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'[OT]: Optical encoders'
2000\09\08@191423 by Sean Breheny

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Hi all,

Can anyone recommend a good source for robust optical encoders
(quadrature or even single output line, around 200 to 512 counts per rev)?

This is for the ongoing micro aerial vehicle project here at Cornell(OT
because we are using AVRs <G>). We
are currently using E9S encoders from API Harowe but they don't seem to
be very robust, if the shaft is not exactly perpendicular to the encoder
face or if the shaft's vertical position can change slightly (due to lift
on the rotor which is attached to it), the encoder will wear very
quickly. Are there any encoders which don't have this problem?

By the way, Cornell's robocup (robotic soccer) team just won the world
competition (F180 league) for the second time, and they use PICs
(17C766's) in
the robots. For more info, take a look at http://www.robocup2000.org and
http://www.robocup.org

Thanks in advance for any help anyone can give,

Sean

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2000\09\08@200455 by Ricardo Seixas

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>Hi all,
>
>Can anyone recommend a good source for robust optical encoders
>(quadrature or even single output line, around 200 to 512 counts per rev)?

http://www.usdigital.com they have encoders up to 2048 counts/rev (8192 in X4 mode),
plastic case or heavy-duty IP64 aluminum case.


>This is for the ongoing micro aerial vehicle project here at Cornell(OT
>because we are using AVRs <G>). We

Where's the Inquisition these days... AVR's... shame on you... <G>

>are currently using E9S encoders from API Harowe but they don't seem to
>be very robust, if the shaft is not exactly perpendicular to the encoder
>face or if the shaft's vertical position can change slightly (due to lift
>on the rotor which is attached to it), the encoder will wear very
>quickly. Are there any encoders which don't have this problem?

Looks like you need a rubber 'shaft coupler' that will correct
misalignment without damaging the encoder.


>By the way, Cornell's robocup (robotic soccer) team just won the world
>competition (F180 league) for the second time, and they use PICs
>(17C766's) in

See... not so OT <G>

>the robots. For more info, take a look at http://www.robocup2000.org and
>http://www.robocup.org

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2000\09\08@202338 by Craig Lee

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Check out Stegmann!  I'm using the CP-350 series.

http://www.stegmann.com

{Quote hidden}

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2000\09\08@203548 by Sebastian Garcia

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Hi Sean,

-----Original Message-----
From: Sean Breheny <@spam@shb7KILLspamspamCORNELL.EDU>


|Hi all,
|
|Can anyone recommend a good source for robust optical encoders
|(quadrature or even single output line, around 200 to 512 counts per rev)?


Try http://www.motioncontrol.com

Best Regards,

S.-

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2000\09\09@213717 by Randy A.

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Sean:

In the manufacturing industry manufacturers such as Litton, BEC, Dynapar,
Eltra, and Hohner have proven to have very very robust encoders.  I don't
know the price range you are looking for but these would likely be somwhere
between $200.00 USD and up probably topping out around $1000.00 USD for the
smaller sizes.  The price, of course, would depend upon the configuration and
if it is Mil-Spec etc.

Most of these, if not all, can be found on the internet just doing a search.
It sounds like the ones you are using probably have a bushing instead of a
ball bearing for the shaft support.

Hope this helps,

Randy A.

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2000\09\12@082223 by Simon Nield

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Hi Sean,
one option might be to use a seperate sensor circuit and codewheel  - the distance of the wheel from
the fixed surface is not hugely critical with the part I have used (HEDR8100 i think) so some wobble
can be accomadated.
I can recommend these people for codewheels that are good quality and cheap, even for small numbers:
www.pwb-ruhlatec.com/englisch/index_e.htm
They came out significantly cheaper than usdigital's quote, and are also in the same timezone as me
which helped ;)

Regards,
Simon

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