On 10/07/2015 07:34 PM, andy pugh wrote: > On 7 October 2015 at 23:43, TJoseph Powderly <tjt...@gmail.com> wrote: >> DC motors go much slower without cogging. Important for edm, polishing >> and grinding, not so much for other disciplines. > > Even with sinusoidal commutation? > have you compared the 2? i havent. I have seen slow <1mm/min 3phase servos chug instead of creep. ( Teco & yaskawa & panasonic on sink EDMS with 18"x12"x9" strokes, 400Watts. we changed drives as a way to debig what the heck was causing the lurching motion. Taiwan 2007 . going back to dc motors and copley 423 drives made it all nice again. ) so, i cant answer Tomp tjtr33
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