CAD CAM EDM DRO - Yahoo Group Archive

Re: Re: smdromod.o was no reply/this is a test

Posted by Ray
on 2001-12-02 06:23:25 UTC
From: ccs@...
> Subject: Re: no reply/this is a test
<S>
> ObCncContent: with smdromod closed loop steppers under EMC, do they
> hunt?  Ie, would a servo loop closed via a linear encoder across a
> screw with substantial backlash be stable?  

Chris

To prevent hunting between steps you would need to set deadband to more
than 1/2 of one step. This is true with any of the stepper motion
modules. Overshoot with a lot of backlash is a different problem. Dave
Engval has scales on his mill and insists that backlash and overshoot with
servos is not a problem.

HTH

Ray

Discussion Thread

Ray 2001-12-02 06:23:25 UTC Re: Re: smdromod.o was no reply/this is a test