[joeavaerage]

Hi,
I use 750W Delta B2 servos on my mill. They are 2.4Nm (rated), 7.1Nm (overload), 3000rpm (rated). They are direct coupled to 32mm C5 BNFN double nut THK 5mm pitch ballscrews.
They can go up to 25m/min, and at standard tune do 0.27g with a 150kg axis. Why gear them down? Is there any need?

If you have 10mm pitch screws or higher....then yes.....you might want more torque, but with 5mm pitch screws you don't need any reduction to my way of thinking.

Craig