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A word of warning regarding spherical thrust bearings

It is generally a mistake to increase the hardness of the thrust surface, especially if you have also increased the hardness of the spherical contact.

The relavant calculation is the Hertzian contact pressure for spherical point contact, an online version of which can be found in the link

Note that the default stress (4.2 MPa) is the standard ISO stress for ball bearing races and should not be used for TT bearing calculations. If you do not know the allowable shear stress limit for the material you are using you can substitute the 0.2% yield stress.

Edit: The 0.2% yield stress obviously only applies to ductile materials.

Mark Kelly


Edits: 05/18/09
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