Re: [CAD_CAM_EDM_DRO] Re: Looking for short ballscrew

Jon,

Backlash exists in the mechanical system but if you use the encoder to
control the position it should be without backlash. It's like putting the
encoder on the opposite end of the lead screw from the servomotor.

Smoke,

I think the cable stretch during a cut will be minimal.

----- Original Message -----
From: "Jon Anderson" <janders@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, December 01, 2000 2:22 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Looking for short ballscrew


> Greg Nuspel wrote:
> >
> > What if you used a servo motor on the fine feed wheel input, but ran
> > a cable to a clamp on the quill. This cable then runs over a drum
> > attached to an encoder. Now you have no backlash in your system.
>
> Wrong. Backlash still present, there's just some feedback as to where it
> is. Well, I'm running Ahha, no encoder feedback.
> I like trying odd things now and then, but when it comes to putting
> bread on the table and keeping a roof over my family's heads, I'll stick
> with proven technology.
> In typical fashion, I embarked upon a plan without thinking it through
> completely. It only took a few minutes of real measuring to see that the
> hardware I had wouldn't work like I thought, and a few more moments to
> realize the whole approach wasn't as cost effective as the off the shelf
> quill drive.
>
> Jon
>
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