Adding second X stepper to XYZ router

I have a homemade gantry router rig. Control is based on a Geckodrive G540, which was easy to set up with StepConf.

I've noticed some yaw problems on the X axis, so I have obtained all of the hardware needed to install a second identical leadscrew assembly. One leadscrew will drive the near-side (Y=0) side of the gantry, the other will drive the far side of the gantry. (Y=30") To my newbie eyes, It looks like this is referred to as a XYZX configuration. The G540 will make the hardware a snap.

Today my question is "where do I start" on the EMC configuration side? I see a few threads here relating to debugging XYZX gantries, but nothing that helps me understand the jumping-off point, some general context in 25 words or less. I have a good software background, but I'm a total newb in this neighborhood. If someone can grab me by the shoulders and get me started in the right direction, it would be enormously appreciated. I really hate crafting square wheels when I suspect that perfectly round ones already exist.

if you add a second stepper to the axis you dont have to configure anything.
Just connect the dir / step pin from your PC to both stepper controllers.

I use the same basic set up that John spoke of.
Without a seperate homming switch for the motors I just push them aginst their stops before turning EMC on.
I used a standard set up and just edited the hal file to send the signals to two sets of parallel port pins, one for each Y motor, you can also invert the signal to one pin if needed.
There is more on this posted elsewhere on the forum.

Rick G

Thanks, guys. Your varied solutions provided just enough oomph to get me past my blind spot. The solution was so simple that I need to give myself a dope-slap.

The GeckoDrive G540 can control four steppers, right? X is on pins 2 and 3 of the parallel port. Y is 4 and 5, and Z is on 6 and 7. The fourth controller is on pins 8 and 9. I just set 8 and 9 to ALSO drive the X axis, let's call that X'. Works like a charm! DUH! I'm guessing it's all handled by the HAL. YAY!

Now back to the basement to bolt the assembled X' stepper assembly in place to see what we get.

AH, now THAT is the exact info I was looking for. Thanks, Andy!

Seems like Sunday is EMC day. I just now got the second X joint to work, using the simpler approach I mentioned in my last post. I'm tickled pink with THAT small accomplishment. I have a short-deadline project back on the rails now, one that only requires woodworking-level tolerances.

Homing and limits are definitely in order soon, I certainly don't like sound of steppers pushing against a hard limit.