Suggestions for repairing HP tape drive capstans?

[Rik Bos]

> -----Oorspronkelijk bericht-----
> Van: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
> Verzonden: maandag 19 april 2010 20:18
> Aan: cctalk at classiccmp.org
> Onderwerp: Re: Suggestions for repairing HP tape drive capstans?
> 
> > > > > 	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

I can't acces my HP 9144 at the moment but I opened up a 7946 whitch has a
9144 tapedrive build in.
And the sizes of the capstan are consistent with the ones you're measured.
So now it's for me the question where did I measured the other sizes
.................

-Rik