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'[PIC]: Source for Optical Encoder Disc'
2002\09\02@105119 by kben

picon face
Hi,
Does anybody know a source that I would be able to purchase
encoder discs from ?  I am looking for a small disc (1 in.)
to place on an axle and then read the result with an
optical encoder to determine
RPM, for a PIC based mobil robot.
I don't have access to any machine shop tools so rolling
my own isn't working out to well.  I've tried hacking a mouse
wheel, but the results were disappoiting.

Thanks in advance,
Kevin

Please Reply To: spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU

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2002\09\02@113226 by Doug Butler

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There are photoetching houses that will etch anything for you if you give
them camera-ready artwork.  You should be able to get a letter size sheet of
thin brass with as many encoder disks as will fit for under US$100.  They
might even anodize them black for you.  Look at http://www.fotofab.com, but there
are lots of others.

Doug Butler
Sherpa Engineering


> {Original Message removed}

2002\09\02@125134 by Dominic Stratten

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face
My solution to anything like this is to use an old mouse (or a new one ! I
pay 0.50 ukp for a mouse). You get 2 nice encoder wheels and the IR
detectors to boot.

Cheers

Dom
----- Original Message -----
From: "Doug Butler" <SherpadougspamKILLspamATTBI.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Monday, September 02, 2002 12:31 PM
Subject: Re: [PIC]: Source for Optical Encoder Disc


> There are photoetching houses that will etch anything for you if you give
> them camera-ready artwork.  You should be able to get a letter size sheet
of
> thin brass with as many encoder disks as will fit for under US$100.  They
> might even anodize them black for you.  Look at http://www.fotofab.com, but there
> are lots of others.
>
> Doug Butler
> Sherpa Engineering
>
>
> > {Original Message removed}

2002\09\02@133610 by Morgan Olsson

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Hej Kevin A. Benedict. Tack för ditt meddelande 16:47 2002-09-02 enligt nedan:
>encoder discs from ?  I am looking for a small disc (1 in.)
>to place on an axle and then read the result with an optical encoder
Dissassemble a cheap PC mouse.  Then you get two small discs and also two compatible reader pairs :)

Or keep the controller, it report both axis movments plus two buttons on 5V serial 9600baud.  -Only one pin needed on the PIC!
But you get delay in the response then.

Farnell have industrial grade discs and reader.

/Morgan

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2002\09\02@141434 by Peter L. Peres

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On Mon, 2 Sep 2002, Kevin A. Benedict wrote:

>Hi,
>Does anybody know a source that I would be able to purchase
>encoder discs from ?  I am looking for a small disc (1 in.)
>to place on an axle and then read the result with an
>optical encoder to determine
>RPM, for a PIC based mobil robot.
>I don't have access to any machine shop tools so rolling
>my own isn't working out to well.  I've tried hacking a mouse
>wheel, but the results were disappoiting.

Depending on what you are trying to do and how much time you want to spend
normal PCB spray-on photoresist and copper or aluminium flashing will go a
long way.

Peter

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2002\09\02@141854 by Quentin

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Search the Agilent web site in the optical section. I have seen something
there.

Quentin
@spam@qscKILLspamspamiptech.co.za
http://www.iptech.co.za

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2002\09\02@184731 by Spehro Pefhany

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At 10:47 AM 9/2/02 -0500, you wrote:
>Hi,
>Does anybody know a source that I would be able to purchase
>encoder discs from ?  I am looking for a small disc (1 in.)
>to place on an axle and then read the result with an
>optical encoder to determine
>RPM, for a PIC based mobil robot.
>I don't have access to any machine shop tools so rolling
>my own isn't working out to well.  I've tried hacking a mouse
>wheel, but the results were disappoiting.


If you can mount a piece of film, it's easy to have the
output made. Here's an example of Gray-code artwork that
I wrote the code to generate:-

http://www.speff.com/gray_wheel.gif

It would be easy to do if you had access to a small lathe, but I'm
afraid anything is going to be difficult without tools at hand.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
RemoveMEspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
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2002\09\03@062317 by John

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Hello Kevin & PIC.ers,

The `best' answer will depend on what number of slots you
want on the disk.
You don't need quadrature encoding as this is only for RPM
detection, so I'll suppose a course slot number will be OK.

I've worked on machines where this was successfully done by
a photographic negative ( celluloid? ). A photo had been taken of the
correct pattern, in black & white.
Detection is then by slotted opto-coupler, TIL138 or so.

   best regards,   John

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2002\09\03@063011 by Jinx

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Fwded on behalf of Brian Harris
========================

Try http://www.usdigital.com/products/disklinear/
They have a variety of disc and hub sizes and pickups to suit.

Cheers,
BH

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2002\09\03@223029 by kben

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Thanks to all that responded. USDIGITAL has what I was looking for,
now if I can find a friend that needs 24,990 encoders, it will be
in my price range. :)

Thanks again,
Kevin

>Fwded on behalf of Brian Harris
>========================
>
>Try http://www.usdigital.com/products/disklinear/
>They have a variety of disc and hub sizes and pickups to suit.
>
>Cheers,
> BH

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2002\09\04@135324 by David Harris

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Well, I wasn't looking for you, but I have just bumped into this website

and they probably have what you want and not too expensive:
http://www.didel.com/microkit/pricelist/
David

"Kevin A. Benedict" wrote:

{Quote hidden}

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2002\09\04@142900 by Peter L. Peres

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>If you can mount a piece of film, it's easy to have the
>output made. Here's an example of Gray-code artwork that
>I wrote the code to generate:-
>
>http://www.speff.com/gray_wheel.gif

You can always print a large BW copy of the artwork, photograph it with
your slr camera and take the film negatives. You can make scales etc up to
18mm on a side like this. I once made a graduated wedge for a photometer
like this, and it worked great. The printer errors are scaled down tens of
times by the process.

Peter

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