Tape Drive Capstans

Randy Dawson rdawson16 at hotmail.com
Fri Jan 30 23:21:08 CST 2015

I found these to companies that specalize in rebuilding rubber rollers.  I have not used them yet, but going to see what happens with a RCA tape recorder from the 60's, that works fine but is slipping.


> Date: Fri, 30 Jan 2015 10:44:41 -0800
> From: aek at bitsavers.org
> To: cctalk at classiccmp.org
> Subject: Re: Tape Drive Capstans
> On 1/30/15 10:29 AM, Ali wrote:
> > How are you using these? Do you have the original OD and ID measurements of
> > the roller and slip the tube with the right OD over it?
> >
> Correct. You obviously have to have one surviving roller to be able to do this.
> Brad Parker fixed some TU58's a while ago and sent me a 1' piece of Norprene that
> a friend of mine cut for me. You end up with a lot extra because you have to buy
> 10' minimum. He also just did a few for the 9145s we have. You put
> a dowel inside the tube and cut using dish soap as a lubricant. He used an Xacto
> Saw blade.
> I guess creating a table for tubing diamaters that work with common pinch roller
> types would be a good thing. There are some rollers that may be difficult to do.
> The early DEI 1/4" cartridge drives have very small rollers. There hasn't been
> much experimentation yet as far as how much the outer diameter can vary. Most of
> the cartridge tapes I know of use self-clocking encoding formats, so it might
> actually be quite a bit.

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