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3.0 BEARING SELECTION

Bearing selection represents a compromise among many factors including the nature of the applica tion, performance requirements and cost. A useful bearing-selection chart, which summarizes the principal considerations involved, has been given by A.O. DeHart and is reproduced in Table 1. For more details, which are beyond the scope of this presentation, the reader is referred to the  technical literature.

4.0 BEARING LOADS

The first step in sizing a suitable ball bearing for a given application is the determination of the loads which it has to support. In this section we list some of the most frequently occurring mechanical configurations and the bearing loads imposed by them

(a) Radial Shaft Load Between Bearings

P = radial load
R1, R2 = bearing load
l1.l2 = distance from
             Radial load to
             bearings
     R1 = l2P                                   (1)
               l1+l2
   R2 =     l1P                                 (2)
                l1+ l2
(b) Overhung Radial Load
Notation same as in paragraph (a).
R1 =      l2P                                        (3)
            l1+l2
R2 =    l1P                                           (4)
           l1-l2

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