The quest for a clear reference for Hemingway’s assertion continues …
I can, however, quote this verbatim from page 26 of the fifth edition of ‘Testing Machine Tools’
[quote]
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(2) Axial slip.
We have to distinguish between axial (or end) play and axial slip of a spindle. End play means the indispensable freedom of a spindle moving in the axial direction to prevent it from seizing by heating. This end play, specially on high – speed machines, should be within the specified limits and uniform running.
Axial slip (axial sliding motion) is defined as the axial spindle movements which may repeat positively with each revolution as a consequence of manufacturing errors. It is only this axial sliding movement that is to be tested, and the specified tolerances apply only to this movement. To measure axial slip correctly, the spindle must be forced in one direction by an applied axial thrust to ensure that the end play remains the same throughout the test.
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Please note Dr. Schlesinger’s careful distinction
MichaelG.