On May 23, 2011, at 12:13 PM, Viesturs Lācis wrote: >> Cool, AXES=8 and COORDINATES=XYZV worked! No more angular jog slider. > > Good to hear (read)! > >> Thanks! Now on to tuning the servos... > > Want to share, what are You using? Motors & drives?
We are using Keling servo motors (http://www.kelinginc.net/KL34-180-90.pdf) and Gecko 320X drives. Pictures: http://gallery.me.com/easterdays#100897 We are having a hard time getting the X axis driver tuned. The Y-axis (with 2 motors) seem to be pretty close to working though we need to better tune the Geckos - need to spend time with the oscilloscope. However, we cannot get the X-axis to work enough to even try to tune it. We get a constant stutter. Depending on the settings of the PID and current limit pots it is either a quick pulsating stutter, or a complete stop, then go, stop, then go kind of stutter. It is more pronounced if we are moving slow (50-150 in/min) and (mostly) not even noticeable if we are moving fast (300-1200 ipm). It may still be there at higher speeds - I may be able to feel a slight vibration - but it is slight if at all at that fastest speeds. Also depending on our pid pot settings we will have faults on every move or if we tune it just right, no faults, but just the bad stutter. We have tried swapping out all the hardware in the path. In fact I wired that axis though completely different path (the Z-axis which is not yet set up) and no matter what I try we cannot get rid of this. We can lessen it by tuning the pots but never fully eliminate it. If we fight the motion of the X-axis carriage (that is, try to pull/push) it as we move it, we can stop the shudder but still feel a vibration during travel. We are really about to give up on the 320X and buy Granites. The only thing I haven't tried is swapping out the motor itself, but I really find it hard to believe that the motor is the problem. Changing the motor is a major ordeal so I will only do this as a last resort. -Tom ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
