Super Basic Question

That setup looks like a good one for a VFD. Look at the motor speed and determine what pulleys would give you your desired top end spindle speed at that motor rpm, then add the VFD to control it, leaving that as the 60hz speed. VFD will exceed 60hz, but it's no good practice, in my opinion. Lower frequencies will yield lower rpm; that's how they work. The only limit on lower speed is then the actual cooling fan speed on the motor. If you can't get low enough spindle speed with that pulley calculation, change it, but just don't plan on using it at above 60hz.

Other opinions welcome.
 
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