Precision vs. "Regular" collets
 

I had to cut and paste this in, because the number of
"References: " entries were too long for my editor to accept.

According to: on Tue Jul 6 19:37:17 2010
On Tue, 06 Jul 2010 02:40:40 +0000, DoN. Nichols wrote:

But the real question is whether you can cut a Morse thread with
a 1.5 mm pitch. Without that, you could make everything else right, but
not be able to make something which would accept the nosepiece. The
precise thread in inch units would be 16.9333 TPI. 17 TPI would be
close but not close enough 0.0667" error in a 1" thread with 0.058" per
thread, so it would be over a full thread in error.

With a standard gearset for an HF minilathe, 16.9231 is as close as
one can get to 16.9333 TPI, and 17.0182 for 17, via ABCD gear sets
{40 50 65 55} and {50 45 55 65} respectively.

That may well be close enough. For a 1" run, it would have a
total error of 2.08% of a thread. Does anyone have an ER-32 closer who
can tell how many threads are actually used?

Thanks,
DoN.