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6th December 2012, 08:00 PM #1GOLD MEMBER
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removing ball bearings from their races
I read that bearing races make good parallels. I have a pair of worn ball bearings from my bench grinder, but I can't work out how to get the balls out. They fill slightly more than 180 degrees of the races (see pic) so the inner is locked into the outer. I tried putting a piece of MS bar through the hole, resting the bar across the vice, then giving the outer race a tap with the hammer; but they didn't budge. I assume the outer race is expanded with heat during assembly and the same method will be required for disassembly, but I don't want to overdo the heat in case I distort the races. Nothing useful from Google. Any clues?
Chris
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6th December 2012, 08:25 PM #2Philomath in training
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I did something similar recently.
From memory I pulled the inner ring over until I could push a ball out. After that it is less that 180 so the rest of the balls will fall out along with the inner.
Michael
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6th December 2012, 08:25 PM #3Senior Member
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6th December 2012, 08:26 PM #4GOLD MEMBER
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This will work
G'dy Chris
Hold the bearing in a vyce, and cut most of the way through the outer race with an angle grinder 180 degrees apart.
Then wrap the bearing in a rag, and give it a good tap with a hammer against a concrete floor or anvil of some kind. The rag contains the balls when the outer race splits. (saves chasing bouncing steel balls all over the workshop floor for the next 10 minutes)
Good luck,
Alan.
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6th December 2012, 09:14 PM #5GOLD MEMBER
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Michael,
I'll give that a try.
Nev,
I've seen that video. His method only works for bearings where the balls fill less than 180 degrees of the races. It's a no-brainer in that case.
Alan,
thanks, but I was hoping to keep the outer races for use as parallels too. Your method would ruin the outers.
Chris
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6th December 2012, 09:28 PM #6Cba
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> I've seen that video. His method only works for bearings where the balls fill less than 180 degrees of the races.
If more than 180 degrees, sipmly compress the outer ring into a slightly elliptical shape (maybe in a vise between two woods). That is also the way how these bearings get assembled in the first place. There is no permanent deformation if you do not overdue it. Chris
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6th December 2012, 09:39 PM #7Senior Member
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6th December 2012, 09:57 PM #8GOLD MEMBER
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Chris,
Thanks. I didn't know that's how they made them.
Nev,
At 3:20 in the video it says "The total angle of the whole ball should be less than 180 degrees"
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6th December 2012, 10:28 PM #9Senior Member
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6th December 2012, 10:40 PM #10GOLD MEMBER
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Well regardless, I can't get my inner race out using his method. As I said, I tried hitting it with a hammer and it didn't budge. I'm guessing his is a bee's d**k over 180 degrees and mine is bit more (maybe a wasp's).
I'll try Chris's method (squeezing) tomorrow.
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6th December 2012, 10:59 PM #11GOLD MEMBER
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OK, I couldn't wait till tomorrow. I used one of my Festool guide rail clamps to pull the inner and outer races together opposite the balls. I was surprised how much I needed to deform the outer races before the balls came out, but they returned to round. Night all.
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7th December 2012, 07:30 AM #12GOLD MEMBER
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7th December 2012, 08:03 AM #13GOLD MEMBER
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7th December 2012, 08:25 PM #14Cba
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If you think about it, the two apparently different methodos do exactly the same. By pulling the inner race up, all you do is expand the outer race from the inside into an elliptical shape. Only I feel it is much easier to squeeze the outer race from the outside into the same elliptical shape. Chris
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