Hi guys again and thanks for all the answers :) Well, indeed the problem as Todd suggested is because of the driver limiting acceleration and velocity. I found in the manual that this can be changed and they recommend using a value 10 times higher than what LCNC commands. This is to avoid this peaking to max speed/acceleration problem of course.
The only drawback is that the only way to change these settings is using their software and a PC. At least that's what the manual shows. El mar, 24 ene 2023 a las 17:19, gene heskett (<ghesk...@shentel.net>) escribió: > On 1/24/23 11:07, Sam Sokolik wrote: > > This is why I don't like smart servo drives.. lol.. You don't know how > > well the drive is following the path linuxcnc is commanding.. > > My experience has been the opposite Sam. I have no PID's in the config > to run my Sheldon 11x54, I put a 3NM on the Z cause the carriage weighs > around 20 maybe more pounds. In all cases here I'm using the 3 phase > version, turns 1.2 degree per full step cycle. > > But I didn't have room for the length of a 3NM behind the new apron, so > I put a 2NM on to drive X. > > I took off a 1200 inlb nema34 as it could only do a g0 at 60ipm on a > good day, and took a nema 24 off the x because its max w/o a stall was > maybe 29 ipm on a good day. And both were noisy as can be. > > With the 2 nema-23 3 phase stepper/servo's, Z now moves at 120 ipm, and > x moves at 60 ipm, and at working speeds cannot be heard, only the belt > swish driving the spindle. Like watching Casper the ghost turning the > cranks now. > > I can position a chuck jaw to be hit with a missdirected tool at 10 ipm, > it hits the jaw sees the stop, and stops lcnc in about a millisecond. > The chip in the tool isn't damaged, and the jaw wasn't marked. The > motors run cold because the error controls the motor current. They WILL > GET to where they are told to go, or they will STOP LCNC in its tracks > midstep before the part is damaged. FWIW, that sort of a stop has yet > to happen while its working. > > I have a 6040 gantry mill, and the Z was too puny even after I binned > the electronics that came with it and replaced it all with LCNC feeding > 2m542's running on 42 volts. It's xy went from 15 ipm to 200 ipm but z > could just barely lift that water cooled spindle, but a 1NM > stepper/servo acts like it could lift another 25 pounds at 30 ipm. > > When I needed a B axis to make the vise screw I'm going to sell if I > can, I made several printed harmonic drives but could not get the speed > to spin the screw while I carved it. I had bought a 5/1 worm on spec 4 > or 5 years ago, so I put a 3NM on it with a printed shaft adapter, and > printed the chuck for the slow end of the worm driving a 2x2 hard maple > stick about 2 feet long. I can carve a screw at 200 rpm on the screw. > > There's more backlash in the cheap worm than motor error but I'm carving > a 2 start thread that fits perfectly by carving the 2nd start on its way > back to start a new 1st start. The hard maple stick is turning backwards > then. 180 degrees out of phase with the fwd motion. > > And Ali-Express is getting plumb reasonable on them right now. > > [snip Leonardo's problem, this isn't really part of that thread.] > > 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, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > 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
