hp 9145 capstan replacement

[hp-fix at xs4all.nl]

I think I misread you answer, 4mm tube for me is 4mm inside diameter, I suppose you mean 4mm wall thickness.
And the inside diameter of the 9144/45 is 12mm (~.5") the outside is about 18mm (~.7") (~3mm wall thickness).
I use polyurethane to make the new capstans, turn them on the lathe.

-Rik

-----Oorspronkelijk bericht-----
Van: cctalk <cctalk-bounces at classiccmp.org> Namens Chuck Guzis via cctalk
Verzonden: vrijdag 23 april 2021 20:24
Aan: CCtalk <cctalk at classiccmp.org>
Onderwerp: Re: hp 9145 capstan replacement

On 4/23/21 10:33 AM, Rik Bos wrote:
> That would not work the capstans of the 9144/45 have much larger 
> diameter. Those drives use DC600HC tapes not a QIC tape.

How do you figure that?  I've got a DC600HC cart here and it's the same dimensions as a standard DC600A cartridge--it is Iotamat preformatted,
without the usual optical sense stuff.   It was used on a number of QIC
(yes, it's quarter-inch) drives, such as the Kennedy 9455 and the ADIC 32-track drives.

As far as the capstan being too large, I suspect you may underestimate
the "stretchiness" of silicone hose.   Somewhere, I posted a photo if an
Archive 2060S drive with a red hose replacement capstan.

The hose comes in larger sizes, regardless.   I still need to refurb the
capstan on my 3M DCD-01 drive, but it's been too long since I've run into any 2-track DC300 tapes, so it's not a priority.

In any case, the suggestion is offered for whatever value one can gain from it.

--Chuck