You may be able to counter the swarf problem by putting the sensors on
the bottom of the track as opposed to the top.


Shawn Wilton
Junior in CpE
MicroBiologist

Phone: (503) 881-2707
Email: shawn@black9.net

http://black9.net


Denny Esterline wrote:
>>Printers use a plastic strip with clear/opaque stripes:
>>| | | | | |
>>read with an optical device that moves with the carriage. Two placed
>>offset would give you double the resolution:
>>| | | | | |
>>  | | | | |
>>
>>Ok I'm having too much fun with ASCII art :)
>
>
> I actualy did some work with optical encoders out of inkjet printers. The
> printers I was using were 600 dpi and (not suprisingly) the encoders
> produced 600 cpi. Eventualy I got a PIC to decode the quadrature with an
> interrupt, worked prety good.
>
> Ultimatly I decided against trying to implement that on my mill because of
> the problems involved with swarf (swarf is a technical term for milling
> debris). Just a bit of crap on the strip and you get miscounts.
>
> BTW, one of the printers I used has a metal strip (probably laser cut)
>
> -Denny
>
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