Re: [CAD_CAM_EDM_DRO] DRO linear encoder scales

What is the resolution of this encoder strip,I have
also seen such linear strip on usdigital.com,but their
resolution is not too high.

Babar
--- Larry Edington <ledington@...> wrote:

> 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
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>
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