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Lapidary / Gemstone Community Forum
February 22, 2019, 02:10:45 pm
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Poly Arbor Bearings

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Author Topic: Poly Arbor Bearings  (Read 333 times)
bobby1
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« on: October 26, 2015, 05:16:11 pm »

Does anyone have any experience with rebuilding Poly Arbors?
Our club has many of these in the shop and we are having to replace the bearings in one and the bearing info doesn't come up on any bearing supplier's books.
Part no.  RAO12 CRS-2
Mfg. Koyo
Bob
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jakesrocks
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« Reply #1 on: October 26, 2015, 05:23:57 pm »

Have you gotten the bearings out ? If so, take careful measurements of the bearing with calipers. Any good brand of bearing with the same measurements will work. Just don't use Chinese bearings.
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slabbercabber
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« Reply #2 on: October 27, 2015, 06:24:45 am »

Be very gentle when pushing out the bearings.  I broke a very large one into several pieces by pushing on the shaft.  The structure is not strong enough to support the force of a frozen bearing.  Since that one I put a support internally between the two housings before I start pushing.
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mirkaba
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« Reply #3 on: October 27, 2015, 02:21:19 pm »

I would pull the bearings and take one down to bearing supply.
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catmandewe
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« Reply #4 on: October 27, 2015, 06:32:43 pm »

Take the bearings out and measure inner diameter, outer diameter, and width then go here

www.gotbearings.com/

input all the measurements, it will give you a part number.
You then input the part number into Google and pick out which ones you want to order.

Tony
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slabbercabber
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« Reply #5 on: October 28, 2015, 06:29:02 am »

I should have mentioned, be sure you get sealed bearings.  Open or shielded will fail quickly in a grit and water environment.
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PhilNM
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« Reply #6 on: October 29, 2015, 10:48:10 am »

Never been able to get the bearings out... how do you do that? I just keep wd-40'ing the existing bearings.... can't get at them from the inside, can't get at them from the outside!  maybe parts are all too frozen in place to get apart???
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slabbercabber
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« Reply #7 on: October 29, 2015, 03:49:05 pm »


WD 40 is not meant to be a lubricant.  Using it to free anything will be very frustrating.  For that, use PB Blaster or Kroil.  In this case however, that will have no effect.  The bearings are press fit.  Put a socket over the end of the shaft up against the housing.  It must be large enough so that the bearing can pass into the id of the socket.  Use a press to push the other end of the shaft and the bearing should pop out.  If you need to push very hard, then support the housing from one end to the other inside to prevent collapsing the structure.  It is possible the the shaft can move without removing the bearing.  I have not experienced this, but it can happen.  If it does, go ahead and push it out then use a shouldered shaft to push out the bearing.  Whatever you do, do not use a hammer.  If you have no way to press out the shaft, take it to a machine shop.  A good machinist can do this in just a few minutes and should be only a nominal charge.
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milto
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« Reply #8 on: October 30, 2015, 09:18:10 am »

If they are like my Poly arbor, they are exactly the same as Lortone units. They are held in place by a setscrew on a collar, the bearings are mounted in rubber and are very long lasting. I just replaced mine after 40 years.The bearings and rubber mounts are available from Lortone at a higher price take Tony Funks advice and order from them.
I should have added at start this is for 3/4 inch shaft unit.
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