18 Apr
2010
18 Apr
'10
3:58 p.m.
-----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?
would normally
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.
> 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 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.
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