Hi Guys, I have a y motor that only moving in one direction regardless of the command. the Mac3 screen is working correctly but every time a Y command is given (+ or - Ve) the motor only rotate in the + direction Can Anyone Help. Also How do you jog the 4th axis in MAch 3 Mill froom the keyboard. I cannot seem to find the shuttle screen as in the manual.

Sounds like your either have the wrong pin asigned in Mach for the Dir signal to your Y axis or the wiring is faulty or the port or breakout is not passing the sinal.
Press the Tab key and you will get the pop out screen for jogging.
Hood