On Sunday 04 May 2014 08:17:02 Steve Blackmore did opine: > On Sat, 3 May 2014 23:11:32 -0400, you wrote: > >Greetings; > > > >In getting the end of the screw down to fit in an 8mm hole, the bearing > >boss, I have about 2 thou of the bottom of the original ball groove > >left. I am thinking that means its still harder that the hubs of ---. > > > >Correct? > > > >I haven't determined exactly where I need to thread it for the jam nuts > >that will adjust the end play, and probably won't know until the > >bearings get here, and I decide how long that backup washer on the > >inside will be. > > Turn it down for a 6mm thread.
Thats too small for my motor couplings, they are 1/4" to 1/4", eg 6.35mm. So 7mm.5 is as small as I can go. 8mm is even better. So I'll waste an insert trying for 8mm.75 threads. Adding the set screw, with a small lead shot for padding against the threads, is something I've planned already. > > I always use BK or FK type end mounts, they only use 1 nut to adjust end > float and preload the screw. It's drilled though with a locking screw > and pad onto the thread. > > See ebay items #321036123767 and #321036123861 as examples. The first one resembles the anchoring for the 16mm5 screw used as the Z on the lathe, 12mm bore and I had yet to get all the end play out of it even though I have extra shims between the bearings outer races. Poorly made, so I still have about .0015" of end play. 20 thou better than the OEM screw & half nut, but still... What I am using here is the OEM bearing casting, with its wide spaced mounting ears, using extended bolts and spacers so its also the motor mount plate holder. I can adjust those for zero end play AND they'll hold the motor too. I already have the ball bearing thrust washers in another set of them, on the existing ACME screws that will be coming out. That was by machining the inside cavity out to the OD of the washers, and doing the same counterbore on the outside face, about a thou shallower than the washer stack. They are also drilled & tapped for grease fittings. These will be too when they are done. > > The smallest housing they do has 10mm bearing bore, but I have used them > on 8mm screws. Just made a sleeve, loctite'd on to turned down screw, > left 24hrs then trued up to screw OD in lathe then threaded the end. > > Steve Blackmore Thanks Steve. 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
