Quote:
Originally Posted by L78 Nova
I just purchased a new drill index (Korean made?) They drill triangulated holes !!! I don't understand how, but they do... GARBAGE.
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That is what happens when they are not sharpened right. One side of the drill point is longer than the other, causing the center to be off center, allowing the drill bit to wobble, causing a three corner hole. Resharpen the end, taking more off the short side to make the point even, and they will cut better. When a drill bit is sharpened right, you will have a chip comming off both sides of the drill. If your chip is only comming off one side of the drill, your point is off center.