What is the optimum resolution for a stepper driven axis?
In other words, turns per inch.

I have a stepper driven screw drive that is 1 revolution per inch.
Is that resolution good enough or should I plan on gearing it down with a pulley/belt ?

Also ... I'm working on another project that is toothed belt driven on a 48" axis.
What is the optimum stepper turns per inch that I should shoot for?

I will be cutting and engraving wood and foam not machining mill parts, if that makes a difference.