RE: [CAD_CAM_EDM_DRO] Ball/Lead Screw mapping

Any slack/backlash in the system would definitely make it non linear...
PID systems such as Geckos have a very hard time with non linear
movements, especially around an end point.

We've got a Fagor DRO with quadrature scales on our mill that we'll be
removing shortly. We especially bought that DRO because the scales had
quadrature output... if I ever get caught up I'll test it.

Kim

On Thu, 2003-11-20 at 13:38, Dan Mauch wrote:
> I tried using a usdigital linear encoder with one of my 600 oz in servo
> motors on a mill/drill with zero backlash ballscrews but was using a 2/1
> timing pulley drive. When I turned it on it vibrated severely. I tried
> adjusting the dampening pot on the G320 but it didn't help.
> It may work on your direct drive setup if everything is quite rigid with
> zero backlash and a rigid coupling.
> Dan
>
> -----Original Message-----
> From: Kim Lux [mailto:lux@...]
> Sent: Thursday, November 20, 2003 11:58 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Ball/Lead Screw mapping
>
>
> I wonder if one could use the (quadrature) feedback from a linear
> encoder as the input to a Gecko 320 on a servo system to achieve a
> better position accuracy.
>
> Kim
>
>
> On Thu, 2003-11-20 at 10:36, Raymond Gage wrote:
> > Do any of the Parallel Port/Step & Direction control software pakages
> > out there allow for ball/lead screw error mapping?
> >
> > Thanks
> > Raymond
> >
> >
> >
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Kim Lux <lux@...>