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I work with this crap every day.. so I'll make it simple...
HP is directly related to the strength of the motor, the larger the motor the less strain, but larger motors also use more energy which is the amps everyone is talking about, most modern motors are energy effecient,and amp problems most often occur when dealing with blower units and fans, not motors driving pumps or a reduction unit ( lathe head stock)...the only thing you need to concern yourself with amp wise, is the amount of items on that particular circuit...... each item draws a specific amount of current (amps) too much and the breaker will pop( it's like trying to get too much water through a small tube or hose, it has it's physical limits)...in most cases your shop vac will draw more current than your midi lathe...
I have had a turn crafter for several years now, I love it,last year I converted it to variable speed, I love that too, the only thing I'll say about the VS, is that on occasion, you need to blow the dust out of the motor brushes or the motor speed becomes erratic.. not a big deal, just routine maintenance..no biggie for me seeing that is how I make my living...
Speaking of all this, I'm in the process of replacing bearing in a coolant pump on a hardinge lathe right now, the bearings are causing the motor to over heat and over amping the circuit and trip the relay...
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