The drill, like any other cutting tool on the farm, becomes dull with each new use, thus gradually becoming completely unusable. So sooner or later the moment will come when the drill will need to be sharpened again. In order for an old instrument to be like new, it is necessary to follow a few simple but very important rules that will help to make it perfectly sharp.
How do you know when to sharpen your drill?
Several telltale signs point to the need for re-sharpening the drill. All together and each separately, they tell the owner that the instrument is most likely dull. You need to pay attention to the following: rapid overheating of the equipment during operation, slowdown of the process drilling, violation of the exit of chips (with a blunt drill, it goes in pieces), the appearance of sharp and unpleasant sounds.
1. Correct angle
When re-sharpening, it is critical to maintain the correct angle. It varies depending on the type and purpose of the drill, as well as the metal from which the tool is made. For soft drills, the optimum angle is 100 degrees. For medium-hard bronze or aluminum tools, the optimum angle is 118 degrees. Stainless steel drills are sharpened at 140 degrees.
2. Using the template
You should not undertake independent sharpening of drills if the farm does not yet have suitable templates. The drill template must be mandatory, since it can be used to quickly and efficiently check the correctness of the sharpening already done. Fortunately, getting them is not at all difficult. It is enough to search the Internet for the corresponding request, and then print the image.
3. We use water
It doesn't matter which cutting tool you sharpen. Always use water in the work process. The edge to be sharpened must be regularly wetted. This will allow removing foreign elements from it formed during turning, and will also protect the cutting surface from damage due to overheating of the metal.
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4. Correct location
Any equipment during sharpening, including the drill, must be correctly positioned in space relative to the abrasive element. The most correct position (in most cases) is a strictly vertical position relative to the abrasive. This rule is equally true both when using special machines and when sharpening completely by hand.
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5. Compliance with edge dimensions
The rear cutting edge should always be sharpened more than the front cutting edge. The cutting edges must be different in length. Therefore, during any regrinding of the drill, its characteristics should be checked using a measuring tool. Even an ordinary ruler is suitable for such a task.
Continuing the topic, read about make a hole as quickly and easily as possible in "tool" steel.
A source: https://novate.ru/blogs/201020/56448/