On Tuesday 29 August 2017 06:26:45 Johann Beukes wrote: > Thanks Gene > Is this something that I can correct in the settings? Its my first > machine build so my learning curve is very very steep. > Thanks in advance. > If you arrived at that -322 by adjusting it until a dial indicator said it was right, it wouldn't take a very big angular difference between the angle the dial was held at, and the actual travel direction to account for the 320 to 322 error. I'd set the driver for a divide by 8, and the step scale to 640. But at the same time, I do not think of that as the source of the randomization.
You are I assume feeding 5 volt logic to all + terminals on the driver, and the output pin of the breakout board to the individual - terminal. This use of the logic zero as the active part of the signal gives a much higher drive capability from the logic to the driver. I am not mentally comfortable with dirsetup and dirholds shorter than step pulses. If that driver demands 5 u-sec step signals, (thats a bit slow) I would extend the dirsetup and dirholds to 6 or 7 u-secs just to make sure it can't change direction in the middle of a step. Ideas to check IOW. > On 29 Aug 2017 12:13, "Gene Heskett" <ghesk...@shentel.net> wrote: > > On Monday 28 August 2017 16:25:06 Johann Beukes wrote: > > > Ok guys > > > Here's some more info on my problem. > > > I am very new to cnc so bare with me. > > > For example: Let say I want to cut a 10mm OD. The first part will > > > be spot on. The second will be 15 microns under and the third will > > > be 15 microns over and so it fluctuates with no definate > > > repeatablility. I have checked the x axis and my backlash is only > > > 5 microns so the mechanical side is ruled out. > > > > > > Here are some perameters from the .ini file > > > Dirsetup is 2500 > > > Dirhold is 2500 > > > Steplen 5000 > > > Stepspace 5000 > > > Stepscale -322 on a 2.5mm ballscrew. > > > Using a leadshine D808 drive. > > > > I am having some mental headscratching with these figures. I looked > > that drive up, and its one of the newer servo-steppers with a 1000 > > line encoder in the motor for feedback. That statement leaves some > > ambiguity because a 1000 slot encoder would be, to a quadrature > > circuit, 4000 edges per revolution. So is it a 250 line, giving 1000 > > edges or a 1000 line, giving 4000 edges? > > > > > I have been battling with this for 8 weeks with no success. > > > > > > Any help from you will be appreciated. > > > > > > Awaiting your responce. > > > > > > Best regards. > > > > > > Johann Beukes > > > > > > On 28 Aug 2017 14:47, "Gene Heskett" <ghesk...@shentel.net> wrote: > > > > > > On Monday 28 August 2017 07:52:14 jeremy youngs wrote: > > > > My 860 drives gave me a very hard time early on.only much > > > > sifting through the Chenglish did I realize the drive steps on > > > > the rise and fall. Requiring 1/2 the steps calculated. > > > > > > I have not found that to be the case here with a 'DM'860. Odd > > > indeed. The only comment I'd make is that the microstep current > > > mapping is somewhat less than ideal. It might be enlightening to > > > put a scope probe on the supply lines? Perhaps its ringing with > > > the changes in current draw? Just a SWAG mind you. > > > > > > > On Aug 27, 2017 11:12 PM, "Johann Beukes" <beukes1...@gmail.com> > > > > wrote: > > > > > Hi guys > > > > > I am struggeling alot with my lathe X axis. The machine does > > > > > not hold size at all. I am using The Leadshine ESM-22430 motor > > > > > and the DS808 drive. The Dirsetup is set at 2500, Dirhold > > > > > 2500, Steplen 5000, Stepspace 5000 and stepscale at -322. The > > > > > ballscrew has a 2.5mm pitch and the steps per rev are set at > > > > > 800. > > > > Which since the motor is a 1.8 degree per full step unless its a 3 > > phase, is equ to a /4 setting in the driver, in which case it would > > be 320 steps per millimeter, not 322. The source of some of my head > > scratching since I am assuming the machine unit is a millimeter. > > > > Personally I'd like to see the microstepping at a higher resolution > > than the encoder, or the steps per rev at /8 or even /16 if that did > > not exceed the input bandwidth which at the G0 speed which the pdf > > said was 200 kilohertz. But your 5 on 5 off step times are > > restricting you to 100 kilohertz. Converted back to MAXVEL, thats > > 312.5 rpms at the motor, times the 2.5 of the screw=781.25mm/m, > > which if my math is correct, is marching along at a good speed for > > an x drive. > > > > Can you access the driver and see/adjust the deadband and backlash > > settings? > > > > Do you have a heater or AC source directly on the machine that could > > effect its temperature on the same time scale as making the part? > > Even coolant temps ought to be checked if coolant is used. > > > > Grasping at straws here for lack of info. Its even possible that you > > are the first to use one of these integrated drives, and that the > > rest of us can learn a bit about the care and feeding of this newer > > tech. > > > > There is, in the <wiki.linuxcnc.org> some data where one or two of > > the guys put an encoder on a stepper and incorporated that into the > > control loop, and there might be some clues in those case stories. > > Might be worth the time to read them if you have not yet. > > > > > > > Can anybody please give me some advice? > > > > > Thanks > > > > > ------------------------------------------------------------ > > > > > ------------------ > > > > > Check out the vibrant tech community on one of the world's > > > > > most engaging tech sites, Slashdot.org! > > > > > http://sdm.link/slashdot > > > > > _______________________________________________ > > > > > Emc-users mailing list > > > > > Emc-users@lists.sourceforge.net > > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > ---------------------------------------------------------------- > > > >---- -- -------- Check out the vibrant tech community on one of > > > > the world's most engaging tech sites, Slashdot.org! > > > > http://sdm.link/slashdot > > > > _______________________________________________ > > > > Emc-users mailing list > > > > Emc-users@lists.sourceforge.net > > > > 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) > > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > ------------------------------------------------------------ > > > ------------------ > > > Check out the vibrant tech community on one of the world's most > > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------ > > >---- -------- Check out the vibrant tech community on one of the > > > world's most engaging tech sites, Slashdot.org! > > > http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > 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) > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
