4 Sep
2011
4 Sep
'11
1:52 a.m.
On 03/09/11 19:37, Tony Duell wrote:
It's HP-IB. Unfortunately one of the thumbscrews is missing from the
GPIB connector.
I've just
acquired a HP 7470A in a lot with some other gear, and it
Nice find!. Which version is it? There are 3, HPIB, RS232 and HPIL (the
last being by far the rarest). Alas you can't easily convert one to
another, there's one PCB inside, and it differs between the versions. I assume these are the little rollers on the clamp
arms above the plotter
deck.
Yep.
Whether a thin 'rubber' coating (for example
heatshrink sleeving) on a
tapered hub would work, I don't know. I think I'd try that first, because
it's not hard to make.
How are the rollers removed and reinstalled? I can't see any obvious way
to remove them without damaging the clamp arms.
Turning a tappered rubber roller is possible, but
rubber is not easy to
machine. It helps to cool it, but not too far (I am told that solid CO_2
is about the right tempeature).
Who said anything about machining the roller? :)
I just bought a pack of "Sugru" (a type of putty based on silicone)
which may well work for this. The trick is going to be making some form
of rig to make a tapered rubber roller of the correct size...
Thanks,
--
Phil.