AArDvarK wrote:
Turn it real slow.

As far as that, what about the difference between the kind
with the shaft in the middle and the kind that is like a
spiral staircase? Wouldn't the shaft type be much stronger?

Alex...

It isn't so much about strength as it is about ability to
withstand heat. The cutting spurs are fairly vulnerable when the
bit is turned very much faster than a human can manage with a brace.

--
Morris Dovey
DeSoto, Iowa USA