I have a thrust bearing question
I have a thrust bearing question
(OP)
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
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





RE: I have a thrust bearing question
Russell Giuliano
RE: I have a thrust bearing question
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
RE: I have a thrust bearing question
RE: I have a thrust bearing question
http://www.scheererbearing.com
Russell Giuliano