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Re: sharpening drill bits

Posted By: mike
Wednesday, 31 May 2000, at 8:29 p.m.

In Response To: Re: sharpening drill bits (AHandyman)

I've been sharpening bits for years but still don't always get perfect results. The trick is establishing the correct angle in two planes... the angle from point to side and the relief angle or how much higher the cutting edge is from the trailing cutting surface. Keep looking in hardware "how to" books and you'll find an article with sketches. Also I purchased a bit sharpener at Sears... I works about as well as my hand held attempts, sometimes great other times not.

The key I've found is using the side of grinding wheel... although we are not supposed to do this. Also, go very slowly - once you get the cutting edges lob sided it's hard to re-established proper length and angle.

Try with big bits first. I can always get good results on a 1/2" bit. Smaller than 1/4" diameter gets tough.

It's a great trick to have up your sleeve when working on a project late at night and a bit breaks... That's when persistance usually pays off and I finally get the edge lengths equal and angles correct to finish my task.

Good Luck!

mike

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