RC
I think 1KW with a 2:1 ratio would be fine.
On the Beaver I have motors that are rated 1.125KW but their torque is very close to yours being 3.39NM continuous and 4000 RPM rated. I am driving them 1:1 as I want the acelleration to be very good.
On the Y axis I have a bigger motor, not sure if it will be needed or not but its just what came along at the right price. In fact I am notr sure the motors I have will be big enough as I have not done real tests yet but theY do move the axis along nicely so I am hoping they will be fine, if not I have the reduction option although I would like to avoid that
I am going to be using the SmoothStepper on the mill as with 2000count encoders I will be needing a much higher pulserate than the PP could hope to deliver, at full speed of the motors it will need a pulserate of 533KHz which is no problem for the SS. Even if I have to gear 2:1 thats only just over 1MHz which is still easy for the SS
I have the same style motors/drives on the lathe I did but bigger, then again its a big lump of a lathe and the saddle, cross slide, turret and toolpost probably weigh about 800Lbs, about half the weight of a series 1 Bridgeport
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Hood