Only one of the gantry joints move

Hello there!
I have recently mostly finished my CNC mill. It is a 3 axis moving gantry, with two motors on the Y axis.

After lots of troubleshooting and learning about linuxcnc, I finally (!) got all 4 joints to home.
I can jog X and Z as I should be able to, but with Y that's a different story: only one of the Joints moves during jogging.
After only implementing the 4 joints and declaring joint_1 and joint_3 as Y in the ini didn't work, I tried adding loadrt gantry [.....] . The syntax with this one is a hassle. About 3 hours later I got linuxcnc to post with it, only to find out that it didn't change anything at all.

I can later (got them on a thumb drive right now) post my .hal and .ini if that helps. Maybe someone knows an answer already.


Thanks to you all in advance!

Parallel port +bob. Mesa was too expensive for me for a proof of concept.

I found the gantry command (if it's called that) in the linuxcnc documentation, and thought that it might solve the problem.

Thing is: the problem stands with or without loadrt gantry. All the axis home, but only one of the ys moves while jogging.

So, now that I finally found time and access to a pc, I can share my .hal and .ini

I really appreciate any effort anyone puts into this.

Okay then, I'll try stepconf again.

Hoe would I then teach the machine to accept a as y2? As far as I'm aware, there's no setting in stepconf for that.

2.9.3 I believe. I just installed it a few weeks ago.

Setting tandem axes is done when homing. It is all covered in the documents under the heading "Homing Configuration"
You need to read it a few times before it sinks in.
each tandem joint needs a negative HOME_SEQUENCE