Correct o-ring size for HP-65 and HP-67 card readers

[albertofenini]

Hello Everyone

first of all sorry for not contributing since a long time, but we have been busy on too many things ...

The quality of the contents have been constantly growing
so thanks for keeping alive this wonderful group !

Also, let me amend in advance because I'm pretty sure it has been asked and answered before,
I have however done some research but couldn't find anything, so here I'm asking ...

What's the best size ID/OD of the o-rings when fixing a gummy card reader ?

Thank you very much in advance !

Take care everyone !!

[AndiGer]

Hi Alberto,

Welcome back, great to hear from you again.

Searching the articles you can find an article on the HP-82104A O-ring size.
https://www.hpmuseum.org/cgi-sys/cgiwrap...gi?read=57

Searching the net for "o-ring s006" will give (for me in Germany at least)
https://www.lesker.com/flanges/silicone-...art/o-s006
where you find the exact measuring including mm and inches.

Buy from the seller of your confidence :-).

Andi

[born2laser]

for a possible US based alternative, last year I repaired the card reader in my 41, after reading many of the articles in the forum I went with the flexible tubing approach instead of the o-rings, and it worked well for me, granted, a lot of more experienced people here prefer the o-rings, but the clincher for me was the availability of the right size tubing.
I got it from McMaster-Carr, link to the item in question below

https://www.mcmaster.com/catalog/130/161/9627T13

[albertofenini]

(05-29-2024 06:50 PM)born2laser Wrote:  for a possible US based alternative, last year I repaired the card reader in my 41, after reading many of the articles in the forum I went with the flexible tubing approach instead of the o-rings, and it worked well for me, granted, a lot of more experienced people here prefer the o-rings, but the clincher for me was the availability of the right size tubing.
I got it from McMaster-Carr, link to the item in question below

https://www.mcmaster.com/catalog/130/161/9627T13

Thank you very much for your reply,
may I ask you why not using the 9627T14 ?
It looks more close to the o-ring specs

Let me know and thank agains !

[albertofenini]

(05-29-2024 05:19 PM)AndiGer Wrote:  Hi Alberto,

Welcome back, great to hear from you again.

Searching the articles you can find an article on the HP-82104A O-ring size.
https://www.hpmuseum.org/cgi-sys/cgiwrap...gi?read=57

Searching the net for "o-ring s006" will give (for me in Germany at least)
https://www.lesker.com/flanges/silicone-...art/o-s006
where you find the exact measuring including mm and inches.

Buy from the seller of your confidence :-).

Andi

Thanks Andy, I have two bags of two different sizes, and can't really distinguish them
I'll give it a try to the 006, but I guess I have always used something slightly small ...

Thanks again !

[AndiGer]

Hi Alberto,

The one‘s I bought and several times successfully used is 006
They are listed 2.90 x 1.78 mm.
First ID, second thickness

Good luck
Andi

[born2laser]

(06-03-2024 04:24 PM)albertofenini Wrote:  

(05-29-2024 06:50 PM)born2laser Wrote:  I got it from McMaster-Carr, link to the item in question below

https://www.mcmaster.com/catalog/130/161/9627T13

Thank you very much for your reply,
may I ask you why not using the 9627T14 ?
It looks more close to the o-ring specs

Let me know and thank agains !

That is indeed true, I had not noticed. I vaguely remember that somebody in the forum gave the dimensions of tubing they had used and I based my choice on that, it worked for me so I did not question it. If I had noticed at the time I would probably have ordered both!
One thing to note is that the tubing fits snuggly on the motor axis, and the ID of the o-ring is smaller, so it probably stretches more and the resulting OD is about the same (I am guessing wildly here).

Juan