HP Forum Archive 15

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HP 97 card reader rebuild, How many white beads Message #1 Posted by Frederick Harvie on 13 Nov 2005, 6:56 p.m. I have a HP 97 card reader apart for a rebuild and I can't tell wether I have lost a bead . I have 4 but there seems to be place for 5. On the other hand if I use all 5 spots it appears that 2 of them would make the same contact.

Re: HP 97 card reader rebuild, How many white beads Message #2 Posted by Katie Wasserman on 13 Nov 2005, 7:10 p.m., in response to message #1 by Frederick Harvie There are 4 balls and one roller. Look here: http://www.hpmuseum.org/guest/davis/97repair/step13.jpg . The balls are easy to replace, Small Parts sells exact replacements http://www.smallparts.com/products/descriptions/bn.cfm; the nylon roller is another issue -- I hope that you didn't lose that!

Re: HP 97 card reader rebuild, How many white beads Message #3 Posted by Tony Duell on 14 Nov 2005, 1:40 p.m., in response to message #2 by Katie Wasserman One of my 67's has a brass roller, not the official HP plastic one. It was missing when I was given the machine, I didn't have a spare, so I spent a little time turning a replacement from a bit of scrap brass.... I don't recomend this :-)

WOW, that's impressive! Message #4 Posted by Mike H on 14 Nov 2005, 3:33 p.m., in response to message #3 by Tony Duell Quote: One of my 67's has a brass roller, not the official HP plastic one. It was missing when I was given the machine, I didn't have a spare, so I spent a little time turning a replacement from a bit of scrap brass.... Having lost two of those tiny rolling pins during the same card reader repair, I could not imagine trying to turn one out on a lathe! Maybe if I had a micro-CNC machine and an electron microscope.... still, no. Mike

Re: WOW, that's impressive! Message #5 Posted by Tony Duell on 15 Nov 2005, 8:08 a.m., in response to message #4 by Mike H CNC, we don't need no CNC :-) No, I made it by hand on a Myford 7... Unlike most UK lathe owners, I didn't get this machine to make model steam engines, I got it to make spare parts and special tools for vintage computers, calculators and other electronic/mechanical devices

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