Messages Archive

Subject:
Forstner

John K Jordan
Michael,

I keep several types of Forstner bits, imperial and metric. Sorry, I don't know the brands since I bought most of them over 10 years ago.

For rougher work, I prefer inexpensive carbide bits. They don't cut as crisply but they last forever. The higher quality steel bits cut cleanly but probably wear quicker - I don't use them as much so I haven't had to resharpen them.

But you mentioned the bits get hot. Have you tried cooling them while drilling? I always direct a strong stream of compressed air into the back of the bit the entire time. The bits cut better and stay a lot cooler since the chips are kept clear. The air also helps to keep the bit cool. This works so well with deep holes the bit doesn't need to be retracted. (I mostly drill deep holes on the lathe.)

If you haven't done it, touching dull bits up with diamond hones can help a lot.

JKJ

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