Chapter 9. Bearings and Fit Tolerances
Chapter Objectives
• Learn about sleeve and ball bearings
• Learn about fits
• Learn how fits are applied to bearings and shafts
• Learn about tolerances for bearings
9-1 Introduction
This text deals with two types of bearings: sleeve bearings or bushings and ball bearings. See Figure 9-1. Sleeve bearings, or jig bushings, are hollow cylinders made from a low-friction material such as Teflon or impregnated bronze. Sleeve bearings may have flanges. Ball bearings include spherical bearings in an internal race that greatly reduce friction. In general, sleeve bearings are cheaper than ball bearings, but ball bearings can take heavier loads at faster speeds. A listing of ball bearings is included in the
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