With the absence of data to tell me what the forces would be from pushing an Nmm diameter bit with a Dmm depth of cut through wood at Xmm/s it's difficult to know what level of torque would be sufficient for my application. I've seen a few comments indicating that 27Nm is good for a rotary axis, but that lacked data on what was being cut.
My motor is rated to 0.27Nm, and at 300:1 reduction (100:1 gearbox, plus 3:1 pulley), should in theory result in ~81Nm of torque at the spindle.