I have a thrust bearing question 1

[DrDarrell]

I have a thrust bearing sitting on my bench. To order a new one would take 30 plus weeks, which I can ill afford.

I have decided to approach a few machine shops to quote repair or replacement of the races. But before I do, I want to understand the difference between the Ball Diameters and the Radius they ride in.

The Thrust Bearing is from a Vertical Turret Lathe. The generic size of the bearing is 28" OD x 24" ID x 2 1/2" high.

The Balls in this bearing are 1.0000" Diameter. The radius that the balls ride in is .5400".

What is the rational for having such a big disparity between the radius of the ball and the radius of the ball groove.

Darrell

 

[diskullman]

I would search around, somebody has one somewhere. Any part numbers on the bearing?

Russell Giuliano

 

[MikeHalloran]

If the ball race radius exactly matched the radius of the ball, they would scuff each other to death.

If the ball race were perfectly flat (and a cage were present to force the balls to roll in a circle), they would Brinell each other to death.

The race radius slightly larger than the ball radius allows them to have theoretical point contact, while deforming elastically under the applied load to keep the Hertzian stress reasonable.

Or, something like that. Actual bearing experts are invited to elucidate.

Oh. I agree with Russell. Someone, somewhere, has one on a shelf. Not even an accountant would throw something like that away.

... and very few machine shops could do a proper job of R&Ring something like that.





Mike Halloran
Pembroke Pines, FL, USA

 

[automatic2]

you would be further ahead, if you couldn't replace that specific bearing, to find one of reduced physical size and have the machine shop fab spacers/seats to postion it. Depending on the load exposure, it should last more than long enough to get the proper bearing in stock.

 

[diskullman]

I would contact a smaller bearing manufacturer, that can produce 1 piece much faster than the large companies, for a reasonable price.

http://www.scheererbearing.com

Russell Giuliano