I have recently connected my 3 axis CNC to Mach3 via 3 TB6600 drivers and a ST-V2 BOB. Everything is wired up correctly and Mach3 Config has been entered as per BOB installation instructions.
However, the Y axis motor changes direction at random with each activation of the jog command, either by hot key or from within Mach3. i.e when I press the Y+ command, the motor will start in any direction; Y+ or Y-. The next time I hit the Y+ command again, the motor might run in the opposite direction. The DRO however will continue to clock as if the motor is running in the Y+ direction. The same occurs with the Y- command but the DRO will continue clocking in the Y- direction. This problem initially happened only to the Z axis motor, but that seems to have resolved itself mysteriously and now occurs only to the Y axis. Both X and Z axes' motion are stable.
I have ruled out the TB6600s and the BOB by interchanging the Drivers and BOB axes pin connections, and changing the Motor Outputs pin values in Mach3 Config accordingly. It does not matter what channel I establish between Mach3 and the motors, the Y axis jog commands can not assure direction.
My computer's O/S (Vista) was reinstalled + memoryoveride.zip, as was Mach 3 (R3.043.062) and I also addressed the blue question mark after the Mach3 driver in 'Device Manager' with the fix in
https://www.machsupport.com/forum/index.php?topic=38269.0. The blue question mark remains.
I've attached the xml file.
Do any of you have any suggestions?