Hey all, for larger holes, my sense was that you want to make a pilot hole at
least as large as the length of the line-junction of the two cutting lips.
(And if I was more knowledgeable, I'd know the right terms for these parts of
the bit). So, a 1/8" pilot hole should suffice for a 1/2" final drill,
right?
Benn
Subject: Re: [Land-speed] tiny holes
Good idea Rich, I use center drills for 99% of the holes I drill. I also
step drill to the larger sizes and in some cases ream for a good fit. Us old
aircraft people were taught the proper way.
Glen
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