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Post by captbob on Jan 9, 2017 15:48:33 GMT -5
I have 4 Poly arbors that I am wanting to disassemble to take to my powder coating guy.
My question is about removing the shaft from the base of the unit.
Shaft seems pretty tight in the bearing on each side. Are the bearings pressed on the shaft or into the base? So, do I beat that sucker out (through) with a hammer or is there a method with a little more finesse to get that shaft out with less likelihood of my doing any damage to the shaft or bearings? There are no set screws or snap rings holding anything in place.
I'm thinking that the bearings should come out of the base as well, but that the shaft needs to be removed first. Suggestions on removing the bearings once the shaft is out will save me a future question!
Thanks!
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Post by Drummond Island Rocks on Jan 9, 2017 16:09:40 GMT -5
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Post by captbob on Jan 9, 2017 16:30:23 GMT -5
ah ha ... yes, the one that I am having trouble with is not a D14, but one of the other (older?) style like johnjsgems must have been playing with. I haven't gotten to the D14 model arbors yet. They have the snap rings and set screws. Still will want to remove the shaft and bearings on those as well to powder coat.
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Post by captbob on Jan 10, 2017 13:59:12 GMT -5
Still hoping for shaft (and bearing) removal tips & suggestions.
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,634
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Post by QuailRiver on Jan 10, 2017 16:27:34 GMT -5
Yes the D14 arbors with the snap rings and set screws are easy. But I've got a couple of those smaller D4 models (made for 6" dia. wheels) that have machined steel flanges mounted onto the arbor so close to the Aluminum bearing housing that there isn't room to get a set of gear/bearing pullers between to pull off. There are no set screws or snap rings but I never was able to figure out how to remove those machined flanges so I could slip the arbor out and replace the belts. So they've just been sitting idle in my shop for a few years now. So I too would be grateful to anyone who knows how to disassemble the D4 Poly Arbor and would share the trick to it?
Larry C.
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Post by johnjsgems on Jan 10, 2017 20:26:29 GMT -5
I put mine aside until I have more time but I pressed the old ones out with a bearing press.
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Post by captbob on Jan 10, 2017 20:37:01 GMT -5
Thanks John, how did you get the shaft out first? Same press?
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Post by captbob on Jan 11, 2017 18:18:20 GMT -5
This is the old Poly arbor that has me befuddled. Can't see a way to get that shaft & bearings out. It's an 8" arbor like the others that I'm messing with, just guessing an older style. Hoods are held on with U bolts. Would like to get these things apart for powder coating and replacing the belts. May take some thinkin' as to how!
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Post by MrP on Jan 11, 2017 18:45:51 GMT -5
This is the old Poly arbor that has me befuddled. Can't see a way to get that shaft & bearings out. It's an 8" arbor like the others that I'm messing with, just guessing an older style. Hoods are held on with U bolts. Would like to get these things apart for powder coating and replacing the belts. May take some thinkin' as to how! captbob My bet is that the shaft has a shoulder on end that the bearing sets against. Just press the shaft out the one side, which will push the bearing out, then you can use a drift through the inside to remove the other bearing. Good luck!.............................MrP
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Post by captbob on Jan 11, 2017 18:59:51 GMT -5
Thank you Mr.P I don't have a machine shop, any way to do this without a having press? I guess I could take it to a real shop, but then the cost of refurbishing just went up. Put the nut back on and try knocking the shaft through with a hammer work?
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Post by MrP on Jan 11, 2017 19:05:22 GMT -5
Thank you Mr.P I don't have a machine shop, any way to do this without a having press? I guess I could take it to a real shop, but then the cost of refurbishing just went up. Put the nut back on and try knocking the shaft through with a hammer work? captbob That is probably the way I would do it. I would try it with a hard plastic hammer. It is a press fit so no telling how hard it will be to get it to move but they put it together so it has to come apart.....................................MrP
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Post by MrP on Jan 11, 2017 19:11:15 GMT -5
captbob Make sure you get as much nut on the threads as you can without the threads showing through. If it doesn't want to move easy the one way just try it the other way. Both ends should be just press fit the way it looks. Hope you win!..............................MrP
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Post by Drummond Island Rocks on Jan 11, 2017 20:04:02 GMT -5
A bunch of our local auto parts suppliers have small machine shops in them. I have taken my 14" saw casting in a couple times. They press out the old stuff for about $15 bucks then press it back together for another $15.
Chuck
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Post by johnjsgems on Jan 12, 2017 12:36:04 GMT -5
Buy a roll of plumber's sand paper cloth. Sand every shaft surface you can get to. Loosen pulley and slide back and forth cleaning shaft there too. Use lots of rust buster or other. Drive shaft through like MrP said (I would use a block of wood on the nut on the shaft). That should knock one bearing out. Then find a socket or pipe nipple that fits the outer race of other bearing and drive it out. I had to buy a press for building my saws and bought the 12 ton press at Harbor Freight on sale for around $100. They had a table top smaller model for around $60. It has proven to be really useful. If you are going to rebuild/refurbish units you may find a press very useful and worth the money. It would pay for itself quickly over paying machine shops. Mike Spicer gave me his source for bearings "The Big Bearing Store". The bearings I've ordered were very inexpensive. I have not had time to see if they have bearings for my old Poly.
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Post by captbob on Jan 13, 2017 12:27:18 GMT -5
Can using a penetrating oil such as PB Blaster (what I have on hand) to maybe help loosen these shafts up hurt the bearings? I'm reading online (where I learn everything!) that such products may dissolve the grease in the bearings. (?) Anyone have bad results from using such products where bearings are involved?
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Post by MrP on Jan 13, 2017 13:02:35 GMT -5
Can using a penetrating oil such as PB Blaster (what I have on hand) to maybe help loosen these shafts up hurt the bearings? I'm reading online (where I learn everything!) that such products may dissolve the grease in the bearings. (?) Anyone have bad results from using such products where bearings are involved? captbob If I was going through the work of tearing them apart I would put new bearings in anyway, but that is just me.........................MrP
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Post by jakesrocks on Jan 13, 2017 13:31:57 GMT -5
Not supposed to soak the whole bearing. Only where the shaft goes thru the bearing.
Suggestion. Drill a hole in a block of wood just large enough for your shaft to slip into. Clamp or screw the block to your bench. Stand your poly on end in the block. Squirt a little penetrant around the outside of one shaft & inside of the other. Let sit for a few hours then turn the arbor over & repeat. Let gravity help to get the penetrant between the bearings & the shaft.
Old Navy trick. Use oil of wintergreen as your penetrant. Much better than the commercial stuff. Make sure it's real oil of wintergreen, not the synthetic crap. If you have tender skin, don't get it on you. It burns like fire. Don't get it in your eyes. It can blind you.
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Post by captbob on Jan 13, 2017 13:47:10 GMT -5
Googled oil of wintergreen. hmmm... learned something today. Thanks Don.
I see that stuff is in my Marvel Mystery Oil.
Pretty sure that I can get the shaft(s) moving, just wondering about getting them through the pulley on the inside of the arbor. I'll git 'er done come hell or high water!
Like MrP said - if someone put it together, it can come apart!
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Post by jakesrocks on Jan 13, 2017 14:12:44 GMT -5
LOL. I have an old Poly that has to come apart one of these days too. Following this thread with interest.
I bought a left hand thread chaser a while back, just for my arbors. Right hand thread chasers are easy to find. Left hand not so much so. Most of the old Poly's have at least a few damaged or rusted threads. Thread chasers are your friend.
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,634
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Post by QuailRiver on Jan 13, 2017 14:50:11 GMT -5
Can using a penetrating oil such as PB Blaster (what I have on hand) to maybe help loosen these shafts up hurt the bearings? I'm reading online (where I learn everything!) that such products may dissolve the grease in the bearings. (?) Anyone have bad results from using such products where bearings are involved? I've heard that before too. But the type of insert bearings that these arbors use are not very expensive. If going to the trouble and cost of disassembling and having powder coated anyway, it might not be a bad idea to go ahead and replace the bearings too. Especially if the bearings inner collar are rusted onto the arbor shaft. Because when the arbor shaft is pressed out it may damage the bearing housing or seals. Larry C.
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