RE: [CAD_CAM_EDM_DRO] Source of linear encoders

These are likely 150 lpi (lines per inch)

I know that older Tektronix printers (Phaser300 & Phaser600)
used similar fences that definitely were 150 lpi but used in a way that
yielded
300/600 dpi printing. This scheme relied on constant carraige velocity
and
clock multiplying.

I'd suggest looking into optical mouse chips from agilent, they can
supply a native
800 cpi (counts per inch) quadrature output for each X and Y.

If you can find a short linear optical sensor and mount it at a raked
angle to a linear
encoder fence, then you can achieve a good vernier result.

Maybe the mouse sensor with an attached raked-angle optical grating
moving over a linear encoder fence would yield good results on the
$cheap$

This would be limited by the frame processing speed on the mouse
chip....2300 frames second
(translating to a slower "fast slew" limit)

(google Agilent ADNS-2051 or Optical Navigation)
please post any experimental results...

-----Original Message-----
From: Lester Caine [mailto:lester@...]
Sent: Monday, February 02, 2004 12:28 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Source of linear encoders


As these could be something people here may have had a look
at, I will ask.
Does anybody have access to data on HP ink jet plotters?

I see two interesting parts at good prices, but no 'fine detail'

C4704-60224 is quoted as a 36" encoder strip
C7770-60013 is quoted as a 42" encoder strip

These are probably not high enough resolution, but given the
dots per inch on the HP plotters it would be nice to know.

We are looking for a source of a 'ruler' for a linear sensor
that does not cost the earth :)

--
Lester Caine
-----------------------------
L.S.Caine Electronic Services



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