The word “Opposing” has me confused.
Do you mean one spinning CW and the other CCW, or (more commonly) do you want to “mirror” two steppers for a single axis (both spin the same direction and number of steps in sync).
this is a great question that I do get asked from time-to-time, I’ll need to add it to the FAQs.
Here’s the deal, you CAN NOT put two stepper motors onto one driver chip.
Here’s how it’s done – for the sake of this discussion, let’s say you have two motors driving your Y-axis gantry:
Connect one stepper motor to the “Y” axis output
Connect the second motor to the “A” axis output (one motor, one driver chip)
Your CAM software should allow you to define what pins are the step-and-direction for each axis. Configure the Y axis step and direction to BOTH the Y and A inputs.
If you want that second motor to spin the opposite direction, then, in your CAM software where you just assigned the Y outputs to the Y and A axis, select the option to invert one of the direction signals.