Nice,
Been messing with my speed/feed calculator, looking at all the figures i usually ignore

Mild steel,
50mm facemill with 5 tips, full-width cut, 1.6mm deep = 420rpm, 201mm/min, 0.4kW 9.24Nm
20mm endmill 4 flute, 35mm DOC, 5.4mm engagement = 650rpm, 204mm.min, 0.81kW 12.12Nm
15mm drill = 650rpm, 111mm/min, 0.37kW 5.5Nm
So using your quote of 0.3kw at 450rpm the answer is NO it will probably stall on a 15mm drill and a 20mm endmill but be ok with the facemill.
Yes, I *could* enter the actual power curve into the calculator and it WILL give me a solution BUT I think going lower power than a 1.5hp Bridgeport is a little pointless.
That clears that up then I think, forget the servo, if anything IS to be done it will be a 3Hp AC motor, sensorless-vector drive, braking resistor and encoder I think.
Thanks all for the patience
