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General Mach Discussion / problem with Z axis

« on: October 11, 2015, 03:29:57 PM »

Hi I'm new here and I'm trying to learn how to use my GreenBull 5x10 CNC machine. I speach french (Quebec, Canada), I'll try to do my best in english. I saw a lot of Youtube videos, ans I'm almost ready to cut. But I have problems with the Z axis. I set the motor tuning (usually it gives me 6400) but almost each time I try to run a G-code, when the tool go up, no problem, but when it goes down, it's always too much. So it goes 1/4" up, go down 1/2", goes up 1/4", goes down 1/2"... not exactly that, but it gives an idea...

When the table was assembled, X and Y axis were perfect, but the Z axis was working the reverse way, so when nI was pushing the Z+ button, it was going down. I took the motor and turned it upside down. Someone can help me please? I have a big contract soon and I need it!