I had a suspicion that the very long deceleration times might have exposed a bug in the software. I doubt I’m exceeding soft limits, but I’ll run some more tests when I play with it next.
> On Jul 20, 2020, at 8:30 PM, Jon Elson <el...@pico-systems.com> wrote: > > On 07/20/2020 07:04 PM, Gene Heskett wrote: >> >> I think I'd drag out one of my 100+ MHZ scopes and look for noise of the >> type one might get from lack of a single point ground. > Right. if the indexres test of the diagnostics shows the position resetting > multiple times/rev > (may only happen when spindle drive is on) then there is noise on the Z. The > A and B have digital filtering that only accepts valid state transitions of > the quadrature wave, that hides a lot of really nasty garbage that some > systems have. There is no way to digital filter the index pulse, it is > edge-triggered, and a 10 ns pulse could trigger it. > > But, noise on the index will only affect the place where the spindle sync > motion starts. Once the spindle encoder senses an index pulse, then > everything is counted from there. So, a noisy index pulse should NOT cause > the Z axis to behave as the videos show. OHH, wait a minute! One thing that > COULD cause this behavior is if the move exceeded the Z soft limits. Z would > freeze at the most extended part, and then pull back when the spindle count > brought the position back within the soft limits. That's exactly what it did > in the first video. > > So, Matt should check what his Z soft limits are set to in the .ini file, and > then home the axis so > it won't be exceeding the soft limits. > > Having just spent about 3 weeks solving a ground loop issue on a PWM servo > system remotely, they > can cause an amazing array of crazy symptoms. Having the user shorten up all > the wiring fixed it. > > Jon > > > _______________________________________________ > 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
