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 20:24
> Aan: cctalk at classiccmp.org
> Onderwerp: Re: Suggestions for repairing HP tape drive capstans?
> 
> > I use rubber precision pipes (a special kind of rubberhose).
> 
> Deoes anyone know a UK supplier of small-ish quantities (I do 
> not want to buy 100m of the stuff ;-)). 
> 
> > Diameters for the 9144 are inside 6/16 outside 7/16 inch.
> 
> Do you mean that? The roller is a lot larger than that. OK, 
> it would stretch onto the hub, but surely if the inisde 
> diameter is 3/8" (6/16") and the outside is 7/12", them the 
> wall thicknerss is only 1/32". And the old tyre looks a lot 
> thicker than that.

Oops, wrong notes :-(
It should be inside 1/2" outside 11/16"


>  
> > I glue the with polypurethane glue and grind to the right 
> size using 
> > sandpaper 150 (3M wet or dry)
> 
> I asume you run the motor off a bench supply and carefully 
> hold the abrasive againsit it.
> 
> > I finish the capstands with a sandpaper 400 so the surface 
> is smooth.
> > For the HP85 / 9825 /9835 tapedrives I use a 6.5mm citroen 
> hydraulic rubber.
> 
> Is that what I would call a 'sleeve seal'? That is the little 
> rubber seal you put ove the enf of the pipe before screwing 
> the union down? IIRC they come in 3 sizes, I assume you need 
> the largest one.

Yes the sizes are 3.5mm 4.5mm and 6.5mm inside, it's a special kind of
neopreen which is oil and wear resistant.

-Rik