On 8/12/2015 4:25 PM, Gene Heskett wrote: > On Wednesday 12 August 2015 12:35:18 Dave Caroline wrote: > >> Why stepper ? gearing up the speed with a pulley even less sense, they >> lose so much torque at a sensible lathe spindle speed that I cannot >> understand the reasoning for going down the wrong rabbit hole. >> >> Just think what would happen if your chatter frequency was anywhere >> near the stepper resonance too. >> >> I do use small lathes (watch (DC) and clockmaker (AC induction motor) >> sizes) and need to get the RPM up a lot for small stuff. >> >> >> Dave Caroline > In re gearing up a stepper to get the desired rpms, I am 110% with Dave > here. If you do not need the spindle to function as an angle lock at > arbitrary angle, then IMO the servo approach beats the stepper by a wide > margin. Very wide. > > Cheers, Gene Heskett
For a small lathe I'd consider using a sewing machine motor. Google "servo sewing machine motor" If you can tie into the speed control, it might work fine. And the price can likely not be beat. Dave --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
