I was plan to build 5'x 9' cnc router 3 axis table with Racks & Pinions for x,y screwball for z. I need some advice for pitch size for my rack, want smooth cuts but want speed too from the x,y axis. How best to handle this? go with 20 pitch, about 20 tooth pinion, 20 degree pressure angle, giving nice smooth
travel then gear boxing it to get speed?
What ratio is common for x,y for this pitch size?