But you then have the belts when you need to change ranges to get RPMs into the stratosphere for Aluminum, or much lower range (and torque) for larger face mills and the like. You can then use the VFD for most of your speed control, say for running a typical range of EMs in steel. Keep the belt drive for when you need it, and mostly keep it set in your typical range. In that size, it was just not financially feasible. As I recall I could keep almost the same low rpm power and a top speed of something like 1800 rpm, but I had to use a 5 hp motor and a high end "sensor-less vector" (or similar) VFD. But I wanted to keep the same low rpm and associated torque, I had already stalled it more than once so couldn't afford to give up any on the low end. I wanted to eliminate the Reeves Drive and use a VFD. I did some calculations years ago on repowering my Rockwell 11 that has a 1 hp motor and top speed of 1500 rpm.
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