On 12/12/2013 5:48 PM, Leonardo Marsaglia wrote: > 2013/12/12 Gene Heskett <ghesk...@wdtv.com> > >> I expect you can, but the heat method, where the screw is clean & has a >> coat of mineral oil on it prevent the acetal/delrin from sticking to a dry >> surface, gives you a thread that is about 40x more precise a fit _to_ >> _that_ _bolt_ than a tap ever could, because the taps and dies are sized >> for some dirt clearance etc. I'd make a SWAG and say that using a tap >> would be a very quick way to guarantee 10 thou or more of backlash.
I made a new brass nut for the compound slide on a 1940's 17" LeBlond lathe. The screw wasn't quite square thread but not quite ACME either. What it definitely was, was 5/8" 8TPI. So I bought a tandem roughing/finishing ACME tap and ran it through a hole of the right size in the brass. Well the screw didn't quite want to go through the freshly cut threads. So I slicked it up with some Deep Creep, chucked the screw in a 1/2" electric drill and I made it go through. After 3 or 4 times back and forth the brass deformed to accommodate the weird old thread shape and it's practically backlash free. ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
