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Technical Data

Fitting Practices

When interference-fitting a ball bearing into a housing or onto a shaft, consideration must be given to the amount of radial play reduction caused by the interference fit. Miniature, Instrument and Thin Cross Section bearings require a different set of guidelines than heavier cross section bearings. The method of manufacture of the contiguous components can have an effect on radial play reduction in Miniature, Instrument and Thin Cross Section bearings, yet will have no significant effect on heavy cross section bearings.

LOSS OF RADIAL PLAY: MINIATURE, INSTRUMENT AND THIN CROSS SECTION BEARINGS.

 

 1st 0.0001" OF
INTERFERENCE 		2nd 0.0001" OF
INTERFERENCE 		3rd AND BEYOND
0.0001" OF
INTERFERENCE
MACHINED SURFACE 0.000045" 0.000065" 0.000080"
GROUND SURFACE 0.000060" 0.000075" 0.000080"


LOSS OF RADIAL PLAY: STANDARD TO HEAVY CROSS SECTIONED BEARINGS.

 

 1st 0.0001" OF
INTERFERENCE 		2nd 0.0001" AND BEYOND OF
INTERFERENCE
OUTER RING 0.000045" 0.000060"
INNER RING 0.000065" 0.000080"
The above data was determined empirically. Bearings were disassembled and their exact raceway diameters were measured and recorded.
The components were then press fitted on a shaft or in a housing. The actual raceway diameters were then measured and the resultant loss or gain in diameter was noted.
The difference between the two readings is the actual loss in radial clearance.
EXAMPLE: Press an inner ring of a miniature bearing onto a machined shaft with a 0.0004" interference fit, the resultant loss in Radial Play is 0.00027">

 
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