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In Reply to: RE: A word of warning regarding spherical thrust bearings posted by Ugly on May 19, 2009 at 11:26:52:
As I understand it, 4.2 GPa is the standard used to calculate bearing loads according to ISO 281 of 2007 "Rolling bearings — Dynamic load ratings and rating life". This is for standard ball bearings with steel balls and races at a very high hardness and is calculated to give 90% survival at 1 million revolutions. That may sound like a lot but translating it into turntable terms that's a 10% chance of failure after 500 hours.
If you used the same material for your thrust pad and were prepared to accept that failure rate you could use that same stress in your calculation. If you use less highly hardened steel to improve the toughness of the bearing you would use a lower stress - I believe 1.8GPa is typical. If you used bronze you would use an even lower stress dpending on the type - ordinary bearing bronze is as low as 400MPa.Mark Kelly
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Follow Ups
- As I understand it - Mark Kelly 14:54:50 05/19/09 (1)
- Thanks. - Ugly 15:59:05 05/19/09 (0)