Suggestions for repairing HP tape drive capstans?

[Tony Duell]

> > > > 	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, 
though).

-tony