The z axis on my fadal cnc88hs at work is extremely sporadic. It doesnt help that i am only 2 months into this job. Any help will go along way. The company has been trying to figure out the problem for years and has had techs out multiple times. The z after the tool change rapids down and is always off, usually short of depth exspeacily with g83 end mill pecking. I have noticed when i slide hold after it rapids down to RO plane and manually move the z up and down and then return to axis the z is on point with cut/depth.