i have some worn A-belting... its starting to fray :lol: yes I can take the motor higher on the VFD but not from 2150 -> 5000 using the same pulley set. You can over rev the motor maybe 10 - 15% say 2500, but what I plan to do is put a new small fixed pulley on the motor and run a single belt (with an idler to get round the column) using the largest pulley on the spindle.