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In Reply to: Wait until you hear a Rek O Kut ..... posted by tubesforever on April 27, 2007 at 09:40:16:
I've been meaning to take your advice on this subject, but I've been busy building those speakers I mentioned earlier. by the way, I replied to you with a couple questions down the way a bit on that thread. I don't mean to be pushy, I just wasnt' sure if you were planning to revisit that particular thread so I mention it here. I'd appreciate your thoughts on that.Back to the subject at hand:
Where do you get the silicone nitride ball? How much?
I think you just answered my other question, but I guess when you say micropolish the bearing, you are refering to the shaft attached to the platter? Or are you refering to the bearing well, or both? I appreciate your suggestion to send you the platter, but I would prefer to do it locally if possible. You mentioned before to give it to a machine shop I think. Will just any old machine shop do or is there a place in particular you use? I don't really know where to begin with that and how do you communicate to them what you want? I suspect they get relatively few requests for vintage table bearing micropolishing.
Thanks for your thoughts on this!!!
Follow Ups:
... like I did.Mike
I don't know much about boca bearing.
A package of two silicone nitridge balls is less than 15 dollars shipped to your door.I have been using the 9/32 balls, but these are a little taller on some Rek O Kuts. The 1/4 inch balls would be fine.
Since I machine off the thrust surface and then polish it, the extra height of the 9/32 ball works beautifully for my applications.
The way to describe this to the machine shop is to take a measuring caliper and the main platter and bearing to the shop and begin taking measurements up and down the shaft.
If this is a good shop they will get interested and immediately find a caliper set for 10,000's of an inch.
Tell them that you need it polished to the lowest point and no more.
CAUTION....they might give you a silly look.....The Rek O Kut main bearings will have a run out of say 0.0007 inches. So you are asking them to polish out one thirtieth of a human hair.
Most will not want to do the work. It is not hard, its just not what the shop does for a living. They need to press out the bearing (easy) and machine the thrust surface flat and smooth. Then polish the main bearing so it measures exactly the same from top to bottom.
We are using a polish compound equivalent to what a jeweler would use for finish polish work on fine gold jewelry. That way we can polish for a minute and remove very little surface metal.
Most of the 20 minutes time was taken up making the measurements. We turned the lathe at 600 rpm and the dremel on steroid type polishing motor has a 2200 rpm motor. We use a hard cotton polish head and take it down to straight.
Here is the motor.
I am using Mobile 1 0-40 weight motor oil...yes 0 to 40. This is not as thin as water, but it is really thin for a motor oil.
nt
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