Hi again

My X & Y axis are direct drive, using Oldham Couplings, the Milling head, gearbox & motor are quiet heavy, i am not to bothered how fast the Z axis travels, i am more interested in relieving some work on the motor, thats why i thought of using timing belt instead of direct drive, should i use 2:1 or 3:1 Should this be Driver to Driven or Driven to Driver?

Regards

Ray