Anyone who at least once in his life has used a drill to get any holes, perfectly understands what can depend on how cleanly, accurately and reliably the drilled hole is obtained. The main guarantor of reliability in such work is the sharpness and correct sharpening of the drill. The drilling process is not always easy, and the cutting part of the drill itself deteriorates, it wears out and becomes dull. In order to use such a drill again, it is necessary to regularly restore the geometric shape and size of the drill. There is only one way to restore the shape and size of the drill. This is done by sharpening.
Instructions
Step 1
Drill sharpening can be done manually using special abrasive wheels or on sharpening machines designed specifically for this purpose.
Step 2
In order to carry out manual sharpening, take the drill with your left hand by its working part, try to keep the grip as close as possible to the cutting part itself. Grasp the drill shank with your right hand. Press the cutting edge of your drill against the side of the sharpening wheel and turn the drill with your right hand as slowly as possible. When turning the drill, make sure that the cutting edges are at the correct inclination to the axis, as well as that they take the required shape. Do not press too hard on the drill, this will negatively affect the sharpening process and may tighten it for a long time.
Step 3
The drill will heat up during the sharpening process. Therefore, take care of periodic cooling during the entire sharpening process, otherwise the loss of hardness will lead to unwanted deformation.
Step 4
Check if you sharpened the drill correctly. To do this, take a close look at the cutting edges of your drill. Ideally, they should be straight. The angle of inclination of the cutting edges in relation to the transverse edge for a drill with a diameter of up to 15mm should be 50 °, and for a drill larger than 15mm - 55 °. Also check the length of the transverse edge, which should be 10 … 20 times less than the main diameter of the drill itself. In the case of hand sharpening, all control measurements are usually made visually.
Step 5
If the cutting edges of the drill are not the same, the drill will become dull much faster than usual, since the load on its parts will be different, moreover, there is a possibility that the drill will very soon fail completely and will have to be replaced.
Step 6
If the cutting edges are not at the same angle to the axis of the drill itself, the diameter of the hole will be slightly larger than the required one, that is, the accuracy of the hole will no longer be achieved. When sharpening on special sharpening machines, errors in work, as a rule, are much less.
