John Thornton wrote: > > What spindle RPM does that give you? I assume 20% you mean the motor is > running at 350 or so RPM? > Hmmm, seems like I calculated something wrong. With the belts set for 2720 nominal RPM, and I call for 1000 RPM, that is 37% of nominal speed, and the motor would be running at 662 RPM. This allows the motor to reverse more easily, which I do a lot of when rigid tapping a bunch of holes. > On mine the motor doesn't like going over 1800 RPM so I have to change > the vari-speed from 500 at 30 Hz to 2000 at 60Hz to drill. > I change the belts to get close to the desired spindle RPM at nominal motor speed, except for rigid tapping. I can overspeed the motor, but generally don't. The only time I might do that is when drilling with tiny carbide drill bits.
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