Re: [CAD_CAM_EDM_DRO] Cheap source of encoders

Thanks for the information Jon. I'll keep lookin'.

Mike

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, March 12, 2001 1:21 AM
Subject: Re: [CAD_CAM_EDM_DRO] Cheap source of encoders


>
>
> mjohnson@... wrote:
>
> > Hello!
> > I am starting my first DRO, and I am trying to minimize my expense.
> >
> > I would like to know of sources for surplus or used encoders. I have
> > seen a few on ebay. Is there another source?
> > I tore apart an HP 500 inkjet printer and found the encoder and strip
> > was of 150 cpi, and that is not fine enough. Are there sources in
> > other products or different printers? Where else can I scrounge? I
> > am in Columbus, Ohio if anyone knows of parts sources here.
>
> Oh, I should have mentioned, shaft encoders are MUCH cheaper
> than linear. If you can use a shaft encoder on a leadscrew, you will
> get much more resolution. If the problem is leadscrew accuracy and
> backlash, then you can use a fine wire or thin metal strip to drive a
> rotary encoder from linear motion. Some people have shown projects
> which did this successfully.
>
> Jon
>
>
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