On 5/4/2011 10:45 AM, John Doe wrote:
tnikkortjester gmail.com wrote:

...put a lead in chamfer on the part so the tap doesn't end up
chipping.

Thanks for the tip. That is useful also for cramming a rod into an
aluminum tube. Infrequently done here, but I need to remember that
one.

Yea, I normally go a bit bigger, about .015 - .02 per side, than the OD
of the tap.. eg. for a 3/8 tap, I would go with ~ .405-.415 chamfer.