Is the ball nut mounting block solidly attached to the back of the main spindle casting? There are probably 4-6 10mm or 12mm bolts, and 2 taper pins that attach the mounting block to the spindle casting, maybe the pins are sheared and the screws loose. Unless the mounting block is part of the casting, and the ball nut is in a cartridge that bolts/drops into the mounting block. That sounds/looks like a lot of backlash to be in nut alone.
On 2/26/2016 9:00 AM, Forum Deswysen wrote: > Hello Andy, > > Thank you for this additional information. > > *Can someone** tell me if this nut **is adjustable ???* > > Some pictures of the problem: > > To have no more weight on the screw, the head of the machine is placed on > its transport support > > https://drive.google.com/open?id=0B5hmBjm5ot8NOS1CdldvSi1MbzQ > https://drive.google.com/open?id=0B5hmBjm5ot8NS0Q5VDBvY3pGVjA > https://drive.google.com/open?id=0B5hmBjm5ot8NSDhCTmpsWkk3aVU > > Best regards, > > Pierre > > 2016-02-26 10:32 GMT+01:00 andy pugh <bodge...@gmail.com>: > >> On 26 February 2016 at 06:02, Forum Deswysen <forum.deswy...@gmail.com> >> wrote: >>> Yes that's it. >> Don't ignore the possibility that the backlash/ slack might be in the >> ballscrew bearings. >> >> Depending on the style of the ball-nut, it might be possible to adjust >> the backlash. >> >> Isel make adjustable ball-nuts: >> http://www.techno-isel.com/lmc/Products/BmNuts.htm >> If you have them, then you just need to adjust them. >> >> Often the ball-nuts are a back-to-back pair with a spacer to set the >> backlash/preload. If yours is like this, perhaps the clamping screws >> have loosened. >> If the screws are still tight then you might be able to grind / lap >> the spacer to remove the backlash. >> >> If the ballnut/screw is a single piece then the options are >> replacement or rebuilding with oversized balls. If the slack varies >> with position the then wear is uneven, and oversized balls won't work. >> This Amazon seller lists balls in very small increments around the nominal >> size >> >> http://www.amazon.com/Ballscrew-Screw-Balls-0-1244-mm3-1597/dp/B0070I6824/ref=sr_1_19?ie=UTF8&qid=1456479041&sr=8-19&keywords=precision+balls+ballscrew >> There are videos on Youtube showing how to re-ball a ballnut. >> >> -- >> atp >> If you can't fix it, you don't own it. >> http://www.ifixit.com/Manifesto >> >> >> ------------------------------------------------------------------------------ >> Site24x7 APM Insight: Get Deep Visibility into Application Performance >> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month >> Monitor end-to-end web transactions and take corrective actions now >> Troubleshoot faster and improve end-user experience. Signup Now! >> http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Thanks Rick Lair Superior Roll & Turning LLC 399 East Center Street Petersburg MI, 49270 PH: 734-279-1831 FAX: 734-279-1166 www.superiorroll.com ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
