Re: [CAD_CAM_EDM_DRO] DRO linear encoder scales

My idea was to use a dig. caliper with spc out. I took one apart to find a
printed circuit strip glued in a channel
of the rail. I think a person (with existing eqpt.) could
engrave a longer strip and rail to use with any linear app.
These things have gotten really cheap ($40)

----- Original Message -----
From: "Larry Edington" <ledington@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, February 21, 2002 11:31 PM
Subject: [CAD_CAM_EDM_DRO] DRO linear encoder scales


> I recently had the displeasure of parting out an HP 2000C printer. ( it
died and I wasn't just going to throw it away! ). When I got the top cover
off I noticed a strange looking plastic strip running parallel to the print
head path. Turns out HP uses a plastic encoder strip with a standard Heds
sensor for the X axis positioning on this printer.
>
> Which brought up the idea. Has anyone ever tried making their own encoder
scales?
> Are these things even called scales? Do I have the correct term?
>
> It seems to me that it would be fairly easy to laser etch the correct kind
of plastic and then wipe on some ink to fill the resulting stripes.
>
> Or create them photographically. I know I used to print PC board layouts
at 2x or 4x and have a print shop reduce them to a 1:1 negative with
fantastic results. Why couldn't you do this with the encoder scales? It
appears US Digital does this with the rotary encoders. Inside is just a
plastic disc with stripes.
>
> To me this seems like an elegent and cheap solution to the home shop DRO.
HP mounted the strip at one end rigidly and the other end with a spring.
>
> The first problem I see is variations due to temperature. But surely there
is some stable plastic out there we could use for this?
>
> Will it or will it not work?
>
> later,
> Larry E.
>
>
>
> [Non-text portions of this message have been removed]
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