HP 97 card reader rebuild, How many white beads



#2

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.


#3

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!


#4

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 :-)


#5

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


#6

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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