At 06:45 AM 5/28/2008, you wrote: >I know I,m missing something very simple here but: > >If I set max speed to equal feed speed the motors freeze on rapid moves. >With max speed about 15 they just about start turning. If I set max speed >to 20mm/s the motors do rapids move but do not go to the right position. > >There is also a reluctance for all motors to move in positive direction at >lower max speeds > >All this also seems to happen in Mach3 > >Unless anyone can figire this out I am going to rewire the drivers and >power supply with shielded cable and fix them to an aluminium base. > >Aaron
May have been mentioned before but that (low speed reluctance) sounds like classic stepper motor resonance problems to me. Do your drives have any adjustments for tuning that out? I have seen a half step unipolar drive where on phase was weak and when accelerating up to speed the motor would sometimes switch directions and end up running (very rough) in the wrong direction. __________ Andre' B. Clear Lake, Wi. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
