The availability of new spindle units which have hydraulically controlled variable preload bearings, means that the radial and axial deflection of bearings can be calculated more accurately than was possible when bearings had a preload set when cold and liable to change at working temperature. The present study gives the method of calculation for combined loading (i.e. axial and radial together), typical results are illustrated and the extreme cases of radial load only and of axial load only are compared with SKF's empirical formulae.
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