How to sharpen drills with the correct sharpening angle without much effort and skill? Unfortunately, many of us do not succeed the first time. This device is very simple in design. Therefore, each of you will be able to repeat it. Many people know that the edges of bolts and nuts have the same angle as a standard drill sharpening. We will use this. We will not weld two nuts together to get the correct pattern. The design is a little different.
To start, you need any nut. The larger the diameter, the larger the diameter of the drill that can be sharpened in it.
The nut has 6 faces, 2 of which we need. Take a caliper and mark 4 mm from the edge of the nut. We turn the nut the other way around and make a mark on the edge that is one and a half mm larger than the first one. We make a triangle on 2 sides. Cut with a hacksaw or grinder. The result was a nut with cuts.
We weld another one. The device is almost ready. He misses the puck, which we throw into the middle. You will also need a bolt; it screws into a small nut.
The cuts in the nut have different depths, which differ by 1.5 mm. This difference is hardly noticeable to the eye. We insert the rod, fix it, and apply a ruler. The gap between the ruler and the round timber is smaller on the left than on the right. That is, the device has a certain angle. Where the gap is smaller, the master made a mark.
Operation of the device mechanism
We take a straight, unsharpened drill and place it in the device. Where the mark is, the drill must be placed, as shown in the photo and video. We fix the drill so that it protrudes slightly from the edges. The drill will be sharpened on the working side. In the example shown, it is possible to clamp with a diameter of up to 8 mm.
When we start grinding the edge of the drill using sandpaper, there is a guide in the form of the plane of the edge of the nut, which sets the correct sharpening angle.
This is a great device for those who cannot find the right angle by eye.
The video shows how to position the tool relative to the sanding wheel. From the 6th minute you can see how the drill is processed.
Alexander Polulyakh.
In addition to this video tutorial, another DIY device using bolts and nuts.
Drawing
https://drive.google.com/file/d/0B8iB5ht2WrqOMEJiZlRtZ2VWdVE/view
How to make a device for sharpening drills. Device for manual sharpening twist drills Some time ago, I accidentally came across (meaning the author of the article, see source) on the Internet some very useful video tutorials by V. Leontyev on manual sharpening of twist drills:
But then an idea arose on how to make sharpening drills even simpler and more convenient. As a result of thought and experimentation, the device described below appeared. First, it was necessary to modernize - to bring to mind the existing factory-made Chinese (like German) sharpener. Because it was almost impossible to work with him using V. Leontiev’s techniques.
Electric sharpener made in China.
Flimsy standard support bracket.
The design of the tool rest is unsuitable for work.
Firstly, the bracket for attaching the hand rest to the disc casing is too flimsy, made of metal 2 mm thick. It bends with a little effort. Therefore, naturally, the sharpening angles are +/- kilometer! And the shape of the tool rest absolutely does not allow making a normal back angle according to V. Leontiev’s method, since the drill, when lowering the shank, rests against the corner of the bracket. Moreover, the hand rest itself is installed BELOW the axis of the disk. That is, there is no way to get a normal clearance angle at all, unless you use the end surface of the disk.
The plane of the tool rest is much lower than the axis of rotation of the disk.
New support bracket.
For a normal bracket, a piece of metal 4 mm thick was used, bigger size and additional mounting screws. The old bracket was secured with two rivets that had to be cut off. Now the new bracket is much stiffer than before. Also, a horizontal shelf of the tool rest with additional mounting holes was welded from pieces of angle and strip. Its position can be adjusted within certain limits.
Comparison of metal thickness in new and old tool rests.
The new bracket is attached at 5 points.
Device details. Bracket. Handyman. Rotating plate...
Next, the device itself was manufactured. It is a rotating plate with a welded bushing, which can swing on an axis fixed in the eye, which in turn is attached to the tool rest. A guide plate for drills, in which a triangular groove is selected, is attached to the rotating plate on top.
The device is assembled. The plate is in a horizontal position.
The device is assembled.
Sharpening device.
At first, instead of this plate, a guide in the form of a piece of a corner was tested (as in V. Leontiev’s video), but this option is not suitable at all - the drill is difficult to fix properly (it tries to run to the right when it touches the disk), especially since it is also required push forward when forming the rear corner. In general, the corner (it is in the photo) is completely unsuitable.
The device is in the down position.
Working with the device resembles the movements of the author of the video tutorials, only instead of a finger and an eye, the swing axis and the set sharpening angle of the drill are used. It is much more convenient with the device to control the parallelism of the drill cutting edge being processed to the disk. You just need to turn the plate down and press the drill into the groove so that the line of the cutting edge is parallel to the plane of the plate - the axis of swing of the plate. This moment is shown in the photo.
Installing the drill on the tool rest to the whetstone.
First, the edge itself is formed. When processing the rear corner, it is necessary to simultaneously lower the plate down and move the drill itself forward towards the disk. You must try to prevent the drill from rotating around its axis when shaping the edge and processing the back corner. I control the symmetry of the edges in the same way as in the video tutorials. By the way, instead of a swinging plate, you can install a piece of an angle with fixed sharpening and back angles on the tool rest - this is for sharpening carbide drills. You just need to determine the location required length sides of the angle to obtain the desired rear sharpening angle, since it depends on the diameter of the disk and the location of the tool rest relative to the axis of rotation of the disk.
Installing the drill into the guide groove of the plate.
Control of drill installation. The cutting edge of the drill is parallel to the surface of the insert.
Guide groove configuration.
Device for manual sharpening of twist drills.
Metal drills are hardened during production, but gradually they still become dull. Of course, you shouldn't throw them away right away. You can sharpen a metal drill yourself using special equipment.
Types of sharpening devices
To properly sharpen a drill, you need to use special devices. They are divided into two categories:
- industrial equipment. Has great power. Using it, it is possible to sharpen drills with a radius of one centimeter. These devices are installed in large enterprises. Sharpening is performed semi-automatically/automatically;
- household equipment. Intended for use at home. In addition, it is used in small enterprises. This equipment is mobile, compact, and has standard power.
When purchasing a machine, you need to take into account the noise level, design features device. It is optimal to buy a regular machine, because it is easy to find suitable spare parts for it.
You only need to purchase sharpening devices in special places, because they come with a technical passport for the machine. In addition, the buyer receives a warranty card.
The use of sharpening machines at home
For home the best option are considered household machines. With them it is possible to sharpen different types drilling tools. It is worth considering that for certain types of drills you will need to buy special circles.
In order to carry out sharpening yourself, you need to choose a machine that is equipped with a universal chuck. It makes it possible to clamp parts of different sizes.
The buyer is often provided with the sharpening device:
- CBN circles;
- keys;
- collets;
- replacement parts;
- lighting fixture for the workplace.
The most common devices for sharpening drills are Drill Doctor, GS. These machines are intended for sharpening drilling tools with a radius of 0.2-3.4 cm. Such equipment is unable to sharpen extremely thin objects. To do this you will need to buy a special machine.
All equipment intended for sharpening tools at home:
- can work from the electrical network;
- highly productive;
- easy to use;
- functional;
- provides precise sharpening;
- is inexpensive;
- compact;
- weighs little;
- conveniently controlled. It is possible to change the intensity of sharpening and its speed.
How to make your own sharpening machine
First of all, you need to purchase a control device. It is required to check how accurately the work is done.
Drills designed for processing different metals require different edge angles. Below is a list of machined parts and corresponding edge angles:
- steel, cast iron, bronze – 115;
- brass, copper – 125;
- aluminum, ceramic, granite, wood – 135;
- magnesium – 85;
- silumin, plastic, textolite – 90.
Having familiarized yourself with this list, it is possible to make several templates and, accordingly, carry out sharpening with your own hands. The same drilling tool can be used for different parts. You just need to change the angle of the vertex of the workspace.
A simple but very effective device for sharpening a drill is a base on which bushings of various sizes are fixed. Remember that the object should not shake in the sleeve. The slightest deviation will lead to a significant decrease in the quality of drilling processing.
It is advisable to have a tube holder made of aluminum/copper. You can also make it in a block from soft material the required number of holes. Mount a convenient tool rest on the grinding wheel, which allows you to move the homemade device for sharpening drills, which serves as a stop element, at the required angle.
Currently, there are various drawings of sharpening devices. You can use an existing one or create your own. Do not forget that when sharpening a tool, you must not allow the drill to rotate around its own axis.
Once sharpening is complete, allow the tool to cool. Measure the accuracy of your work using a template. The edges should be symmetrical. This is especially important for small radius tools.
Using an electric drill
Some people prefer to use an electric drill, which is equipped with special attachments, as the basis for a sharpening device. Of course, the number of attachments is limited. Consequently, sharpening by hand is difficult. The set with attachments includes a stone and a leash.
If you want, you can make the nozzle yourself. This element of the sharpening device must be equipped with a fastener to secure the tool.
Features of sharpening
If you decide to sharpen the tool yourself using sharpening devices, carry out the procedure according to the following algorithm:
- Finish the rear. Press the tool firmly and make sure that the sharpening angle does not change. At the end of processing, the end of the tool will look like a cone.
- Now sharpen the cutting surface.
- At the final stage, the rear part is refined. Make sure that the jumper size does not exceed four tenths of a millimeter. Of course, for a large instrument this indicator should be a little higher.
If something doesn't work out for you, don't be upset. It is advisable to practice on drills that most likely will not be useful. The main thing is to learn the correct pressure and maintain the angle. Remember that the holes are drilled into the sides of the tool, not the tip. Therefore, the edges must be sharpened without fail.
Do not forget that when processing a drill, tiny particles appear. Due to heating, they fly in different directions. In view of this, safety rules must be observed. Use special glasses and gloves. In addition, make sure that the tool is securely fastened, otherwise it will fly out of your hands.
If you want to use a device for sharpening drills with your own hands, be sure to prepare work area. Make sure there is adequate lighting. In addition, do not forget to wear special gloves and safety glasses.
- First of all, calculate the desired sharpening angle.
- Your sharpening stand should be such that the grinding wheel is on the right side.
- Perform alignment. For this big and index fingers grab the work area and hold the tail edge with your other hand.
- The drilling tool must be rotated so that the cutting surface is parallel.
- Don't forget to remove nicks and other imperfections.
- All movements must be done in some order. Eg, left hand it is necessary to move to the bottom from the left side, and the right - clockwise.
Conclusion
Purchase industrial equipment for sharpening drills is not very rational, since it is expensive. For home needs, an ordinary household machine or a sharpening device made by you is optimal.
To avoid mistakes when sharpening a metal drill yourself, you need to use special device. This can be a household/industrial machine tool, an electric drill with a special attachment. The attachment fits directly onto the drill for sharpening drill bits. If you haven't attempted sharpening a drill bit before, watch the instructional video below.
Be sure to follow safety precautions. Ignoring simple rules, failure to wear protective clothing could land you in a hospital bed. Sparks caught in the eye are no joke. There is a high probability of losing your vision completely. Agree, it is better to simply wear special gloves and safety glasses than to expose yourself to the risk of serious injury.
On the Internet you can find a huge number of schemes for making devices with which you can sharpen drills. However, most often such schemes are very complex and the average person cannot understand them. You can, of course, try to sharpen the drills by hand sharpening machine, holding the tool at an angle of 60 degrees. However, even in this case it is very difficult to achieve perfect sharpening so that there is no displacement of the center. However, there is Alternative option is a homemade device for sharpening drills, made from door hinge. Anyone can make such a device.
Features and manufacturing process
The mechanism of operation of a homemade sharpening device is based on the rotating movement of a regular door hinge (you will need a hinge with a metal thickness of at least 3 mm). The lower part of the loop will be fixed to the tool rest, and the upper part will move the drill. In order to securely fix the lower part of the loop on the tool rest, you will need to weld a 25x25 mm corner, then drill a hole in it and cut a thread for an M6 bolt.
At the next stage of work, you need to set the correct sharpening angle of the drill, using a segment for this steel angle, which must be welded to the loop, and a regular school ruler with a protractor. To check that the angle is set correctly, use a factory-sharpened drill - it should be in contact with the entire plane of the edge of the pen. Next, you will need to weld an M8 stud to the structure with a pre-prepared clamping nut made of 4 mm thick metal. The device is ready!
You can easily make a device for sharpening a drill for metal with your own hands. This will require a little time and a few basic elements for the future design.
Devices used for sharpening drills for metal, wood, plastic and other materials are divided into two types:
- Specialized. They can only sharpen one specific type of cutting tool;
- Universal. With their help, all kinds of cutters, drills for metal, wood, etc. can be sharpened.
If we are talking about making a device with our own hands, craftsmen usually try to make a universal model. The device is easy to use and effective for sharpening drills of small and medium diameter. Ideal for household purposes.
Elements of the device
To make a sharpening device, you will need some elements and tools:
- Stand;
- Toggle switches for turning the sharpener on/off;
- Disc for grinder;
- Electric motor;
- Electrical cable to connect the device to the network;
- Plugs;
- Case material.
All the components of your drill sharpening machine will be located inside the body. This way you can increase your own safety when working with sharpening equipment.
When assembling the structure, leave the pulley from the electric motor accessible, since the sharpening disc is placed on it. It is advisable to first select a stationary location for the machine, since it should be fixed on a workbench or desktop.
The process of assembling the sharpening device itself is as follows.
- Install the electric motor in a pre-selected location.
- On the table where the device for turning metal drills will be located, mark the fasteners.
- Using an electric drill, make holes according to the markings for the mounting bolts.
- Secure the electric motor with metal clamps in its rightful place.
- Fix the casing, which will act as protection.
- Install a grinding disc on the electric motor pulley.
- The engine itself should have an extended pulley, as this will be more convenient when operating the sharpening device. Don't forget to put a washer on the pulley before installing the circle.
- If the diameter of the pulley and the circle do not match, you can use an adapter sleeve. A threaded hole is drilled on the side of the bushing, onto which an auxiliary fastening bolt is then mounted.
- There is no need to choose an engine that is too powerful. High speeds will only harm your metal drills. Most craftsmen adapt an engine removed from old washing machines to a grinding unit.
- After completing the assembly, connect the toggle switches, connect the motor and all electrics via cable to the outlet.
Assistive devices
If you managed to assemble with your own hands a fairly useful sharpening device for various drills for metal, wood or plastic, we advise you not to stop there.
There are a few additional elements, equipping the sharpening device with which you will significantly expand its functionality and increase your level of comfort when working on drills.
- Test template. To determine correct angles When sharpening a drill, you will need a special table or template. The template will always be at hand. With its help, you will determine how correctly the sharpening angles are made, what is the duration of the working edges, and what are the angles between the bridges and the working edges. Templates are made from thin, soft metal on the base of a new drill before its first use;
- Guides. A kind of small attachments made from metal strips. They are bolted to the body of the sharpening device. When working, you will need to place the drill on these guides, gradually bringing the tool to be sharpened to the abrasive stone;
- Goniometers. The easiest option is to take a regular metal protractor, cut off part of the device and attach it to a stand. Cut off the part of the protractor where the scale is more than 30 degrees. This is due to the fact that drills are not sharpened at a smaller angle.
Multitasking device
If you make such a device, the accuracy and convenience of sharpening metal drills will increase significantly. At the same time, assembling the structure is quite simple. To make the mechanism, arm yourself with the following components:
- Roller slides;
- Guides;
- Shaft;
- Protractor;
- Drill chuck.
- It is recommended to make the guide wide and attach a protractor to it.
- The role of the rotary axis will be a bolt, which is inserted into a pre-calibrated hole.
- On the rotating part there is a guide and a movable metal plate.
- An axis and tube are mounted on the surface of the plate.
- One end of the axle is used to install the drill chuck, and the other is used under the handle.
- The thrust plate will move due to the threaded axis.
- At the bottom of the plate there is a limiter. It performs two functions at the same time - it fixes the mechanism in the required position and indicates the desired angle.
The device operation process looks like this:
- The cutting drill is installed in the chuck;
- The plate is fixed in the required position to create a sharpening angle;
- The device rotates along the longitudinal axis with a handle;
- The angle is marked;
- The cutter is turned 90 degrees, after which the second half of the metal drill is processed with your own hands.
Operating rules
Because the we're talking about When working with a homemade drill sharpener, you must follow some rules. They will protect you from injury and also allow you to sharpen the drills correctly.
- When sharpening drills, make sure that the hangers are the same. This will ensure that the drill fits neatly and evenly into the device and, after sharpening, will be able to drill holes efficiently.
- Before starting the machine, make sure that the sharpening disc is firmly secured to the electric motor pulley.
- The first stage of drill sharpening is performed with a coarse abrasive sharpening disc. When burrs begin to appear on the metal drill, change the sharpening disc to a more delicate one to complete the sharpening.
- When sharpening with your own hands, strictly adhere to the specified angle.
- Rotation grinding wheel must be carried out strictly in the direction of the blade. If you move in the opposite direction, you will not be able to complete the job properly.
- Make sure that the drill does not overheat while sharpening. Stop periodically and let the metal drill cool down. But under no circumstances cool it by lowering it into cold water, because this will cause the metal to lose its strength.
Watch visual videos about assembling sharpening devices. Be sure to take into account the diameter of the cutters that you will sharpen on the machine, so that the assembled mechanism will ensure high-quality and efficient processing of products.
