By the way, now that I have a really complex machine I can notice lots of things I didn't notice/learned before. So if I can help to improve the manuals I'm more than ok with that. At least, it's a good starting point to give something back to this awesome community. But I really don't know how are you guys managing that.
El jue., 30 abr. 2020 a las 21:35, Leonardo Marsaglia (< [email protected]>) escribió: > Great, but from what to what, so the fix becomes part of the list >> archive? > > > I started using *spindle.M.speed−cmd−rps *and it worked ok until I tried > G96. Three hours later I found that I needed to use > *spindle.M.speed−out−rps*. > > I don't know if this should be fixed because it's meant to be used when > the spindle works with a gearbox as Andy kindly pointed. What it should be > done is to specify that out in the manuals. The main difference is > *spindle.M.speed−cmd−rps* doesn't account for spindle overrides while > *spindle.M.speed−out−rps > *does. > > > > El jue., 30 abr. 2020 a las 20:54, Gene Heskett (<[email protected]>) > escribió: > >> On Thursday 30 April 2020 19:25:16 Leonardo Marsaglia wrote: >> >> > > However if that Yaskawa actually is counting steps, something I've >> > > never ever seen one of the clones I am using do, then you are >> > > probably just sending too many steps/second. I could be wrong, as >> > > its not impossible, but I'm thinking you may have miss-read the >> > > Chinglesh in the manual. But do check the polarity of the signal as >> > > it arrives at the vfd. In that event, switching to a pwmgen, >> > > running in pdm mode, may be the fix you need. >> > >> > Indeed it sounded strange to me too, and when we purchased the boards >> > to make the conversion we planned to drive the VFD with analog voltage >> > like usual but when I discovered that feature a few months ago I >> > decided to give it a try and save a 7i33 for later. It's working >> > pretty well now and I tuned it better today. It accepts frequencies >> > from 0.5 khz to 32 khz. We are peaking it at about 24000 khz but the >> > problem I had was the step lenght was to low for the driver to "see" >> > the pulses. Now I only need to filter the encoder from the spindle to >> > get rid of that noisy output wich is not hurting anything but it would >> > look better filtered. >> >> I've had that noise come back thru the servo driver strong enough to >> hammer the backlash and make it sound like all the ball bearings in the >> mills head had suddenly worn square. A higher res encoder stopped all >> that noise. I can also run 10x the Pgain w/o any instability. Sweet! >> >> > On other thing, css is scaled from x=0, if its not 0 as touched off at >> > >> > > the exact center of the workpiece, then css is going to be >> > > miss-applied. It does have gotcha's in that regard. >> > >> > Yes, I double checked that today and it was ok. My problem was the >> > output source of the commanded velocity for the spindle. I spent >> > almost 3 hours trying to figure out what was the problem and all it >> > took to solve it was to change a signal name in the hal file :(. >> > >> Great, but from what to what, so the fix becomes part of the list >> archive? >> >> > El jue., 30 abr. 2020 a las 14:41, Gene Heskett >> > (<[email protected]>) >> > >> > escribió: >> > > On Thursday 30 April 2020 12:36:00 Leonardo Marsaglia wrote: >> > > > Just to be super clear. I'm sending the spindle speed cmd velocity >> > > > to a step generator in velocity mode. Could this be the source of >> > > > the problem? Or does LCNC internally set the speed of the spindle >> > > > based on the X diameter? >> > > >> > > I must say thats an unconventional mode to me. I know nothing about >> > > your Yaskawa, but as a CET, one thought keeps running thru my mind. >> > > Most vfd's will do a decent job of averaging a digital command >> > > signal, giving about 50% speed for a signal thats high 50% of the >> > > time. We often set steppers up for a true=logic low, and feed the + >> > > line of the driver at 5 volts, and the step signal to the >> > > corresponding - terminal at the driver input. >> > > >> > > primarily because our interface electronics can sink lots more >> > > current in the logic low state than they can source in the logic >> > > high state, its the nature of TTL circuitry and the capability ratio >> > > can be 10/1. So an output that can sink 24 mills is a much better >> > > opto driver than one that can only source 2.4 milliamps. If you >> > > feed that "inverted" signal into most vfd's, they would interpret >> > > that 98% of the time logic high which you are sending it for a low >> > > speed command, the vfd will treat it as if its a high 98% of the >> > > time resulting in a high speed command actually being done. You >> > > should be able to verify that with the halscope. Or most any scope >> > > with sufficient bandwidth to show the steps as a well squared wave. >> > > If you are seeing a triangular wave, the scope isn't fast enough. >> > > >> > > However if that Yaskawa actually is counting steps, something I've >> > > never ever seen one of the clones I am using do, then you are >> > > probably just sending too many steps/second. I could be wrong, as >> > > its not impossible, but I'm thinking you may have miss-read the >> > > Chinglesh in the manual. But do check the polarity of the signal as >> > > it arrives at the vfd. In that event, switching to a pwmgen, >> > > running in pdm mode, may be the fix you need. >> > > >> > > On other thing, css is scaled from x=0, if its not 0 as touched off >> > > at the exact center of the workpiece, then css is going to be >> > > miss-applied. It does have gotcha's in that regard. >> > > [...] >> > > >> > > Cheers, Gene Heskett >> > > -- >> > > "There are four boxes to be used in defense of liberty: >> > > soap, ballot, jury, and ammo. Please use in that order." >> > > -Ed Howdershelt (Author) >> > > If we desire respect for the law, we must first make the law >> > > respectable. - Louis D. Brandeis >> > > Genes Web page <http://geneslinuxbox.net:6309/gene> >> > > >> > > >> > > _______________________________________________ >> > > Emc-users mailing list >> > > [email protected] >> > > https://lists.sourceforge.net/lists/listinfo/emc-users >> > >> > _______________________________________________ >> > Emc-users mailing list >> > [email protected] >> > https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> Cheers, Gene Heskett >> -- >> "There are four boxes to be used in defense of liberty: >> soap, ballot, jury, and ammo. Please use in that order." >> -Ed Howdershelt (Author) >> If we desire respect for the law, we must first make the law respectable. >> - Louis D. Brandeis >> Genes Web page <http://geneslinuxbox.net:6309/gene> >> >> >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
