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: zondag 18 april 2010 21:11
> Aan: cctalk at classiccmp.org
> Onderwerp: Re: Suggestions for repairing HP tape drive capstans?
> 
> > > I put a micrometer on the capstan in my 9145A. It had 
> turned to goo, 
> > > but not melted yet---so it was intact, but difficult to measure 
> > > without deforming. I got a reasonably accurate measurement off it.
> > > Based on experience, this should be close enough to affect a 
> > > workable repair (though I haven't gotten to actually 
> doing the repair yet).
> > > 
> > > 	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.
Tube thikness ~2.4 mm.
I used a 10/15 tube it has a tight fitting and I'm using it until today.
I use the same tube to fix the TU-58 works very well.


> 
> So I guess the 'tyre' is 15mm I/D, 20mm O/D (which would give 
> a wall thichness of 2.5mm). Now to find some suitable tubing...
> 
> I am pretty sure that all these drives use the same size capstan, BTW.
> 

-Rik