Can you get the motor to run smoothly with no load? Gecko drives have a sterling reputation. I doubt that the issue is a Gecko drive and I think you proved that by swapping the drives already.
Have you tried driving this Gecko with a different output channel out of the PC? Are you happy with the performance of the Keling Servo motors on the other axes? What kind of reduction ratio to you have between the motor and the rack - motor turns per inch of travel etc. What is your encoder count. Are the encoders all the same? A coarse encoder count will tend to produce a stepped movement at slow speeds. >>but I really find it hard to believe that the motor is the problem According to Sherlock Holmes... who apparently had an interest in early CNC troubleshooting and used to live down the road from Andy.... ;-) _when you have eliminated the impossible, whatever remains, /however improbable/, must be the truth_ Dave On 5/25/2011 9:37 AM, Tom Easterday wrote: > 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 > ------------------------------------------------------------------------------ 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
