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Author Topic: Backlash compensation and jogging  (Read 3548 times)

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Offline Hood

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Re: Backlash compensation and jogging
« Reply #10 on: June 24, 2014, 05:03:10 AM »
You can then look to see how far off things are if that is the case also comparing one way multiple moves to see if they are on position.
Tuning can play a big part in being slightly out of position with Step/Dir servos as they may be well within the error range even when not in the exact position you have commanded. Dont know anything about the setup/tuning of the servos you use so cant say whether that could be the case or not.


Hood

Offline RICH

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Re: Backlash compensation and jogging
« Reply #11 on: June 24, 2014, 05:04:14 AM »
Quote
As for eliminating backlash, that's fundamentally impossible
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Basicaly true , but, you can minimize it. Very often the culprit is the thrust bearings and proper pre-load can reduce backlash.
If you realy get anal about this one can profile the ball screws movement over it's entire length in both forward and backward direction, test the ball nut play, measure the preload, etc. Based on measurements from a known standard, of resolution greater than the compnents, you can know exactly what you have.

BTW, I do my checking using optics. Also don't have servo's so Hood is a good source on that subject.

Good stuff to do if your borded on a rainy day and have the equipment to do it.


RICH
« Last Edit: June 24, 2014, 05:06:10 AM by RICH »