[fourperf]

Originally Posted by DareBee 3/8 UNC is 16 TPI 1"/TPI = .0625 per Rev 100RPM * .0625 per rev = 6.25 IPM

thanks a lot

I get the 1/16 as the thread lead which is the q # in format 1
the only other # I thought you needed is the F # (in a g84 tapping cycle)
which designates the rpm

what am I missing?

Mark