I'm brand new to this, but I've searched through most of the threads and haven't seen my problem yet, which is that my Z-axis is running backwards when I run the programs (it seems right according to the keypad---upper key makes it go up, lower key down when jogging). Before I try to get my over-size hands into the cabinet to move wires, is there a software solution that will reverse the motors? I have all three motors hooked up the same, and Y and X seem fine, although, to be honest I don't know that these would make such a great difference. Z matters because when the spindle should plunge it retracts, and vice versa.

If moving wires is the only solution, do I reverse the pairs, or reverse all wires? In other words, if I have black/green/blue/red now, do I go blue/red/black/green, or red/blue/green/black? (forgive me, I'm a Mechanical Engineer, not Electrical)

 

Hello, you can usually go into your CNC controller settings and reverse the axis, I use Mach 3 and here is a pic of my settings! I am running the MK II with the under mount gantry. Hope this helps!
John Attached files

 

Thanks for the help. I did manage to reverse the Z-axis through the settings. I think I failed to hit "okay" the first time I tried it, so it didn't actually take. Still can't get the program to execute with the spindle running, however. I did try the surge suppressor suggested elsewhere, but no luck.