Quote Originally Posted by Jerry Bruette View Post
I don't understand why the single phase motor would have a sudden drop in RPM's...
The big-brain folks haven't weighed in, but I would assume that as the planer is stopped and initially begins slowing, the run winding is a 'generator' load. When it slows further, the centrifugal switch closes, the start winding and the start capacitor are connected back into the circuit - but now as (sudden) additional LOADS on the inertia of the cutter. System slows down (suddenly)?

I still think the sheave's ctr-ctr distance, belt's rigidity/flex/stretch/slack, and the above change in load all combine for belt slap - - and 'un-wrap' ( I'm paying attention, Mr. Coers). I'm just not sure about the most efficient fix.