I've made a new set of anti-backlash leadscrew nuts for the Beaver milling machine table.
A fixed nut and an adjustable anti-backlash nut.
The fixed nut is 2" long and 1 5/8" diameter . It has a 1" 5tpi ACME thread for the leadscrew and a 1 3/8" 20tpi thread for the adjusting nut.
I machined the bores, cut the threads to fit the leadscrew and adjusting nut all at one setting, verified the fits to be as near perfect as I could get and then mounted it on a mandrel to trim the OD to the required 1 5/8" diameter to be a snug fit in the housing.
Take 100 thou off the diameter, measure 1.724. Take 101 thou of the diameter to reach final size...
Oh Schidt. I now have 1.623" and a sloppy fit where it should be a snug fit.
Time to start again...
Mark Rand RTFM