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Well there's a problem. You don't know what you're looking at. Go to Google and type in "router speed control on my grinder", you'll find all sorts of smart fellahs saying not to do it. The other...

If you don't mind, can we see a link to the 30-50 dollar variacs? The only one I found for a single phase induction motor was $300.00. My very limited knowledge of VFD's comes from what I've read...

Seriously...Use pullies.

It's a single phase fixed speed induction motor. It's not meant to run at variable speeds. Any attempt at regulating the speed electrically is a fire hazard, and sure...

Ok, you can doubt it all day if you want. I already told you it is. :)

3450 is the revolutions per minute of the motor shaft, and yes technically that's also the RPM of the wheel. But it's not the Surface Feet Per Minute of the abrasive that's attached to the wheel. I...