New Hampshire Ball Bearings, Inc. (NHBB) is a leading manufacturer of precision bearings and complex bearing assemblies for the global aerospace, defense, medical, and high technology markets. The company is a subsidiary of MinebeaMitsumi Inc. and an integral part of the global brand, MinebeaMitsumi Aerospace.

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The accurate diagnosis of a bearing failure is imperativeto prevent repeated failures and their additional expenses.This comprehensive guide to bearing failures outlines themany ways bearings can and do fail.

It is relatively easy to damage a miniature and instrument bearing during assembly simply by exceeding its load capacity. Adequate fixturing must be provided for handling and assembling precision bearings to ensure that:

Interferencefit

dramatically improve the value of industrial machinery. Combine high reliability and long life. Sealed bearings prevent entry of foreign matter and grease.

Bearinghousing tolerance

The bearing will be subject to early failure in most applications because it may already be overloaded. This problem can be solved either by a higher radial play or looser fit.

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A bearing that is fitted too tightly or too loosely, or is damaged during assembly by excessive force or shock loading, may degrade the performance of your assembly. Reduce this possibility by following some general guidelines during the design of mating parts and by observing the following four cautions during the assembly process.

L = Loose fit.T = Tight fit.d = Bearing bore as listed.D = Bearing OD as listed.+Bearings must be purchased with bore and OD coding. Example: To use SSR-2 bearing in a potentiometer, the shaft diameter should be .1250 –.0001 to .1250 –.0003 or .1249 to .1247. The housing should be .3750 +.0002 to .3750 –.0000 or .3752 to .3750.

When establishing shaft or housing sizes the effect of differential thermal expansion must be taken into account. If thermal gradients are present or dissimilar materials are used, room temperature fits must be adjusted accordingly. Approximate thermal coefficients for common materials are available from NHBB.

2023126 — 1. Strange Noises If you hear a consistent, rhythmic noise that sounds like growling or humming, it's a strong indicator of a bad bearing.

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If the outer ring or inner ring face will be clamped or abutted against a shoulder, make sure the shoulder configuration provides a good mounting surface:

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Accurate shaft and housing fits are important for proper bearing installation and operation. In ordinary applications, miniature ball bearings are used with a light load, so a light interference fit to a narrow clearance fit is usually sufficient. Light cross section bearings, such as Torque Tube and Thinex bearings, are more sensitive to shaft and housing imperfections and require looser fits than heavier cross section bearings.

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When miniature and instrument bearings are interference fitted (either intentionally or as a result of thermal gradients) the bearing radial play is reduced by an amount equal to approximately 80% of the actual diametral interference fit. Thus:

Fittolerance

Below the caution statements are recommendations for shaft and housing fits for a number of different applications and a table of recommended shoulder diameters for select NHBB part numbers.

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