Sharpen drill bits. Three simple rules sharp sharpening

Hello, friends.

Often see such a picture: bought a drill, worked, blunted - discarded. The reason for this approach is simple. It is easier and cheaper to buy a new drill bit sharpener and what to look for him to carry the tool. In this article I will share techniques of sharpening, which I use myself. Drills are like new.

Sharpened by the way, it is possible without special tools. Emery enough. And if not, at least, the Bulgarian amiss.

Fell into my hands three drills. They have already tried to "sharpen" (as they could), it did not work. The final diagnosis is "drill, grind." But if they are carefully considered, it becomes clear that they will not drill. For sharpening the severity should be performed three simple rules:

• Sharpening angle of about 120 degrees and always the same for both cutting edges.
• The rear part of the drill to grind off more than cutting edge.
• The length of the cutting edges are equal.

sharpening technique

We stand a corner

Podvozhu cutting edge abrasion emery circle so that between the drill and grindstone angle was 60 degrees, and the cutting edge runs parallel podruchnik.

I'm doing this "by eye". If no experience, you can apply on line for podruchnik transports. It will be your guide.

Sharpen one cutting edge without changing hand positions, scroll, sharpen the second drill.

Grind down the back of the

With one hand, hold the drill closer to the cutting portion. The second of the shank. When omitting the shank down grinds the rear part of the drill, acquiring the desired profile.

If you put a drill directly on podruchnik, when tilted, it scrolls spiral. To avoid this, keep your fingers drill, and has to rely on his podruchnik. But do not forget about safety!

We check the equality of shelves

Monitor equality shelves can be on the line or pattern. When sharpened more than a dozen drill, more or less accurately obtained sharpening check "by eye".

If the length of the cutting edges are different, undermines the one that is shorter. Otherwise, the drill will be beating.

Someone drill - a disposable instrument. I have them live up to the state of "butts". It is a pity ribbon broke. You could even sharpen a couple of times.

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