But I did find, when I went looking; https://motorcityrepair.com/ball-screw-repair/
On Wed, 14 Apr 2021 at 18:17, Todd Zuercher <to...@pgrahamdunn.com> wrote: > Thanks, No I did not. But it appears they are in the UK, so not much help. > > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > -----Original Message----- > From: Roland Jollivet <roland.jolli...@gmail.com> > Sent: Tuesday, April 13, 2021 11:23 AM > To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Worn Ball Screw? > > [EXTERNAL EMAIL] Be sure links are safe. > > Did you try PGM Reball (saw them on an old video I have) > > > On Tue, 13 Apr 2021 at 14:38, Todd Zuercher <to...@pgrahamdunn.com> wrote: > > > Yes, near the limit switch, outside of the normal travel area, I can > > not measure any backlash. That pretty much points the finger squarely > > at wear on the screw as the main culprit. I think I have figured out > the "springy" > > backlash uptake mystery. It is simply the weight of the screw sagging > > down and resting on the nut pushing the table to the center of the > > ball grooves (remember the screw is more than 14ft long.) > > > > Anyone know of any good ball-screw refitters in the States? I already > > checked with one and they didn't want to touch it. > > > > Todd Zuercher > > P. Graham Dunn Inc. > > 630 Henry Street > > Dalton, Ohio 44618 > > Phone: (330)828-2105ext. 2031 > > > > -----Original Message----- > > From: Stuart Stevenson <stus...@gmail.com> > > Sent: Monday, April 12, 2021 11:12 PM > > To: Enhanced Machine Controller (EMC) > > <emc-users@lists.sourceforge.net> > > Subject: Re: [Emc-users] Worn Ball Screw? > > > > [EXTERNAL EMAIL] Be sure links are safe. > > > > Plus or minus .010 is an amazing amount. Also, you mentioned another > > area on the screw you saw .001 lost motion. This leads to a screw > problem. > > I would do what Jon Elson says as this sounds strange but I would > > expect to find screw wear. If it was nut wear the backlash in all > > areas of the screw would be close to equal. Not knowing the drive > > train maybe there is a gear train and one area of the gear train has > > worn teeth and where you found almost no lost motion is where the gear > train is the best. > > Expect screw wear but hope for a gear train problem. > > HTH > > Stuart > > > > On Mon, Apr 12, 2021 at 5:15 PM Jon Elson <el...@pico-systems.com> > wrote: > > > > > On 04/12/2021 09:48 AM, Todd Zuercher wrote: > > > > Those here who have had to deal with a worn out ball screw. > > > I'd dig into the works and examine everything. It does NOT sound > > > like simple wear. > > > The rotating nut likely runs in a pair of either angular-contact > > > bearings or tapered roller bearings. There will be a preloading > > > arrangement to constrain the nut. Also, the screw is usually fixed > > > at both ends. If the clamp has gotten loose at one or both ends, it > > > could allow some flex of the mount under load. Attach a dial test > > > indicator to the slide and read against the end of the screw, and > > > watch for movement when you apply load. > > > > > > Some old ballnuts were actually TWO completely separate nuts that > > > were preloaded against each other with Belleville washers. It is > > > possible some of the Bellevilles have cracked. > > > Also, they often used dowel pins to align the two nuts rotationally. > > > If one of the dowels has cracked, that could cause this kind of issue. > > > > > > Jon > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > -- > > Addressee is the intended audience. > > If you are not the addressee then my consent is not given for you to > > read this email furthermore it is my wish you would close this without > > saving or reading, and cease and desist from saving or opening my > > private correspondence. > > Thank you for honoring my wish. > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
