Twin Spindle / Twin Turret turning center

rexo wrote:

Two linuxcnc is probably the way but i can't find solution how to interconnect it and sending data from one to second. The only one function i found is linuxcncrsh for commanding linuxcnc over network.

I think that this would be best done with a custom setup where the controllers toggle dedicated GPIO pins that are read/written by G-code.

So, start with a list of what each controller needs to know about the other.

For example I would dedicate a digital pin that would tell the secondary spindle to sync speed exactly with the primary one, and then make the primary spindle angle available to the secondary one to use as a target for a position PID.

But, first of all, I would suggest making it work as a single-controller XZUW machine and use it for a while. That will help to realise what you need the machine to do, and give you a grounding in how to do it.

I don't think that a change in the tool offset should _ever_ cause an axis movement until the next programmed move.

What you describe could happen if the pid pins were connected to the wrong inputs and outputs, but the HAL looks conventional enough.

But, anyway: If an axis moves with just a change in tool offset (rather than just the displayed position changing) then something is wrong somewhere.