mtt.tr
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But what HP is your mill to start with?
Plus facemills don't really need as much power as you think they do, unless you're taking a big bite.
To give some idea of power required, a quick run feeds and speeds calc with an 80mm 8 flute indexed facemill taking a full width cut at 1mm DOC in hot rolled steel, feeding at 300mm/min, only needs just under a HP with a constant torque of 31.3Nm.
The big benefit of a vector drive is they monitor how the motor is reacting to the voltage/current that is applied, and can maximise performance of the motor. They don't necessarily give you more torque than a conventional VFD, but they can run motors more smoothly at low speeds, and compensate when it sees the motor slowing, so it can give the impression of having more torque than a conventional VFD that simply outputs the desired frequency/voltage/current blindly.
The issue the OP has, is it's only a fractional horsepower motor to begin with.
A 1/3HP you could probably stall with your hand, running at anything below half speed.
You take a v/Hz only vfd and drop the Hz down to 5hz you can stall them with hand presure
I think couple of people are reading / adding there own interpretations of what I'm saying