On Sunday 04 May 2014 04:59:17 Steve Blackmore did opine: > On Sat, 3 May 2014 01:14:36 +0100, you wrote: > >On 3 May 2014 00:53, Gene Heskett <ghesk...@wdtv.com> wrote: > >> But in grinding them down, its obvious I wall NOT have a good > >> shoulder because the 8mm is just about the bottoms of the ball > >> grooves. > > > >Rather than grinding, consider trying a CBN insert, and the fastest > >spindle speed you can manage. > >(Turning with CBN tips is closest to single-point grinding, if the > >material isn't red hot and fizzing, you need more spindle speed). > > You don't need CBN to turn ballscrews down. I've done dozens of them, > ordinary steel cutting carbide inserts work just fine. Just need to take > a decent initial cut to get through the hardened surface. Stainless > steel type feeds and speeds work fine on the surface layer and once you > are through they are quite soft and easy to work. They centre drill > easily then you can use the tailstock for support on the long machined > and threaded end.
If your tailstock is aligned. For starters mine is about .020" high, and gets worse when I run the barrel out. > I normally put them in the 4 jaw, take 0.25 to 0.5mm off first pass with > a CNMG type tool then switch to a DNMG for subsequent passes. > > Steve Blackmore That sounds as if I ought to be able to cut a thread with a single tooth carbide insertable, indexable tool then. Thanks Steve. > > ------------------------------------------------------------------------ > ------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For > FREE Instantly run your Selenium tests across 300+ browser/OS combos. > Get unparalleled scalability from the best Selenium testing platform > available. Simple to use. Nothing to install. Get started now for > free." > http://p.sf.net/sfu/SauceLabs > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available. Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
