I have a Nema23 that has a 1.8 degree stepping resolution. The motor has a GT2 pulley attached on the rotating element. This GT2 pulley is coupled with another pulley, using a belt, which is directly around the shaft of a lead screw.
I'd like to increase my stepping resolution, I already use micro-stepping, so I was thinking of using a 60 tooth pulley on my lead screw and a 20 tooth pulley on the stepper. Such that a step from my motor would result in less rotation of the lead screw. But what I am curious about is how will this affect the torque experienced by the motor? Will I be able to lift the same load, or maybe even more? Are there any drawbacks to such a modification?