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ROK bearing work?

Posted on January 10, 2017 at 22:11:24

Posts: 2584
Location: Austin,Texas
Joined: December 9, 2000
Sadly Jim with Applied Fidelity is no longer with us. I was talking to him about working over my Rek-O-Kut TT bearing, when he became too ill. With the loss of Jim and his company, I'm having a hard time finding someone to work over my ROK bearing. Does anyone know of someone that can do similar work?



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Very sorry to hear this. , posted on January 11, 2017 at 06:31:28

Posts: 639
Joined: November 24, 1999
January 18, 2009
I knew Jim was very sick. He was doing some work for me too and it was returned.

RIP Jim.


I know that early on, posted on January 11, 2017 at 07:04:06

Posts: 1479
Location: Houston, TX
Joined: December 16, 2002
when he was just experimenting with bearing surfaces (before Applied Fidelity) He simply took his bearings to a machine shop (I think it was just his borther in law's) and had what he called a micro-polish done to it. Basically he gave the bearings thrust plate a mirror polish. If you don't have a machine shop you might be able to do this with increasingly finer sand paper and eventually finishing with metal polish. I'm just thinking out loud, I've never tried it. That plus using the ceremic ball bearing made a nice improvement. It was not quite as good as his ceramic thrust plate, BUT definitely good and worth the endeavor.

Hope this helps.


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RE: ROK bearing work?, posted on January 11, 2017 at 09:14:38

Posts: 667
Location: NW
Joined: December 23, 2011
November 19, 2013
I really miss Jim, very sad. He did a lot of work on my L34, micro polished the spindle, put in a ceramic bearing and worked on the motor. Speed stability is very good. But despite all the work, the idler wheel itself is what will keep the noise down. I have 2 stock idler wheels which were rebuilt and are still a bit noisy. I also have 2 custom built idler wheels, one is aluminum and one is delrin, both have rubber o-rings. The noise level was substantially reduced with these idler wheels.

You can polish the spindle yourself as was mentioned by texanater.

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RE: ROK bearing work?, posted on January 11, 2017 at 10:40:16
Uncle Mike

Posts: 2305
Location: Eastern Pa.
Joined: June 20, 2003
Here is a link where he lays out his own work.Do a search here, there are more posts including when Tubesforever was experimenting. He left good documentation of his findings, much like yourself.
Let me know how you make out. I have a B12h I want to have done.


RE: I know that early on, posted on January 13, 2017 at 12:15:14
Industry Professional

Posts: 12252
Location: So. Cal.
Joined: February 9, 2002
what about a watch crystal for a thrust plate?

I would think a watch crystal and a ceramic ball bearing would be great.

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