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Polishing in my application....

Posted by tubesforever (M) on May 21, 2009 at 11:01:08

In Reply to: RE: Language T4 can understand.... posted by d to the g on May 21, 2009 at 08:45:07:

I appreciate the mature discussion points.

In my application the mirror polishing is not intended to improve longevity of the bearing. However I fully expect this finish preparation to achieve this result as well as achieve my intended goal.

For discussion, here is a picture of one of the worse wear marks I have encountered while refurbishing, restoring, or modifying a Rek O Kut turntable. The chrome surface had actually worn away from the ball (probably ran dry) and the ball and steel showed signs of rust.

This was a 30+ year old table when I refurbished it. This damage was created by pressure, friction and time. You are not kidding when you say time will be the nemesis of a ball riding against a thrust surface.

I have been asked to take my own improved bearing concept and build it into some of my friend's turntables.

In my opinion, in order to do this both professionally and responsibly requires a two piece assembly process. One piece will be installing the appropriate ceramic ball at the optimal height to engage the thrust surface. This might require machining for some platter bearings but this is pretty standard stuff for any competent machine shop.

The second and most important step is creating a removeable/replaceable mirror polished thrust surface that is durable, will resist Brinnelling, and achieve noise floors equal to or better than I have accomplished to date.

I completely agree that 1 year or more spin time is inadequate to test for wear and bearing performance.

Regaring the future of turntable bearings, looking at the space age plastics and ceramics we are dealing with today, I doubt a high quality turntable bearing manufactured 10 years from today will look anything at all like the bearings manufactured 20 years ago.

Thanks for your input. I highly value your experience and your opinions. This will be a fun and interesting process.

Cheers!


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