In the arsenal of any master there is a set of tools that can be useful for solving a wide variety of household repair problems. These include a set of screwdrivers, an electric drill with a set of drills, a hammer. At the same time it is necessary that the nozzles for screwdrivers are universal, that is, fit any type of screw or bolt. The same applies to drills. The standard set includes drills that can be useful for working with various materials, for example, wood, concrete, metal.
The main parts of the drill.
And over time, these consumables are dulled and can not perform their functions in the required amount. Each type of drill has features in sharpening. Some of them can be sharpened only with the use of complex units and equipment. But with such a process, how to sharpen the drill on the tree, you can cope on your own at home. This requires patience and some simple skills.
Independent drill selection
When choosing and buying drills for a drill, first of all you need to carefully inspect the tool for cracks and other external damage. These defects must be completely absent. By the color of the drill you can determine how the final processing was carried out. The strength and other performance characteristics of the tool depend on it. If the drill is black, it is treated with high temperature steam, which increases strength.
The position of the drill when grinding on the grinding wheel.
With a golden yellow color, the drill was processed to relieve stress. When processing a drill with titanium nitride, the drill acquires a bright yellow color. After titanium spraying, the period of validity increases significantly. The drill, which is not exposed to any processing, has dark gray color.
Most often complete with a drill attached drill bits in a set. It can include tools of various lengths, diameters, and also processing methods.
Drills in their application can be divided into:
- for woodworking;
- for concrete structures;
- for metal parts.
Each species may differ in appearance and color. But there are also subtleties. So, for example, to drill wood drills can be made in the form of a spiral, serpentine, pen version.
Device for sharpening drills.
The spiral drill is 3–52 mm in diameter. A feature of this tool is that a double ribbon can provide accurate guidance over the hole, regardless of depth, eliminating its slippage. The chips are removed in a timely manner, the helix does not clog. With the help of it, they drill holes for dowels in monolithic wooden plates of various types of wood, thick plywood sheets, and also soft wood.
Threaded tip, slotter and hex shank are features of the serpentine drill. The spiral is carefully ground and milled. It is used for the execution of holes in the plates, which are veneered.
Drill with a feather tip can be used for domestic purposes for various wood species. It is very convenient to remove it from the drill retainer, if you need to make a lot of holes of different diameters. With it you can drill hard or soft wood.
Sharpening and checking drills.
The quality of the hole will directly depend on how right the element is chosen. The drill kit must have a long piece to drill through a thick tree. It is very important to consider the size of the electric drill. With a length of 45 cm and a diameter of 10 mm, it has sufficient weight and when working at high speeds with an ordinary drill, you can experience discomfort. Therefore, to work with such a drill, it is better to use a drill mixer, which has low revolutions.
Screw drill can provide wood work against fibers. Their diameters can be 10-50 mm, length 400-1100 mm. The longer the drill has, the longer it should be threaded. She will provide a simple conclusion of shaving in the course of work.
Back to table of contents
Types of sharpening drills.
As an alternative to a long threaded drill bit, you can use pen drills with an extension to make the necessary holes. But this type of drill has a significant drawback: with a large hole length, it is difficult to draw chips. This extension has a hexagonal shape, it can be used for other types of drills. The diameter of the hole, which will be the result may be 10-52 mm.
For woodworking, in addition to these types (spiral, serpentine, pen version), ring drills are also used. This is a specific type of drill that is most often used for holes in furniture parts. In addition, using such drills, one can drill holes of sufficiently large diameter that none of the other types are capable of doing. The drill itself looks like a ring with teeth. Such drills are sold in a set, among which there are nozzles and a basis for their fastening.Back to table of contents
Correct drill sharpening
Stages sharpening drill.
When the product is dull, the question arises, where to sharpen the drill. Sharpening yourself is possible, only this requires certain skills. If there are none, then for their purchase it is possible to begin to sharpen the elements that are rather old, which can be thrown away if they fail. After all, if you do not follow the technique of sharpening, then the further use of the product is impossible, as well as restore it. Especially well give in to sharpening in house conditions of a drill which are intended for work on a tree. This is due to the peculiarity of the execution of this tool, as they are made of softer steel. Then the place where to sharpen the drill will be the home workshop.
For sharpening, a sharpening machine is needed, to which water must be constantly supplied.
Patterns to control sharpening.
The jet of water will prevent overheating of the metal of the drill when working. If it is not at home, then you can use the file. But processing the drill manually will take a long time and patience.
When performing sharpening, it is necessary to observe very clearly the initial geometrical dimensions and not to disturb the configuration features of the tool. Namely, the degree of its preliminary sharpening, which was performed during production.
If the machine is used for sharpening (sharpening), then the process itself is performed by the edge of the grinding disc. To comply with the required accuracy of geometrical values, you can use a special additional tool. The drill is inserted into it and clamped. This will facilitate the work of sharpening and save hands from possible burns from excessively heated drills. To avoid damage to hands, it is recommended to use gloves during work. After the pre-sharpening has been completed, it is necessary to bring the cutting edge to perfect condition. This can be done on the same machine, but reducing speed. It is after finishing the drill will be finally sharpened and ready for further operation. Properly performed sharpening can ensure a long tool life within the requirements: do not make a notch in the tree during drilling, draw chips through the body of the drill.Back to table of contents
Sharpen the drill: practical recommendations
If there is no specialized sharpening machine, it can be made by yourself. To do this, it is sufficient to securely attach another electric tool, for example, a grinder to the frame. Or mounted on a stationary bed the engine, in which the shaft rotates with a frequency of 1000-1500 rev / min, while its power lies in the range of 100-300 watts. The platform for such a homemade sharpener can be made of wood, thick plywood. The main thing is that the engine was securely fixed and there was no vibration when the engine was running. This will allow you to properly sharpen the tool. Another requirement for the engine - the ability to change its speed smoothly. On the shaft wear abrasive wheel. The grinding itself is performed until the metal begins to reflect light. The angle of the cutting edge depends on the metal from which the drill is made and ranges from 90 to 120 °. This indicator is described in the documentation for sharpening a specific type of drill.
The back of the cutting edge should be a cone shape. In the process of grinding should be removed at least 0.15-0.2 mm for 1 pass.
If the sharpening is done manually with the help of a file, then it should be started with a rough one. This can be done with a file with wide pitch notches. It should strictly observe the angle of the factory sharpening. Bringing the tool to the final form must be performed with a file with small notches. It is necessary to process both the cutting edge and the back part of it.