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Lapidary / Gemstone Community Forum
January 20, 2019, 03:34:33 am
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Pillow Block Bearing questions

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Author Topic: Pillow Block Bearing questions  (Read 812 times)
RoyKims
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« Reply #15 on: July 18, 2011, 09:15:37 pm »

tyr Fastenall also.  you may have one locally.. they can order also.
also Napa auto supply

roy
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slabbercabber
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« Reply #16 on: July 19, 2011, 06:07:13 pm »

The bearings I see are light duty.  That would be OK on a diamond wheel machine, but when your silicon carbide wheels got out of balance, they quickly overwhelmed the load rating on the light bearings due to vibration.  Just replace the inboard bearings with similar inserts or more cheap pillow blocks.  BUT, on the end where you have an overhung load, you must have a heavier duty bearing.  The overhung load will cause many times the load to be applied.  The math is not difficult, but basically it is a function of the distance from the bearing times the radius of the load times the load.  That makes it a cubed function instead of a squared function for loads between bearings.  Yes, heavy duty bearings are expensive, but sometimes you need them.
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Roger
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« Reply #17 on: March 19, 2012, 06:31:27 pm »

Graingers is the answer its where I have found all my bearing needs. If you need help let me know!!!!
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johnjsgems
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« Reply #18 on: March 20, 2012, 08:43:48 am »

Those appear to be bronze bushings.  You really need a ball bearing pillow block.  I would follow Bobby's advice with the dimensions and locating something same sizes but heavier duty.  Something like  sealed/permanently lubricated bearing would be best.  You could take an old one to a bearing supply and have them find a replacement but prices are probably higher than some of the online sources.  Good bearings will last a long time so not a good place to try and save money.  Most people would not buy a pair of shoes for $4 but think a $4 bearing would be just the thing.
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Rockoteer
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« Reply #19 on: March 20, 2012, 10:57:59 am »

Those appear to be bronze bushings.  You really need a ball bearing pillow block.  I would follow Bobby's advice with the dimensions and locating something same sizes but heavier duty.  Something like  sealed/permanently lubricated bearing would be best.  You could take an old one to a bearing supply and have them find a replacement but prices are probably higher than some of the online sources.  Good bearings will last a long time so not a good place to try and save money.  Most people would not buy a pair of shoes for $4 but think a $4 bearing would be just the thing.
I most certainly would agree.

TOG
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