Hey everyone just a quick reply here. Jon yep I have a braking resistor. So I have the spindle accel and decel running through a limit component. Constraining rate of change.
Which works quiet nice. And I am have a custom m code that increases rate of ramp when rigid tapping. So I can do nice high speed ramping with low overshoot. I get about half a turn of overshoot max. Still need to automate changing ramp So any ideas on what is the best way are welcome. Options I know of are bash script or owords subs. Or maybe python Regards Andrew On Mon, 26 Apr 2021, 4:54 AM Jon Elson, <el...@pico-systems.com> wrote: > On 04/24/2021 05:00 AM, andrew beck wrote: > > > > if I try rigid tap at 1000 rpm at 1mm pitch i get a over travel of about > > 5mm. I can reduce the deceleration ramp in the altivar 71 schiender > drive > > to 0.5 secs and then the over travel is about one revolution of the > > spindle. but if i leave the settings in vfd like that and then run > spindle > > at 9000rpm the spindle goes into overvoltage faults. > > > Do you have a braking resistor on the drive? That is needed > to absorb the returned energy when decelerating the > spindle. If you don't have one, you need it. It is > possible to use an old-style "cal rod" stovetop heating > element as a braking resistor. > > Also, you may be able to use a limit3 or lowpass hal > component to slow the accel/decel of the spindle command. > > 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
