Suggestions for repairing HP tape drive capstans?
ard at p850ug1.demon.co.uk
Mon Apr 19 13:18:15 CDT 2010
> > > > HP 9145A 36 Track < 0.800"
> > > >
> > > > That should be read as "just under 0.8 inch."
> > >
> > > 0.8" = 20.32mm Maybe the exact size is 20mm. Although I
> > would normally
> > > expect imperial measurements in an American device, I have noticed
> > > that all the screws in this drive have metric threads. So
> > perhaps it
> > > is a sensible diameter in milimetres.
> > Furter hto this. I've just put the micrometer on the
> > (cleaned) hub of the
> > 9144 that's on my bench. It measues 0.5925". This is almost
> > exactly 15mm, and I suspect that's what it should actually
> > be. Which makes a metric dimension for the outside diameter
> > more likely.
> I could be wrong but my notes (about 2 years old) tells my 12.7mm (1/2")
> inside and 17,5 (11/16) outside.
I willcheck again. I doubt I was 0.1" out, but it's always possibel I
made an error reading the micrometer.
Of course a 1/2" I/D tube would be a tight bit on a 15mm hub which could
well be an advantage.
I will also admit I've not opeened all the tape drives recently. It's
possible I still ahve one good capatan that I could measure. The 2 I've
looked at so far (one 9142, the other a 3-board 9144 have turend to goo,
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