Excessive Spindle Play Fixed (newbie Error — I Didn't Need New Bearings)

Mike,

As a practical matter, you cannot preload by axial forces a single bearing.

On the subject of single-phase versus 3-phase motors and torque ripple, it is a fact that the torque ripple in a 3-phase motor is much smaller than with a single phase one. And the frequency is higher. If your purpose in going to 3-phase is only ripple reduction and not variable speed, there is an intermediate solution. A single-phase capacitor-start capacitor-run motor has less torque ripple than the more common capacitor-start one. The run capacitor drives the armature approximately in quadrature to the run winding. Whether it would solve a chatter problem or not could only be determined by trying it, though.
 
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