Y axis A slave help request

My machine is using the Y and A motors off a parallel port breakout board. I went thru the step config wizard and set up X, Y, and Z configuration and included the A motor pins while doing so. Im really not sure how to proceed as I need Y and A to both home at the same time? Does anyone have a solution for this application?
 Thanks in advance for your help and support!

Quarter20

Something like this should work:

 


You may need to invert one direction
and I'm not sure if you have home switches.
( Gantry homing typically takes 2 home switches )
 

What version of LinuxCNC?
Does it have "tandem N axis" as a choice?
Use that if possible, there are no slaves in LinuxCNC.
Just checked and 2.10 has those choices.

Ahh, that may be a master only option for stepconf and not in 2.9.4

If stepconf is standalone (I think it is) you should be able to just use the latest:

 

( rename to stepconf and chmod +x stepconf )

Thanks for your help I was able to find the tandem axis for Y. I am still not sure how I will get both joints to home at the same time?

When you say the latest, do you mean a newer version than the 2.9.4? I just downloaded it a week ago, do you have a suggestion where to get a newer version? Thanks for your help.

The stepconf in 2.9.4 does support gantries (tandem axis)

Is it just about homing sequences? Or do you need to keep a fixed ratio for the axis?

My Router has a motor on each side of the Y axis running a 16mm ball screw fixed to each side of the gantry (Motors Y and A). The motors will always be required to jog and home together in synchronicity. If I try to home or jog either of them, the gantry will rack. When I get an error for trying to jog either axis it says : " Cannot jog joint because home sequence is synchronized". Is there a way to jog Synchronized? Is that a setting in my step config I have overlooked? Should I be doing an XYZA type of step config vs, the XYZ step config choice? Thanks again for your help and support. I am going to dig into the documentation further.

 

Jogging  a joint is not allowed (because it will rack the gantry)

You can jog the Y axis but only after homing is complete.
So if you don't have dual homing switches you need to setup immediate homing

Also unless you have a rotary A axis, there should be no mention of A anywhere
It would be a lot less confusing to refer to the Y Axis as Y and Y1