Re: An o-ring for my card reader Message #4 Posted by Ellis Easley on 23 July 2002, 4:37 a.m., in response to message #3 by Tony Duell (UK)
I seem to have the #5 right but the diameters wrong!
The SmallParts.com catalog doesn't refer to the number sizes explicitly but they do have three digits at the end of their part numbers that are the same for O-rings of given dimensions - 1/4"OD and 1/8"ID, 1/16" thick is -006 in all materials - but the dimensions that they give corresponding to -005 are 7/32"OD and 3/32"ID, 1/16" thick. Do you think this is the same as you are using?
I have yet to do a card reader repair with O-rings. (I've only done one period!) I have replaced all the O-rings on my 9100 keyboard - the feel that results gives a satisfaction similar to that of a well-built car door closing. Transports me back to 1968 (or 1969 actually, mine is a B). I'm glad to learn about the silicone rubber O-rings. I think this property listed in the catalog: "Excellent resistance to compression set" will be very advantageous for the card reader wheel application.
The SmallParts catalog has O-rings in a variety of materials including silicone rubber, also teflon (I don't imagine that would be any good for this application!) and a material called Viton which has this stern warning:
"Great care should be taken in regard to burning Viton. When burned it gives off highly carcinogenic hydrogen fluoride. Merely handling just-burned Viton can be dangerous."
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