[Dave's_Not_Here]

Gerry...

Following that same thought, what do you think about a 16mm +/- diameter X/Y axis with a lead in the range of 10mm to 20+ mm?

At what point do you feel the lateral or horizontal movement (speed) from a high lead screw begins to compromise the accuracy/resolution? Can the lead be "too fast" assuming feed rates, depth of cut, etc. are adjusted properly for the lead?

Seems there should be a margin where the benefits of a high lead screw's speed and the torque from slower motor speeds will intersect with the accuracy/resolution... (given a tight zero backlash ballnut, etc...)

Dave...

Added info:

Here is an example...