Sync. motor modifications


  Does anyone know a general rule of thumb, or other information on how much 
metal to remove on the armature of an induction motor for optimal sync. 
operation?   In the past I have simply removed an amount using the "just 
about right" rule and checked  for proper sync. operation.   I have a new 2 
HP 3450 RPM motor and want it to run it sync. with the least amount of metal 

Kevin Eldredge