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Specialized Configuration<br />
Sets of three or more bearings are sometimes used in special cases having requirements for<br />
increased stiffness or capacity, where the shaft or housing size cannot be changed to<br />
accommodate larger bearings. (See Figure 7.)<br />
Rigidity<br />
To achieve the best possible rigidity:<br />
Figure 9. Mounting the bearings in sets<br />
- minimise the distance between the front support position and the <strong>spindle</strong> nose.<br />
- bearing spacing (between rear and front supports) should be fairly short. As a guideline, a<br />
ratio l/d = 2,5-3 provides the best compromise, where are:<br />
l= distance between the rearmost bearing row and the first front side bearing row;<br />
d= bore diameter of the first bearing<br />
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