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Why is the formula the same for ball bearings, roller bearings, needle bearings, when there appears to be different surface areas?

April 26, 2017appears areas Ball Bearings different Formula needle roller

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Why is the formula the same for ball bearings, roller bearings, needle bearings, when there appears to be different surface areas?

1 Answer

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An adjustment for surface area can be made by treating medium length roller bearings as 1-1/2 rows and long roller and needle bearings as two rows.