Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: BOUBOU on October 18, 2007, 06:58:23 PM

Title: SERVO MOTOR RUNNING NOT SMOOTHLY
Post by: BOUBOU on October 18, 2007, 06:58:23 PM

Hi, I have a set of Gecko drives connected to 3 servo motors and one motor is not running smoothly... It is moving with small steps of a few touths yielding very rough surfaces.  I just don't know why because other motors are just fine...  It doesn't seem to be a mechanical issue because it remains the same in an unloaded state. It happens on every G code moves and during jogging.

Please help me someone.
Boubou.

Title: Re: SERVO MOTOR RUNNING NOT SMOOTHLY
Post by: Hood on October 19, 2007, 04:02:58 PM

Have you tuned the Gecko drive for that axis/motor?
What happens if you swap the drives around?

Hood

Title: Re: SERVO MOTOR RUNNING NOT SMOOTHLY
Post by: BOUBOU on October 19, 2007, 07:55:04 PM

Well, that is what we are testing right now (drive swapping).  I'll give you some news.  By the way, what can be wrong in the tuning parameters?  I put around the same acceleration slopes than the other axis.  The potentiometers of the gecko are exactly at the same position.  I've no clue of other critical parameters.

Thanks,
BOUBOU
Eastern Canada.

Title: Re: SERVO MOTOR RUNNING NOT SMOOTHLY
Post by: Hood on October 20, 2007, 08:03:40 AM

Not sure on tuning Geckos as my only experience of servo drives is more industrial types. With them there are a lot of settings you can change to fine tune the drives to the motors but I would presume you at least have the options for tuning the P I D on the Geckos?
Hood