-sided to load on the cutting edges, in the end it will simply break; beat. After sharpening the tool, you need to check the following parameters for the transverse edge:

• width;
• length;
• correct position relative to the cutting edges;
• tilt angle.

Enterprises have templates . Using an optical device, the correct location of the jumper is determined. Also in some cases, the tool runout is checked.

Metal drills, which are made of high-speed steel, are sharpened on grinding wheels made of normal and white electrocorundum in a ceramic bond with a grain size of 16 to 40 and a hardness of CM, as well as on CBN wheels.

To sharpen tools equipped with carbide inserts, grinding wheels made of synthetic diamonds and green silicon carbide with a grain size of 16 to 40 are used.

If you don’t have a special sharpening machine at home, you can use the following tools to sharpen a drill: do-it-yourself sharpening devices; electric drill; conventional sharpening machine.

If you decide to use a regular sharpening machine, then buy a special device. After all, before you learn how to sharpen a tool without it yourself, you can ruin a very large number of drills. This device has approximately the same structure as the industrial one.

There are also options with a separate installation near the rotating grinding wheel on a horizontal surface, and not with mounting on the equipment body. Such a device can be made independently. It can be made of wood.

A beam with several holes, the diameter of which is equal to the required drills, is fixed to its base . These holes are drilled at an angle, thereby ensuring the required sharpening angle. You can also provide for changing the sharpening angle.

If an electric drill is used, it has a special sharpening attachment . They are commercially available only for sharpening at an inclination angle of 118 degrees, the size of which ranges from 3.5 to 10 in domestic ones and from 2.5 to 10 in imported ones. The size of the spindle neck in both of them has a diameter of 43 millimeters.

The body of such attachments has holes for different tool diameters, in the amount of 15 pieces. The attachments are equipped with a stone, the sharpening surface of which is located at a certain angle, as well as a leash for it, which is inserted into the drill chuck.

By shortening the length of the leash once, the attachment is configured to work with only one specific drill. They work with it according to the following scheme:

1. A leash with a stone at the end is inserted into the drill chuck.
2. Place the attachment on the spindle and secure it with a screw.
3. The drill is started and the tool is inserted into the hole in the nozzle body with the appropriate diameter.

such a device yourself . In a homemade attachment, it will be possible to provide the necessary tool diameters and sharpening angles. Homemade devices can be made in the form of ordinary sharpening machines. It is better to immediately provide a method for sharpening and fastening drills, so as not to invent additional equipment for this.

Source: https://tokar.guru/stanki-i-oborudovanie/dlya-raboty-s-metallom/kak-vypolnit-zatochku-sverl-zatochnoy-stanok-dlya-sverl-svoimi-rukami.html

Device for sharpening drills and accessories for it +

about step drills

Drill sharpening can be done manually, on machines or with special abrasive discs.

If you sharpen the drill by hand, then you need to:

• hold the shank firmly and guide its spiral part with the other hand;
• press the cutting edge of the drill against the side surface of the abrasive wheel;
• after sharpening one side, it is necessary to smoothly rotate the drill, while the cutting edges must have the correct inclination to the axis and take the desired configuration.

The drill is sharpened on both sides alternately. At the same time, be sure to control the cutting edges.

Remember! The tip of the drill should be exactly in the center.

Otherwise, it will deviate during operation. It is worth noting that under no circumstances should you put too much pressure on the drill, otherwise it may get defects (bending).

For example, if after sharpening you notice that the cutting edges are not the same and are inclined at different angles to the axis, then this means that the middle of the transverse edge is not in the center of the drill, and it will not work correctly.

Therefore, all experts recommend using a special sharpening machine for drills.

When sharpening, be sure to pay attention to the initial angle of the tool. It is he who will become your guide in the future. Then inspect the gimlet for damage:

• if you find serious defects, you can use coarse sandpaper;
• if the defects are small and the drill is only slightly dull, use a finishing wheel. This operation is necessary for thin drills;
• if the concrete drill has defects in the shank taper, process the upper part of the tool, carefully pressing it against the grinding wheel;
• After processing, carefully inspect the back surface of the drill again;
• If you notice, or determine with a template, that you have a perfect cone, you have sharpened the tool correctly.

After this, process the cutting edge of the drill. The size of the jumper for rational turning of the tool should be 1-1.7 mm.

What are the features of sharpening machines?

A homemade device for sharpening drills is designed for through and blind drills made of steel, cast iron and various hard alloys. Depending on the type, machines can be equipped with different functions. On some of them, you can vary the angle during operation.

There are sharpening machines:

• universal – used for various cutting tools;
• specialized - for one type.

Devices for sharpening drills are classified as universal machines, because they can be used to process:

• taps;
• cutters;
• dugouts;
• countersinks.

Machines are divided into two categories:

1. Industrial - have high power and are designed for sharpening large-diameter tools. Power depends directly on the engine.
2. A household drill sharpening machine is quite compact and is often used for home use. It can be used to process even small-diameter drills.

There are seven sharpening methods:

1. Single-plane.
2. Complex screw.
3. Shaped.
4. Elliptical.
5. Conical.
6. Two-plane.
7. Screw.

How to make a device for sharpening drills

To make a homemade machine you will need:

• toggle switch;
• abrasive wheel;
• stub;
• engine;
• stand;
• wires.

Follow our tips:

1. For safety reasons, place the homemade machine in the case, leaving only the axle and abrasive wheel outside. Remember, the device will work from the network.
2. Select in advance the location where your drill sharpening device will be placed. It is advisable that it be on a metal table.
3. Next, place the electric motor on the tabletop using fasteners (clamps) and mark the locations of the holes for the bolts, if it has legs.
4. After this, remove the electric motor and make 4 holes.
5. Later, reinstall the engine and secure it carefully with the bolts.

Tip: If the engine does not have legs, you can strengthen it with metal strips (clamps).

The electric motor for our future machine must be equipped with a special elongated shaft, onto which a granular disk should be placed. For this:

1. Install the fastening nut by first cutting a right-hand thread at the end of the shaft.
2. Secure the disc with a washer and nuts.

If the diameter of the shaft and the disc holes match, then install a washer on the shaft, and then an abrasive disc. If the diameter of the shaft and the hole do not match, then you will need to add a bushing.

First make a special side hole in it with a thread for a bolt in order to be able to secure it tightly to the shaft. After this you can put the sleeve on.

If you can’t decide on an electric motor, then just take the motor of an old washing machine. It is ideal for a homemade sharpening device.

It is worth noting that you must prepare in advance the starter and wires that will subsequently need to be connected. It is very important that the starter has at least three to four open contacts. Its winding must be connected using two buttons to the phase line.

Attention! The electric motor will be unsafe, regardless of the type - during operation, the rotating shaft can accidentally wind up a cord, wire, or hair.

Tip: Make a metal box to protect the machine from dust, abrasive particles, and you from accidental injuries.

How to properly sharpen a drill on a machine

1. When sharpening, you must ensure that the two shoulders of the drill are identical. If you achieve such a correspondence, then the axis of rotation of the drill will completely coincide with the center of the hole.
2. Before you start sharpening, be sure to ensure that the abrasive disc is tightly secured.
3. Always start the process with a coarser abrasive.

   Once a burr appears on your drill, you can change the abrasive to a finer one.

4. Watch the sharpening angle.
5. Do not allow the windings to switch so that the abrasive disc rotates in reverse. It should always move only in the direction of the blade.

Please note that drills cannot tolerate excessive overheating. Cool the gimlet regularly while sharpening.

But under no circumstances put a red-hot drill into water, as cavities may appear in it.

Additional accessories

about the Forstner drill

To avoid holding the drill suspended during sharpening (this can lead to injury), provide a support or guide in the form of a small attachment. It is made from a strip of metal, bent as shown in the figure and screwed to the frame (base). The drill is rested on it and brought to the circle at the desired angle.

Make marks (marks) on the guide described above for the required sharpening angles. It will become much more convenient to use.

If this is difficult for you, cut off the top part of a regular protractor and glue it to the guide.

Angles less than 300 are not used for sharpening, so we sacrifice them.

1. Universal device

To facilitate sharpening of tools, in particular drills, a mechanism has been developed consisting of a drill chuck, a shaft, roller guides (sled) and a protractor.

The main substrate described above is made wide. A protractor is glued onto it. A hole is drilled into which a bolt is inserted, which serves as an axis for the rotating surface.

A plate is installed on it on a roller slide, on which a pipe with a cartridge on the axis is fixed. The plate itself moves forward/backward using a conventional feed mechanism (threaded axis).

At the bottom of the rotating plate there is a displacement limiter indicator. It serves to rotate the device to the desired angle and to lock it.

Working with the device

1. A drill is inserted into the chuck.
2. The plate is turned to the desired angle and locked with a pointer.
3. Twist the handle to achieve the required sharpening of half the drill.
4. Notice the division.
5. Turn the drill 900 and repeat the operation, bringing the drill to the noticed point.

Source: https://refite.ru/prisposoblenie-dlya-zatochki-sverl.html

Drawings of a device for sharpening drills with your own hands

If you constantly deal with sharpening hard workpieces, the surface of the drill will very quickly become unusable. It will become dull, become very hot and eventually lose its former strength. All this is a consequence of “letting go” of the metal. That is why such a tool needs periodic sharpening using special devices .

How to make homemade devices for sharpening drills, what templates exist for this and what you need to prepare for work, you will learn from our article.

• Features of sharpening drills
• How to properly make a tool for sharpening drills with your own hands: training video
• Features of sharpening on a simple device
• Using an emery wheel in a homemade sharpening tool

Features of sharpening drills

Drills are inexpensive devices, especially if we talk about those that are widely used for household needs. However, if possible, then after they become dull, it is better to sharpen the tools than to buy new ones.

There are factory-made devices designed for sharpening, but buying them will cost you a lot, and this will not make up for the savings from not purchasing new tools. That is why many craftsmen assemble sharpening machines .

It is worth noting that dulling concerns metal drills, since wood tools are practically not susceptible to this, except when used at high speeds with resinous workpieces. Also, pobedit tips for stone or concrete cannot be sharpened

But many people sharpen metal drills using all the additional devices with their own hands, but the accuracy of such work is far from always ideal, so it is advisable to use at least a minimum of mechanics.

Perhaps it is useful for everyone to know how to properly sharpen a drill for metal.

How to properly make a tool for sharpening drills with your own hands: training video

To make such a device yourself, you will need a control tool (template). No matter how the drill is sharpened, the accuracy is checked with a special template.

Simple ferrous metal drills have an edge angle of 115 to 120 degrees. If the metal is different, then the sharpening angles will also be different:

• for carbide bronze, steel or cast iron it is also from 115 to 120 degrees;
• for soft bronze or brass alloys - from 125 to 135, respectively;
• for red copper 125 degrees;
• for aluminum and soft aluminum alloys, granite, ceramics and wood – 135 degrees;
• for magnesium and its alloys – 85 degrees;
• for plastic, textolite and silumin - from 90 to 100 degrees.

You can prepare several templates depending on the listed values ​​and, in accordance with them, sharpen them yourself. The same drill can be used for different types of workpieces; you just need to change the angles of the top of the workbench.

A simple but very convenient pulling device consists of bushings of different sizes that are attached to the base. You can make them yourself, based on special drawings. Remember that the tool should not be loose in the sleeve, and the quality of drilling may deteriorate even if the error is only one degree.

You can make a large clip based on aluminum or copper tubes, depending on the standard parameters of the drills, or you can take a block of soft material and make many holes in it. It is very important to place a convenient support in the sharpener, thanks to which you can move the sharpening device at the desired angle and hold the stop.

The listed sharpening devices have been manufactured for many decades in a row and are still in demand. To assemble a sharpening machine with your own hands, you can take an oak block instead of a corner.

The simplest sharpening machine can be assembled by simply installing a workbench or table opposite the side of the emery. Even such a simple device ensures high quality and accuracy of work.

Features of sharpening on a simple device

On the Internet you can find ready-made drawings of devices for sharpening drills, or sketch them yourself, but to do this you need to understand the principle of working with a drill.

During operation, it is strictly forbidden to allow the drill to move around its axis. If it turns at least a millimeter, it will be damaged, and you will have to grind off a small distance to re-process it.

After finishing work, the drill should cool down , also take measurements with templates. The edges must be perfectly symmetrical down to tenths of a millimeter. This is especially important if the drill has a minimum diameter.

Sharpening may be accompanied by the following errors:

• the angles will be regular and symmetrical, but the length of the cutting edges will not. In this case, the drilling center will shift relative to the axis, as a result of which beats appear. At the very beginning of work, it will be difficult to hit the markings, and the drill itself may break;
• When the angles of the cutting edge are asymmetrical to each other, the alignment is accurate. When creating holes, only one cutting part works, the work occurs very slowly and the tip heats up quickly. There may be “releasing” of the hardened metal due to heating, the hole may be broken, and the diameter will exceed the diameter of the drill.

to assemble a sharpening machine for twist drills for metal with your own hands using available materials

For the basis of the device, you can take any sharpening machine that is capable of working properly, there is no axis runout, and it maintains speed under load.

The task looks like this:

• the tool rest must stand strictly horizontally on the same axis with the rotation of the emery;
• the design must be safe, reliable and durable;
• it should be possible to sharpen both manually and semi-automatically;
• the shape of the tool rest should facilitate the free lowering of the drill shank to the desired angle.

No specific parts are required to make this device; every home craftsman has almost everything he needs. The workpieces are processed with a grinder , welding or sharpening .

For semi-automatic mode, a swing stop is assumed, so you need to make a loop connection. Accurately select the holes of the bolt, bracket and tube there are no backlashes

The platform must move along a vertical axis so that you can change the sharpening angle of the drill. This axis can be fixed, and the tool rest should swing, while resting on the horizontal axis, which, when sharpening, provides the necessary articulation.

The base plate is made of metal 4 mm thick, and the main parts of the structure should have a thickness of 3 mm respectively. This ensures its high strength. The tool rest is rigidly connected to the emery body. It cannot be attached to the protective casing, so screw the bracket using the metal “cheek”.

Then we screw the guide plate itself for drills with a thickness of 5 mm to the support plate. A triangular groove is sawn into it to secure the drill during processing .

The design has a rotation angle of 90 degrees, which allows sharpening using different methods . Starting from the Leontiev method and ending with pressing at a certain angle and creating an acute angle of the edge due to the curvature of the sandpaper.

During processing, the drill will not only stand firmly in the groove , it can also be fed along the groove to the abrasive, and the sharpening angle will not deviate. Due to the partial excess of the plane of the support plate above the axis of movement of the disk, it is possible to achieve the desired shape of sharpening the back of the edge.

Before performing work, the drill should be pressed against the plate and the cutting edge should be aligned parallel to it. The adjustment is now complete and you can bring the tool to the sandpaper. Sharpening must be done slowly and carefully, carefully monitoring the angle.

Thanks to this homemade tool, high sharpening accuracy and there is virtually no need for a template. True, it will take time to install the machine and adjust the angle, but then you can easily quickly sharpen the drills in the required quantity.

But if you need to sharpen a drill equipped with a carbide attachment, you can attach a swinging plate to a fixed angle. To do this, place several washers under the axle nut.

Using an emery wheel in a homemade sharpening tool

For universal sharpening work, white wheels based on electrocorundum are mainly used. They are used for sharpening shovels, axes, knives and metal workpieces.

For the purpose of processing carbide drills or high-speed metals, you need to take abrasive green wheels based on silicon carbide marked 64C. But for household needs, a wheel grit of 25N is sufficient.

Sharpening drills requires a finer fraction in the range from 8H to 16H . Remember that silicon carbide-based abrasives get very hot during operation, so the drill cannot be kept in contact with such abrasive for a long time. Let the metal cool down after 2-3 approaches and cool it in soda water.

The quality of the edge depends on the direction of rotation of the abrasive . Its working surface must run over the cut (go from top to bottom).

The peripheral surface of the emery must be smooth during processing. It can be adjusted with a CBN-based nozzle. If the disk has a small diameter, it is permissible to use pliers in which the CBN cutter will be held.

So, we looked at how at home you can assemble and use devices of varying complexity for sharpening drills and more. You can choose the appropriate option depending on your household needs.

Homemade machine for sharpening drills

Source: https://instrument.guru/osnastka/chertezhi-prisposobleniya-dlya-zatochki-sverl-svoimi-rukami.html

Sharpening a metal drill with your own hands. fixture and video – Tool Master

Metal drills are always hardened, but the products may become dull over time. Naturally, this is not a reason to throw them away. If you wish, you can sharpen the drill yourself using professional equipment or homemade devices.

Main types of sharpening

Experienced craftsmen know that sharpening a drill for metal varies depending on the diameter and specific application .

• Single-plane sharpening is designed for drills with a maximum diameter of 3 mm. During the work process, it is possible that the edges may “paint”, so you need to be very careful. To properly sharpen the product, it should be applied to the circle and moved parallel to the surface.
• The conical procedure is intended for larger metal cutting tools. In this case, the tool must be held with both hands, performing sequential sharpening.
• Finishing is carried out after finishing sharpening. Thanks to this procedure, it is possible to polish the cutting edge and eliminate even the smallest nicks.

Types of sharpening machines

To sharpen a drill with your own hands correctly, you need to use the appropriate machines. Such devices are divided into 2 groups .

• Industrial equipment has significant power. It can be used to sharpen drills with a diameter of 20 mm or more. These machines are installed at large enterprises, and sharpening is carried out in semi-automatic or fully automatic mode.
• Household machines are designed for use at home. They are also used in small production. Such equipment is characterized by mobility, average power and compact size.

Recommendations for choosing a household machine

If you are interested in the question of how to sharpen a drill for metal, then be sure to purchase the appropriate machine. An inexpensive model with average power is suitable for home use. It will allow you to sharpen small drills for metal.

Naturally, when purchasing, you need to pay attention to the noise level , as well as the design of the model. The best option would be a simple machine, because choosing the necessary parts for it will not be difficult.

It is necessary to buy such devices only in specialized places, since a technical passport is included in the kit. Moreover, you will be given a warranty card.

Using machines at home

As mentioned earlier, it is advisable to use household machines at home. With their help, it is possible to sharpen various types of drills. It is important to remember that for some varieties you will have to purchase the appropriate circles.

To sharpen a drill yourself, you should give preference to a machine equipped with a universal chuck. It allows you to clamp elements of various diameters.

Often included are:

The most popular equipment is from Drill Doctor and GS. Similar products are designed for sharpening drills with a diameter of 2–13 mm and 14–34 mm. Unfortunately, this equipment does not allow sharpening very thin drills. For this purpose you will have to purchase a special machine.

All equipment designed for sharpening drills at home has a number of advantages:

• possibility of working from the mains;
• high performance;
• ease of use;
• functionality;
• sharpening accuracy;
• affordable price;
• compact dimensions;
• light weight;
• convenient control system, thanks to which you can adjust the intensity of sharpening and its speed.

Homemade sharpening devices

If you do not have the appropriate machine, you can sharpen it using other devices. We are talking about an electric drill or homemade equipment created according to a drawing . It's best to give preference to the second option, otherwise you may ruin a lot of drills before you master proper sharpening.

You can even create a suitable device with your own hands from wood. So, a beam with holes corresponding to the diameter of the drills is fixed on a horizontal surface. The holes mentioned above are made at a slight angle to obtain the required sharpening angle.

Some craftsmen prefer an electric drill equipped with appropriate attachments. Naturally, the range of such elements is small , which complicates sharpening with your own hands. As a rule, a stone and a leash are included with the nozzles. If you plan to sharpen drill bits using a specific drill, you should immediately shorten the driver.

If you wish, you can make a similar attachment for a drill yourself, following the recommendations given in the corresponding video. Such devices must be equipped with fasteners for fixing the drill.

Features of the sharpening process

If this is your first time deciding to sharpen a part with your own hands, do the work in strict sequence .

1. The back surface is treated first. So, press the drill tightly and constantly make sure that the sharpening angle remains the same. As a result of processing, the tip of the drill will resemble a regular cone.
2. Next comes the turn of the cutting part.
3. The last stage involves finishing the back surface. In this case, you must make sure that the size of the jumper is no more than 0.4 mm. Naturally, for a large metal drill, this parameter should be slightly larger.

If something doesn't work out right the first time, don't despair. It's best to start practicing with tools that you're unlikely to need. The main thing is to learn how to apply pressure correctly and maintain the angle. In this case, it is necessary to take into account the fact that the side parts of the drill, and not the tip, are responsible for drilling. Accordingly, the edges must be sharpened.

It is important to remember that the sharpening process produces small particles . Due to heating, they fly away in the form of sparks. It is for this reason that safety precautions must be followed. We are talking about using safety glasses and gloves. Also, when sharpening, you should make sure that the drill is securely fixed. Otherwise, it may accidentally fall out of your hands.

Recommendations for using the machine

If you decide to use an appropriate machine for sharpening, be sure to prepare your work area. In particular, we are talking about good lighting. You should also wear protective gloves and goggles .

• First of all, you should decide on the required sharpening angle.
• It is important to position yourself so that the grinding wheel is on the right.
• Alignment must be performed. To do this, take the working surface with your thumb and forefinger, and the second hand holds the tail edge.
• The metal drill must be rotated so that the cutting edge is parallel.
• An important point is the elimination of nicks.
• All movements should be performed in a certain sequence. So, the left hand is moved down to the left, and the right hand is moved clockwise.

To properly sharpen a drill with your own hands, you need to use a suitable device . This can be a household or industrial machine, as well as an electric drill with a special attachment. If you haven't tried sharpening a drill before, check out the corresponding video first.

Source: https://cs-important.ru/tehnika/zatochka-sverla-po-metallu-svoimi-rukami-prisposoblenie-i-video.html

DIY drill sharpening machine

In order to hang a shelf, picture, mirror, towel holder, or any other similar thing on the wall, you must first drill a hole in it for the fasteners. This is done with the help of a drill - an indispensable tool in the “arsenal” of both a repairman and an ordinary thrifty owner.

However, over time, due to frequent use, the sharpness of the drill is lost, and working with it becomes worse. In order not to throw it away and not spend money on buying it, you can sharpen the old one with your own hands. For this you can use either a hand tool or a machine for sharpening drills.

About types of machines

Conventionally, according to capabilities and tasks, all units can be divided into 2 categories :

1. Household. Compact, low-power models that take up little space. Suitable for sharpening small diameter drills (up to 20 mm).

2. Industrial. More powerful and larger installations. Allows you to work with drills with a diameter exceeding 20 mm. Relevant for workshops or workshops where drills are used frequently and extensively.

The advantages of such devices include the fact that they can be used to sharpen drills at the desired angle. It is much more difficult to carry out such a procedure manually. If you use a non-specialized machine for work, you will not be able to achieve ideal angle accuracy (which is especially important when working frequently, or when working with hard materials).

Machines can also be divided according to the processing method:

1. Universal. Allows you to work with various types of tools (taps, countersinks, cutters, and so on).

2. Specialized. A machine for sharpening drills falls precisely into this category, since it can only process drills.

Due to the narrow profile of work, the use of such a unit allows you to achieve a more accurate result.

Sharpening a drill on a machine

For small workshops (including garages), it will be enough to choose a machine with a universal chuck. Ideally, if there is more than 1 cartridge: some machine models are equipped with several cartridges that can be changed.

to menu

Differences in sharpening method

There are 7 different ways to sharpen drills :

• complex-screw;
• screw;
• shaped;
• elliptical;
• conical;
• single-plane;
• biplane.

If sharpening is carried out on universal machines, only 4 methods can be used:

• single-plane;
• two-plane;
• shaped;
• elliptical.

Sharpening a drill on a machine

The remaining 3 methods can only be used on specialized machine models.

to menu

What are the dangers of making a mistake when sharpening?

If a mistake is made when sharpening a drill (often happens when the work is done with a hand tool), the following problems are possible:

• the cutting edges will have different lengths;
• there will be different angles between the cutting edges and the axis of the drill;
• the transverse blade will have a one-sided groove.

As a result, the following problems will arise during drilling:

• the drill may break (due to the cutting edges receiving the wrong load);
• the holes will be larger in diameter than the diameter of the drill;
• the drill may hit.

to menu

How to choose a model?

To decide which drill sharpening machine to buy, you need to pay attention to the following nuances :

1. Work front. You need to decide exactly what exactly the machine will be used for and how often. Depending on this, choose a simpler one (if the machine is used for rare sharpening that does not require perfect accuracy), or vice versa, a higher quality model (if the drills have to be sharpened often).

2. Power consumption. You need to pay attention to this point if you plan to use the machine frequently. If the device is taken for periodic work, this issue is not too important.

3. Drill diameter One of the main parameters worthy of attention. If you plan to work with a precisely known range, it is not necessary to take a machine with a large margin (since they consume more electricity).

4. Noise level. If the device is planned to be used in a residential area or nearby, it is recommended to choose low-power models.

5. Simplicity of the device. The simpler the machine, the easier, cheaper and faster it is to repair, and vice versa. In addition, for many foreign models (especially little-known ones), difficulties may arise with both parts and repairs in general (since not every master will undertake to repair unfamiliar instruments).

   data-ad-client=»ca-pub-8514915293567855″
   data-ad-slot=»5929285318″>

6. What exactly will be sharpened (regular drills, engravers, cutters).

to menu

Briefly about the models

all about the Proxxon machine range.

For your reference, here are a few specific models that can often be found in stores of similar equipment:

Drill Doctor machine for drills

1. Machine for sharpening drills Caliber EZS, 200C. A simple household model, suitable for a “garage” workshop.

2. Proxxon BSG 60. A universal model that is between household and industrial. Having compact dimensions, it allows you to work with drills with a diameter from 3 to 40 mm.

3. Proxxon BSG 220. A simplified version of the BSG 60 model. Works with drills from 3 to 13 mm. Takes up little space (dimensions - 290x200x110 mm), ideal for “garage” workshops.

Source: https://ostanke.ru/zatochky/sverl.html

How to sharpen drills: do-it-yourself drill sharpening machine - Turner Master

» Machine » Machine for sharpening drills with your own hands drawings

In principle, you can bring a dull tool into proper condition manually. But how high will the speed and accuracy be with such technology? In addition, if the drill is carbide, this is quite difficult to do. The author suggests assembling a machine for sharpening drills with your own hands, which will allow you to use them many times.

Industrial equipment is quite expensive - from 43,900 rubles.

True, Chinese products (for example, “GQ-D13”) can be bought for 6,800 – 7,200.

But it is unlikely that such cheap models will suit the home craftsman, given that the body is made of plastic, and the motor power is in the range of 80 - 120 W.

In addition, they can only sharpen certain types of drills, so there is no need to talk about universal use. Therefore, such machines do not count.

The feasibility of making a “sharpener” with your own hands for domestic use is more than obvious.

This article does not discuss options for making a sharpening machine based on an angle grinder (not every home has a grinder, and hardly anyone will buy it just for these purposes) or an electric drill (for which you will have to look for special accessories in stores). The simplest and most convenient option is a traditional “sharpener” made from scrap materials, which almost all of us have encountered, and more than once.

There is nothing complicated in the design of such a machine. However, there are a number of features in assembling it yourself, and this is what the author draws attention to. Having dealt with all the nuances, making an installation for “home” use will not be difficult (the entire process of sharpening a drill is discussed here).

Electric/motor

Various drills, including large diameter ones, are sharpened on the machine in everyday life. In addition, the primary processing of the cutting edges of the tool and their finishing are separate stages of work. Therefore, you will have to change the circle and install the one that is at hand from those purchased in advance. Since the machine is long-term equipment, it is necessary to install it for the future. Based on this:

• engine power: about 1.2 - 1.5 kW is sufficient;
• power: single-phase. Any garage or small workshop (shed) on the site, with rare exceptions, is connected to the 1ph 220/50 line. This is what we need to proceed from.

Grinding wheel

Moreover, there should be several of them, with different grain sizes. To securely fix the abrasive on the engine shaft, bushings are prepared that clamp it on both sides.

Sharpening device

You can limit yourself to the simplest “shelf”, but then you will not be able to maintain the required angle. This type of work requires a lot of practical experience.

The device can be purchased, although it is quite rare on sale.

The best option is to make it yourself. For example, like this:

Schematic elements

• Magnetic starter (with 3 pairs of contacts) for a 3-phase circuit.
• Start/stop button or 2 different ones - to turn the machine on and off. And the third one is definitely an emergency stop. It is often combined with a pedal, which is much more convenient and safer, since your hands will be busy when sharpening drills.
• Wires. With the indicated engine power, 1 “square” is enough.

The simplest connection diagrams for three-phase motors are shown in the figures:

It is easy to find an acceptable one on the Internet, depending on what kind of motor is used, how its windings are connected (“star” or “delta”), and what voltage source it will be connected to (1 or 3 phases).

Security elements

• The casing is over the circle.
• Screen (preferably).

Useful tips

There are certain types of work in which sharpening of drills is carried out only on machine equipment, and not manually.

• When drilling to great depths, when a slight sharpening is required.
• If the drills are universal, allowing you to work even with materials of increased density.
• For making “blind” holes with a special tool.

Sharpening drills using a grinder is not recommended for several reasons. Firstly, the angle grinder is unlikely to be securely fixed. Secondly, the accuracy will be unsatisfactory.

Thirdly, after such sharpening is completed, it is quite difficult to properly fine-tune the drill.

Fourthly, this technique is only suitable for partially restoring the functionality of a tool with a relatively small diameter (no more than 5).

If the workbench in the garage is rather flimsy, you will have to mount a special table on metal legs. A large corner, pipe or channel is suitable for this. The tabletop, taking into account the weight of the machine (primarily the engine), must be durable.

Thin sheet iron is not an option. The stand for the machine can also be made of wood, but of sufficient thickness. Its fastening also requires attention.

It must be as reliable as possible, at all points provided on the engine frame, and only on bolts.

When deciding on the engine switching circuit, you need to provide for the possibility of changing the speed. Since you will have to work with various drills, you need to know that the harder the material of the tool, the lower the angular speed of rotation of the abrasive wheel should be.

As practice shows, not all inexperienced craftsmen understand when a drill needs sharpening. Signs indicating that the tool is dull:

• grinding (sometimes “humming”) at the initial stage of drilling;
• rapid heating of the metal, often accompanied by a characteristic odor.

Untimely sharpening significantly reduces the service life of the drill and is the most common cause of its failure.

ismith.ru

Drawings of a device for sharpening drills with your own hands

If you constantly deal with sharpening hard workpieces, the surface of the drill will very quickly become unusable. It will become dull, become very hot and eventually lose its former strength. All this is a consequence of “letting go” of the metal. That is why such a tool needs periodic sharpening using special devices.

How to make homemade devices for sharpening drills, what templates exist for this and what you need to prepare for work, you will learn from our article.

Source: https://tokarmaster.ru/drugoe/kak-vypolnit-zatochku-svyorl-zatochnoj-stanok-dlya-svyorl-svoimi-rukami.html

Do-it-yourself drill sharpening machine - how to make a device

When drilling holes in parts made of metal, the tool used is subject to active wear, which leads to intense heating of the drills and, as a consequence, to their failure.

To avoid this, it is necessary to regularly restore their geometric parameters, and a special device for sharpening drills helps to do this as accurately and efficiently as possible.

This simple device, which you can make yourself, allows you to quickly and efficiently sharpen dull drills and not spend money on purchasing new ones.

Sharpening a drill on a homemade device

A device designed for sharpening drills is especially relevant in cases where these tools often have to be used on metal, as a result of which they quickly wear out and require regular restoration.

When processing wood, the drill used for these purposes practically does not wear out and, accordingly, requires minimal attention to the parameters of its sharpening.

For drills, the cutting part of which is equipped with carbide inserts, such a device is also not particularly significant, since they are practically not subject to regrinding and are used by craftsmen until they are completely worn out or broken.

Many experienced specialists do not use sharpening devices at all, completely relying on their experience and eye. However, as practice shows, in such cases it is better to use devices that allow you to mechanize this process. This will ensure maximum accuracy and the required quality of the result.

Metalworking machines are required for the manufacture of high-precision fixtures

The modern market offers many devices for sharpening drills that allow you to quickly, efficiently and accurately restore the geometry of the cutting tool, even if you have no experience in performing such procedures. Meanwhile, you can not spend money on purchasing such devices, but make a simple machine for sharpening drills with your own hands.

Manufacturing options

Whatever device or machine is used to sharpen a drill for metal, its quality must be controlled. For this, a special template is used, which can also be serial or made by hand.

This template is necessary primarily to control the accuracy of the angles of the cutting part, which are formed during the process of sharpening the drill. The tools used to work with different materials differ from each other, including the magnitude of such angles.

You can find out the exact values ​​of the latter from the reference table.

Table 1. Drill sharpening angles

Working with different materials and knowing the angles of the cutting part of drills for such materials, you can make several templates at once and use them to control the correct sharpening of the same drill, which in this case acts as a universal tool.

As the simplest device for sharpening drills, you can use a sleeve with an internal diameter corresponding to the transverse size of the drill, rigidly fixed to a reliable base at a certain angle.

When selecting a sleeve for such a device, you must ensure that the diameter of its internal hole strictly corresponds to the transverse size of the drill being sharpened.

The tool being processed should not be allowed to dangle in such a hole, since even a 1–2° deviation of its axis from the required value can seriously reduce the quality and accuracy of the sharpening performed.

Drill sharpening device

It is better to immediately equip a homemade device for sharpening drills with a holder made of copper or aluminum tubes, the internal diameters of which correspond to the standard sizes of the drills you most often use.

You can do it simpler and supplement such a device used for sharpening drills with a wooden block. Holes must be drilled in the block corresponding to the sizes of tools of various diameters.

The most important design element of such a device is the tool rest, which simultaneously solves several important problems:

• ensures correct fixation of the drill and its precise movement in relation to the surface of the grinding wheel;
• acts as a reliable support for the tool being processed.

Diagram of the simplest device made from a wooden block

A similar device based on an oak block with holes of different diameters was used by our grandfathers, who used it to sharpen drills with high quality and precision. The main task that a homemade machine or device used for sharpening drills must solve is to correctly orient the cutting part of the drill being processed in relation to the working surface of the grinding wheel.

To make a homemade machine for sharpening drills, you can use various designs of such devices. The corresponding drawings are easy to find on the Internet. Moreover, if you understand the operating principle of such a device, then you can make your own sharpening machine according to your own design.

Quite a serious device that provides good sharpening accuracy

Drawings of fixture parts

Promopore Promopore platform Movable platform Drill fastening and thrust screw Rotary platform Bolts, nuts, pins and washers

There is an important rule that must be observed when working with such a device: during its use, the drill being sharpened should not rotate around its axis. If the tool rotates even at a small angle, sharpening will have to be done again.

After sharpening the drill, it should be allowed to cool. Then you need to check its restored geometric parameters using a template. It must be borne in mind that the cutting edges of the tool may differ from each other in length by no more than tenths of a millimeter. It is especially important to comply with this requirement for drills with a small diameter.

Among the mistakes made when sharpening drills using such a device, two of the most typical ones stand out.

1. The length of the cutting edges, even with their symmetry and correctly selected angles, is not the same; accordingly, the drilling center is shifted relative to the tool axis. A drill that was sharpened with such an error will create a strong runout during the drilling process, and it will be quite difficult to get it into the center of the future hole on the surface of the workpiece. A tool sharpened in this way is highly likely to break during further use.
2. When the drill is accurately centered, the angles at which its cutting edges are located are asymmetrical. Since this causes only one cutting edge to work, drilling will occur slowly, while the tip of the tool will actively heat up. This will lead to the tempering of the metal from which the drill is made, and the hole created will be broken (will have a diameter greater than the transverse size of the tool itself).

How to make a machine for sharpening twist drills

As a basis for the manufacture of a sharpening machine for spiral-type drills, you can use any serial sharpening unit that can operate without runout and withstand significant loads. When equipping such a machine with additional devices, the following requirements must be met.

• The axis of the tool rest must coincide with the axis of rotation of the grinding wheel, and it can be located with it in the same horizontal plane or be higher than it.
• All elements of the structure being created must be securely fixed to ensure the safety of sharpening work.
• The design of the device must allow sharpening of drills both manually and semi-automatically.
• The device of the tool rest should allow the drill shank to be positioned at any angle.

Assembly for sharpening drills

The manufacture of this device for sharpening drills does not require complex technical devices and scarce materials, which will have to be purchased additionally. All components can be found in almost any home workshop or garage. As equipment and tools with which such components will be modified before assembling the device, you can use a regular grinder and a welding machine.

Since the stop of such a device must be oscillating, which is necessary for sharpening drills in a semi-automatic mode, a loop connection should be used to fix it. When selecting a tube, bracket and bolt for the fastening unit, you should keep in mind that there should be no play in the device. The homemade product of the proposed design has two degrees of freedom.

Fixture details

The platform of such a device, on which the drill being processed is fixed, has the ability to rotate along a vertical axis, making it possible to change the sharpening angle of the tool. In addition, the tool rest, resting on a horizontal axis, can make oscillatory movements, which ensures correct articulation during sharpening.

To manufacture the structural elements of such a device, sheet metal of various thicknesses is used, namely:

• support plate – 4 mm;
• drill guide plate – 5 mm;
• other structural elements - 3 mm.

The tool rest, on the top of which the support plate is installed, must be securely fixed to the body of the sharpening machine. For this, an additional metal “cheek” is used, connected to the device bracket.

The guide plate, on the surface of which it is necessary to make a triangular groove designed to accommodate the tool being processed, is fixed on the support plate using a screw connection.

Plate guide groove

The design and design features of the drill sharpening device in question allow it to rotate at an angle of up to 90°. Thanks to this ability, you can sharpen drills using this device using almost any of the methods used today.

The drill, sharpened using such a device, fits into the guide groove and can move freely in it in the longitudinal direction. In this case, the sharpening angle of the tool does not change.

Installing the drill into the guide groove of the plate

Since the upper surface of the support plate is located slightly above the axis of rotation of the grinding wheel, when using such a device, the optimal sharpening shape of the back surface of the drill is achieved.

The process of sharpening drills using such a device is as follows.

• The tool is positioned in the guide groove of the fixture so that its cutting edge is parallel to the edge of the guide plate.
• After adjusting the position, the drill is slowly fed to the working surface of the rotating grinding wheel.

The process of working with such a device is well demonstrated in a video that is easy to find on the Internet.

Despite the simplicity of the design, such a device ensures high accuracy of sharpening, for quality control of which you don’t even need to use a template. If you fix the swing plate of this device at a fixed angle, it can also be used for sharpening drills equipped with carbide inserts.

Several recommendations for choosing sanding wheels

In order to successfully sharpen metal drills, most of which are made of high-speed steel, it is necessary to use a sufficiently hard sharpening wheel. For this purpose, you can use an abrasive tool made of silicon carbide.

Such wheels, which can be identified by their green color and marking 64C, should have a grain size in the range of 8H - 16H. When using discs made of this material, you must keep in mind that they become very hot during operation, so you should not allow the drill to be sharpened to be in prolonged contact with the abrasive tool.

To prevent overheating of the drill when sharpening it on such a disk, the tool must be regularly cooled using an aqueous solution of soda.

When sharpening drills using a grinding wheel, it is very important to ensure that the working surface of the abrasive tool runs over the drill being processed, that is, moves from top to bottom, and not vice versa.

Source: https://derevyannie-doma.com/materialy/stanok-dlya-zatochki-sverl-svoimi-rukami-kak-sdelat-ustroystvo.html