On Friday 08 November 2019 08:37:18 Todd Zuercher wrote: > I could see worn pulleys on toothed drive belts, and/or over tightened > drive belts giving results with delayed backlash take-up like that.
I hadn't considered that Todd, but I'd have to say thats one possible source. But the only time I've seen that is when TLM has burned up that plastic pulley because its being hammered on by at least 1.5hp worth of treadmill motor. Says 1 hp on it, at 90 volts but is seeing about 127 volts peak from one of Jon's pwm-servo drivers. It will break something long before it takes a no for an snswer > > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > -----Original Message----- > From: Thomas D. Dean <[email protected]> > Sent: Friday, November 08, 2019 12:30 AM > To: [email protected] > Subject: [Emc-users] Axes Names, Backlash and Overshoot > > I have a Sherline CNC Lathe with the computer system from Sherline. > The disk drive failed. I replaced the disk and installed LinuxCNC > 2.7.14. The install completed without error - great job. > > I have a problem with backlash and overshoot. > > The config file has a strange entry: > AXES = 3 > COORDINATES = X Z > > Should there be names for 3 axes? > > I checked the motion with a Fowler digital dial indicator. > > Backlash = 0.000 > Motion Fowler > Start +0.0001 > -0.0100 -0.0080 moved -0.0081 > -0.0100 -0.0175 moved -0.0095 > -0.0100 -0.0275 moved -0.0100 > -0.0100 -0.0375 moved -0.0100 > +0.0100 -0.0305 moved +0.0070 > +0.0100 -0.0210 moved +0.0095 > +0.0100 -0.0110 moved +0.0100 > +0.0100 +0.0010 moved +0.0100 > > Backlash = 0.0020 > Motion Fowler > Start +0.0100 > -0.0100 +0.0005 moved -0.0095 > -0.0100 -0.0075 moved -0.0080 > -0.0100 -0.0175 moved -0.0100 > +0.0100 -0.0055 moved +0.0120 > +0.0100 -0.0010 moved +0.0045 > +0.0100 -0.0110 moved +0.0100 > > Backlash = 0.0030 > Motion Fowler > Start +0.1245 > -0.0100 +0.1135 moved -0.0110 > -0.0100 +0.1065 moved -0.0070 > -0.0100 +0.0960 moved -0.0105 > -0.0100 +0.0860 moved -0.0100 > +0.0100 +0.0990 moved +0.0130 > +0.0100 +0.1060 moved +0.0070 > +0.0100 +0.1155 moved +0.0095 > +0.0100 +0.1255 moved +0.0100 > > Backlash = 0.0035 > Motion Fowler > Start +0.1260 > -0.0100 +0.1140 moved -0.0120 > -0.0100 +0.1075 moved -0.0065 > -0.0100 +0.0970 moved -0.0105 > -0.0100 +0.0875 moved -0.0095 > +0.0100 +0.1010 moved +0.0135 > +0.0100 +0.1080 moved +0.0070 > +0.0100 +0.1175 moved +0.0095 > +0.0100 +0.1270 moved +0.0095 > > I do not understand the relationship between the variables in the ini > file. Except for the backlash, I have not changed anything from the > distribution file. > > How do I fix this? > > Tom Dean > > > _______________________________________________ > 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
