The correct angle of sharpening the drill

In the process of drilling often have to deal with different materials. So, at the time of wood processing, attention is not particularly drawn to the quality of sharpening, and this does not affect the material itself. When using metal, these indicators play a paramount role. You can feel the difference at the moment of using a specific sample: so, if at first the drill rotates vigorously, it gradually begins to slow down, as if digging into the base of the product.

Diagram of the device drill metal

Diagram of the device drill metal.

In this case, you have to exert maximum physical effort, pressing on the handle. The time during which the drill is blunt is determined by the following indicators:

  • speed;
  • fast feed;
  • cooling.

If this detail has unexpectedly failed, and there is still a lot of work to do, and there is no spare tool at hand, you can master the self-repair technique. It is possible to carry out such work both manually and automatically. In any case, there should always be several such drills in the reserve. Well-organized work allows you to acquire the desired angle of sharpening the drill, increase the period of operation, reduce the indicators of the applied muscle strength, facilitate the making of precise holes.

Hole drilling tools

Tools for drilling holes.

Choosing the necessary material for processing, you should consider the angular coefficients, they are different for all products. These values ​​are determined by the properties of each of the products. As soon as it is done, you can refine these factors with a goniometer or a template.

To implement such an event, you should prepare these attributes:

  • grinding wheel;
  • toggle switch;
  • plug;
  • stand;
  • strong motor;
  • wires and axis.

In order to avoid dangerous relapses, it is best to place the machine in the case, keeping the axis and the grinding device in the form of a circle from the outside. The product is powered by electricity. It can be connected to the network and perform the function of a portable and lightweight device.

The angle is determined by the degree of hardness of the material used. It will be more obtuse if the source is more dense in structure. A plastic product requires compliance with these coefficients of 30-60 degrees, steel needs 130-140 such units. In that case, if the qualitative results of the work are not very important, an angle of 90-100 ° is chosen.

Manual drill bit: characterizing parameters

Drill angle chart

Scheme angle sharpening drill.

The mechanical, manual way of an ottochka is carried out by means of an abrasive disk or the special machine. This technique involves holding the drill on the working base and its direction to the cutting edge. Lead hand to take the shank. The cutter is tightly connected to the side of the abrasive wheel. Then this part is gently rotated by the leading hand. The drill has to get the necessary inclination level and a certain configuration.

The sharpening of the drill is carried out alternately: first from one side and then from the other. It is necessary to monitor the cutting point of the cutting element so that the sharp part is located strictly in the center. This will help avoid further rotation of the drill in one of the planes. It is not necessary to apply excessive force when drilling, this contributes to lengthening the time of sharpening. With the mechanical version of the eyeglasses may appear flaws and defects. If the drill length is incorrectly calculated, upon completion of the outflow and tilt angles, the middle of the drill may shift relative to the axis and will move around it. To achieve the best results, it is worth using a grinding machine.

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Automatically drill the drill

In the process of honing you need to follow the starting angle.

Drill sharpening scheme

Scheme sharpening drill.

It is necessary to focus on him, then the condition of the tool is checked. The presence of significant defects gives the right to use emery with a rough basis. If the degree of blunting is low, it is possible to carry out the treatment with a grinding wheel. The process of drilling the drill is carried out in the following sequence: the first step is the processing of the upper edge, with pressure on which it is connected to the grinding wheel.

As soon as the rear base is processed and acquires the appearance of an exact cone, the cutting part of the drill is trimmed. Then final finishing is performed. As a result of the correctness of the actions, the dimensions of the jumper for drills with a cross section of 8 mm and more are equal to 0.4 mm. If this item is large enough, its value is 1-1.5 mm. You can understand the process of drilling a drill at first on any other surfaces.

The automatic machine is intended for processing of steel drills of through and deaf types, and also cast iron and alloys with a hard coating. Equipment of this nature is endowed with various functions, taking into account the varieties of ground, its dimensions and other indicators. When working on machine equipment, the angle is easily changed, you can start from 90 ° and finish with indicators of 140 °. The similar equipment is used in industrial and household use. The second option is a small-sized machine, convenient for home use. Their purpose is to sharpen the drill small size.

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Angle Coefficients of Drill Bits for Steel Surfaces

Diagram of the device for sharpening the drill

Diagram of the device for sharpening the drill.

Traditionally, the Boer has the appearance of a spiral. Details of this type can handle steel and wood. The spiral device has the form of a rod with two helical grooves. These grooves form on the cutter 2 feathers of a helical type, they are called teeth.

Spiral drill has a working part, neck, shank, legs. In the intake housing are all cutting parts. The guide part is driving the cutting process itself. On feathers in a spiral of a drill there are cylindrical ribbons. They define the drilling part in the hole. The excessive width of this part is not needed, it is equal to approximately 0, 46 mm. The foot and shank are designed to fix the drill in the spindle or equipment cartridge. The drilling element can have a neck or does without it.

The section of the drills measured by ribbons is different. So, the shank has a low performance, which can not be said about the intake cone. As a result, the percentage of contact between the ribbons and the walls of the holes is reduced, and friction is reduced.

Steel sharpened at an angle of 116-118 °. Getting started is associated with the creation of a cutting start, spiraling grooves easily move the chips. The drilling element should be held in such a way that the part to be sharpened is located in the opposite place from the axis of movement of the sphere. Similar activities are carried out with a different region. When machining steel surfaces, the optimum angle will be 140 °, while for the main number of drills it is 120 °.

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Level of inclination of the drill when processing wood

Drilling techniques

Drilling techniques.

The tree is drilled with a twist or drill. To do this, apply certain cartridges in the form of clamps. Drilled in the form of a screw of the manual type is used for the manufacture of grooves, their cross section is 5 mm. At the time of such events, the following factors are taken into account:

  • tree hardness;
  • presence and location of cracks;
  • deep drilling rates;
  • the presence of nails and foreign objects.

The loose structure of the tree requires chamfering, and large-sized openings are first drilled with a thin drill to give it the right direction. Through hole at the time of exit of the drill is closed with a wooden bar.

At the time of the work, the tool should be directed in the opposite direction from the master, eyes protected by special glasses. The coverage of this element, its centering in the cartridge should be evaluated.

Drilling holes in the wood does not imply excessive sharpness of the drill, it can work without periodic sharpening. But the use of metal requires such indicators without fail. The tilt level of the drill on the tree is 140 °.

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Angle sharpening factors for metal drills

When working with metal of solid grades, the level of inclination corresponds to 120 °, for softer surfaces such indicators are equal to 90 °. So, plastic bronze requires 120-130 °, copper - 125 °, plastic - 100 °, products with a brittle base - 140 °. As is clear, the angle of the drill point for metal is determined by the structure, softness and density of the sources used.

Soft products need a greater level of inclination, which is determined by production standards and requirements. For personal use, these figures are determined by the diameter of the drill. Thus, a cross section of 0.25-10 mm requires 19-28 °.

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