On Thu, 28 May 2015 00:33:25 +0000 (UTC), Doug Miller
wrote:

Bob Gentry wrote in news:88ocmap4pjc1sbp1g9h4l1kh8ea9cj0oqv@
4ax.com:

On Wed, 27 May 2015 18:11:05 -0500, "Terry Coombs"
wrote:

snip

Sounds to me like the feed screw is 16 TPI . The X and Y axes on my RF45
clone are 8TPI , and advance .125/rev .

Yes, I see how the pitch determines the the advance. Just don't see
_why_ 62. grin

It's a natural consequence of a 16TPI lead.
16 threads per inch = 1/16 inch per thread
1/16" = 0.0625" so my guess is that you actually have an advance of 62 and a half thou per
revolution instead of exactly 62.

You are correct. Put a 1" dial indicator on it and measured two turns
at just a wee bit under 125thou. Guessing on a gage that reads .001
about .1248.
Bob
rgentryatozdotnet