On Monday 19 November 2018 22:38:05 Tom Easterday wrote: > A friend is fixing up a 70s vintage surface grinder that has a ball > screw on the vertical axis and a non functioning drive.
What is wrong with the drive? It might be repairable with some fresh capacitors. > He wants to > replace what is there with a servo motor and driver and have a simple > control that lets him select several ranges, say 100, .010, .001, > .0001 & .00005 increments to move the spindle. That level of control isn't a problem, I can extract the hal code to do that from a $20 mpja dial encoder, increments the move in a .0001, .0002, .0005, .0010, .0020 etc. Needs a pushbutton to select the distance per click, then release the button and move it. Movement is shown in the lcnc monitors dro displays. I wouldn't do a servo if starting from square one. > He asked what motor, driver, and control to use. My experience with > servos is pretty limited, I’ve built one gantry machine with them. We > used Kelling servos, CUI encoders, Granite Devices drivers and Mesa > cards with Linuxcnc. A full Linuxcnc controller seems like overkill > though to control a single axis in fixed increments but I am not sure > what other options there are. I am curious what folks here would > recommend for this application? Because it will need to scan the surface, it seems to me LCNC would be pretty ideal, with suitably sized steppers all around. You don't normally drive a surface grinder at >20 ipm , and steppers can do that nicely. You can also write the code to remove as little as you want per pass, even staying ahead of wheel wear once thats been characterized. Seems like servo's would be overkill for that job. > -Tom My 2 cents Tom. > > _______________________________________________ > 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
