Configuring and Homing dual Y Axes

1. Over the winter I modified my DYI Router Mill adding a tandem Y axis and rebuilding my Z axis support with a 2-DF gimbal  to true the spindle to the table. Today, I attempted to home the machine however, when the Y axes homed, one triggered before the other causing LCNC to complain about not being able to home one axis while the other is moving off the the home position.

What the the best way to resolve this issue such that both axes travel together, both for homing and moving off the home switch.

2. Using PNCCONF for configuring LCNC with tandem Y axes, when testing the Y axis only one of the steppers responds. Is there something that I missed in PNCCONF that will allow both Y steppers to be tested together?

3. What is the .ini PARAMETER that tells LCNC that two axes are in tandem?

Kind Regards,

In your INI file look for a KINEMATICS entry. Change XYZ to XYYZ to tell it you have two Y joints. Further down you end up with [AXIS_Y] but [JOINT_1] and [JOINT_2]. PNCCONF should have set this up for you.
The other important thing is that the two Y motors can't share a homing sensor input. You can share X and Y1 or Y2 and Z but not Y1 and Y2.
You may also need to reverse the rotation of one of the Y motors. How you do this depends on your hardware, of course.

Posting your hal/ ini files would help to pin down the issue.