Are these running single ended? Have you tried it with the spindle running?
sam On Sat, Aug 7, 2021 at 11:33 AM John Dammeyer <jo...@autoartisans.com> wrote: > Hi Jon, > > From: Jon Elson [mailto:el...@pico-systems.com] > > On 8/4/21 1:53 AM, John Dammeyer wrote: > > > In fact, a bit more work just now shows that the X axis is losing > position in the positive(?) direction. So on each return to X0 after a > > bunch of jogging back and forth (even without backlash enabled) shows as > high an error as -0.156". And it's cumulative increasing in > > the negative count direction. > > > > > > That wasn't there when I first changed from the US Digital Encoders to > the CUI encoders. So either the encoder is slipping on the > > shaft or the way the wires are run is creating noise that changes the > encoder values. > > > > > Yes, you have some sort of issue there.� The CUI encoders > > have a plastic collet that has a clamp ring that has to be > > snapped down quite forcefully to close the collet on the > > shaft.� Sometimes the molding is not precise and the collet > > doesn't grip well.� Some people put a drop of superglue on > > the shaft to make sure it holds.� I hope you can find the issue. > > > > Jon > > I pulled the motor off the machine and then removed the encoder part. No > matter how hard I tried I could not rotate the plastic collet that turns > the encoder disk. On solid. No super glue needed here. > > Decided I'd put it back together and use the instructions Henrik Olsson > gave me on interpreting the GP, GE and GT commands to his processor > module. Figured I would see if the 150,000 encoder counts were occurring > in a 10" move in both directions or if just in one. > > Wouldn't you know it. Works perfectly again. Doesn't matter how much > jogging I do a 10" move in either direction from 0.000" to 10.000" reports > as 150,000 encoder counts; as it should. Now once again the DRO-350 and > LCNC agree. > > Since I didn't change anything I can only assume that perhaps the teensy > tiny connector to the encoder has a poor crimp on one of the pins and the > vibration over time caused an erratic connection. Pulling it out and > putting it back in resulted in it (temporarily?) being properly connected > and now things work again. > > I guess I'm going to have to wait until it once again screws up > positioning while making something. Then only remove the encoder cap, > unplug and plug in the tiny connector and see if the problem is fixed > again. And I'm going to make up a second DB-15 to CUI connector for inside > the end cap just in case it's intermittent that becomes permanent. > > John Dammeyer > > > > > > _______________________________________________ > 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
