The Museum of HP Calculators

HP Forum Archive 05

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41 Card Reader O'rings ?
Message #1 Posted by CJ on 26 Feb 2001, 8:48 a.m.

Hello,

I have a card reader for the 41. Yes the roller is gummy. I read and printed the article that explains how to fix it. Fixing it is no problem for me.

I fly RC heli's and have fuel tubing coming out of my ears, but I would rather use the O'ring method instead.

Question is:

Where do I find these O'rings? Can anybody save me some gas and time looking for these?

Thanks,

Chris

      
Re: 41 Card Reader O'rings ?
Message #2 Posted by Ty Rogers on 26 Feb 2001, 5:15 p.m.,
in response to message #1 by CJ

Chris,

Try Western Auto, auto parts stores or hardware stores. Some auto parts stores have a box of small o-rings behind the counter. A good hardware store that always has what you need will probably carry them also. I have found the size "006" to be about the smallest and cost around 20 cents.

      
Re: 41 Card Reader O'rings ?
Message #3 Posted by Wayne Brown (Alabama) on 27 Feb 2001, 6:52 a.m.,
in response to message #1 by CJ

I found mine at a Lowe's home improvement store.

            
Re: 41 Card Reader O'rings ?
Message #4 Posted by CJ on 27 Feb 2001, 8:19 a.m.,
in response to message #3 by Wayne Brown (Alabama)

Thanks Ty and Wayne !

I'll check the auto parts and hardware stores.

I can't think of any lowes near me but there are home depots near me. I'm sure they carry the same items.

Now the operation begins.

Thanks again.

Chris

                  
Re: went with fuel tubing
Message #5 Posted by CJ on 10 Mar 2001, 10:16 a.m.,
in response to message #4 by CJ

Hello,

I found O'rings at home depot.

Danco #60 1/4 OD 1/8 ID 1/16 W

They seemed a little too hard and they would spin on the shaft.

So I did the fuel tubing method instead. It works perfectly now.

One thing I wanted to mention was that the worm gear was spinning on the motor shaft. I gave the collar a little squeeze and unfortunatly the paper or whatever that material is disinagrated. So I rapped double sided tape on the motor shaft then slipped the collar over the shaft and then stuck the worm gear on the end of that.

I then reassambled the unit and it was making a horrible noise. I took it apart again and isolated the noise problem.

It turns out the fix I did made the worm gear a little longer and were it fits in the plastic on the other end of the worm gear it was making the noise.

I put a VERY SMALL amount of slightly heavy oil on the end of the gear and now the unit is as quite as I remember a new unit being.

If your unit is making noise you might want to try this fix. Use a slightly heavy oil so it doesn't drip inside the unit. And use a VERY SMALL amount of oil. Not much is needed.

Hope this helps somebody, Christopher


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