hi, I'm looking for some advise on my cnc that I just built. This is the first one i'v made or used and know very little, even if this a good forum for a novice. i'v made a bench top, sized router cnc with nem 17 motors, using a garble shield to drive it at 1/8 th micro steps.My problem is my z axis motor looses steps (quikly) so i'm thinking I have to light of gear carrying the weight of the router. Before I buy new gear I was wondering if the stepper should have some "holding torque" when not stepping? it can heave the router around quick but not hold it on a plane.Any advice would be appreciated . thanks.