Hello friends,
I've been busy converting a G0704 to CNC, and I've run into my first real issue. The scenario is this. I zero the z axis in g54, command a g00 z-1.0, the head moves exactly one inch down. However, I then enter a g00 z0.0 and the head moves up by aprox .960". Soooooo, I reenter the g00 z-1.0, the head moves back to exactly one inch below the g54 offset... I don't suspect backlash here, because the repeatability in negative travel. Any ideas??
PS I'm using Mach 3, and NEMA 34 steppers with 5mm pitch TBI ball screws.