Hi Chris, for a CO2 laser it is a bad idea to have 2 separate motors drive a single axis - if they get out of sync it will send the beam where you really do not want it to go. A single motor with a shaft driving the rails on both ends is the correct way to do it.
That said, it is possible to slave A to Y driver if you need 2 motors. You would need to check the size of the motors to be sure it would work. Though as stated, we do not recommend doing this for a CO2 laser.
ok I under stand the risk of Skipping a step on one motor Thanks for the heads up. So How do I slave the a to the y . I have it working now with the both motors wired together I also set the amps to 1.2 on all three motors. Would it be better on the board to slave them instead of wiring together?