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.
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
