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Tool Talk Discussion Forum

Extracting Bearing Race

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Jason(PA)

02-26-2005 12:47:29




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Any I deas on how to get a bearing race out of a chunk of cast Iron? Im trying to get it out with out messing it up too bad. I might have to use it again if I can't find a new one. I heard that if I weld a bead around it that it will cause it to shrink up and fall out. Id like to try that,but would be affraid if it wouldn't work.
Any Ideas would be appreciated.




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Jason(PA)

02-26-2005 18:49:58




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 THANKS GUYS!!!!!!!!! in reply to Jason(PA), 02-26-2005 12:47:29  
THANKS FOR ALL THE HELP. I GUESS IM JUST GOING TO TRY THE WELDING TRICK.



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thejdman01

02-26-2005 17:37:38




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
I ASSUME NO LIABILITY FOR ANYONE USING ANY FORM OF THIS TRICK one thing i have seen done many times have done myself sadly to say more then once take a hammer hold on one side of the race take another hammer and whack the other side 180 degrees opposite where you are holding the other hammer. really good trick and does work but usually you get little bits and chunks of metal will fly everywhere including in peoples eyes and skin. i knew a guy who was wearing glasses and a face shield and a little sliver still managed to find its way into his eye and he went blind in one eye. now what i do if i have to use this trick it is by last resort use gloves leather long sleeves face shield goggles and drape a old bath towel over your arms and the piece your working on. work under the towel to say if it comes down to it. using a dull flat chisel on a air hammer and hitting it parallel with the shaft usually knocks it loose

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NC Wayne

02-26-2005 17:07:13




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
Hey Jason, I'm a heavy equipment mechanic by trade, and I can tell you that welding a bead around the inside of the race is one of the oldest "tricks of the trade" I know of. Like the other posts suggest, make sure you run the bead all the way around the inside of the race and let the start/stop point overlap to be sure the weld goes the full 360 degrees. If the weld isn't all the way around the trick will not work. You can do it with any type of rod,7018, 6011, etc, or even with a MIG, it doesn't matter. It doesn't even have to be "pretty", as long as it's a continuious bead and not intermittent piles of chicken shi- like some "welds" I've seen over the years. When the weld cools it causes the race to contract at the weld point which causes it to loosen. I've done it on bearing races from 1" OD on upwards of 8"OD and it has never failed to loosen them to the point they'll either fall out of worst case come out easily. Good luck.

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NC Wayne

02-26-2005 17:05:56




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
Hey Jason, I'm a heavy equipment mechanic by trade, and I can tell you that welding a bead around the inside of the race is one of the oldest "tricks of the trade" I know of. Like the other posts suggest, make sure you run the bead all the way around the inside of the race and let the start/stop point overlap to be sure the weld goes the full 360 degrees. If the weld isn't all the way around the trick will not work. You can do it with any type of rod,7018, 6011, etc, or even with a MIG, it doesn't matter. It doesn't even have to be "pretty", as long as it's a continuious bead and not intermittent piles of chicken shi- like some "welds" I've seen over the years. When the weld cools it causes the race to contract at the weld point which causes it to loosen. I've done it on bearing races from 1" OD on upwards of 8"OD and it has never failed to loosen them to the point they'll either fall out of worst case come out easily. Good luck.

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dieselade

02-27-2005 04:24:16




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 Re: Extracting Bearing Race in reply to NC Wayne, 02-26-2005 17:05:56  
I`d like to see someone weld the inside race on some of the bearings on a combine.



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NEsota

02-26-2005 15:48:22




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
I would like to understand the reason that running a bead helps to shrink a race for removal. In the event the race is in a horizonal plane, is/are the bead or beads run vertically or horizonal, inside the race? I can see how the bead would be hotter than the race when it adheres to it and that when it cools it would contract more than the race tending to shrink the race also. Is this the correct theory?

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msb

02-26-2005 18:23:06




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 Re: Extracting Bearing Race in reply to NEsota, 02-26-2005 15:48:22  
Seeing is believing.Take a straight piece of steel and weld a bead on one side only.Then check it for straightness.House trailer frames are done like this to build in support for the weight .The weld on the top of the frame rails causes them to cup up so when the house is built on the rails,they will support the weight without sagging.A welding bead always pulls or stresses the metal towards the bead.Its a phenomenum that engineers have to deal with every day in fabrication.

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Weirsdale George

02-26-2005 21:41:27




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 Re: Extracting Bearing Race in reply to msb, 02-26-2005 18:23:06  
Am I missing something here? Welding on the top surface would cause the house trailer frame to cup up ("holding water") building in a sag before the load was applied. The welded top side would shrink (inside radius) leaving the unwelded bottom surface longer (outer radius).



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Phil, MI

02-26-2005 15:08:38




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
Use a blind hole bearing puller!

Phil



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kidbob

02-26-2005 14:32:14




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
A good bead of electric welding (prefer mig) will make the race loose, some times loose enough to fall out. BE SURE TO LET IT COOL GOOD BEFORE TRYING TO REMOVE.



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dr.sportster

02-26-2005 13:05:55




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 Re: Extracting Bearing Race in reply to Jason(PA), 02-26-2005 12:47:29  
If what you are describing is a race with no way to get at the other side to place a punch or anything to drive it out.Ive had to slice an angle into it with the Craftsman Dremel cut offs.{NOT the dremel ones they will blow right out. [gently split with a chisel] .I know of no non destructive way without cutting the race.But Ill say a bearing supply house could probably get most bearings but not all .Good Luck.I cant weld because when I do it its on a Harley mag wheel.

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lucasss

02-26-2005 13:21:02




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 Re: Extracting Bearing Race in reply to dr.sportster, 02-26-2005 13:05:55  
i have removed many a race by welding a bead around it.just be carefull not to weld it to the housing. lucas



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Dean K.

02-26-2005 17:50:00




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 Re: Extracting Bearing Race in reply to lucasss, 02-26-2005 13:21:02  
NC Wayne is right, I have a few smaller conveyor rolls at work with the bearings in a blind hole. When they fail, the outer race is all that's left of the bearing. Weld a bead around the inside, quench if i'm in a hurry. They either fall out in the water bucket or after a good rap upside the workbench,Done! DK



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