2 motors for the same axis

Can you go into Machine->Show HAL config and check the Signals
xpos-cmd, xpos-fb
apos-cmd, apos-fb?

Looking here:

linuxcnc.org/docs/html/man/man9/gantrykins.9.html

I wonder what this means, in practice?

In the inverse kinematics, each joint gets the value of its corresponding axis. In the forward kinematics, each axis gets the value of the highest numbered corresponding joint. For example, with coordinates=XYYZ the Y axis position comes from joint 2, not joint 1.

andypugh wrote: I wonder what this means, in practice?

This sort-of makes sense. There are two X-feedbacks from two (different) stepgens and only one can be compared to the internal X value.

Try short-circuiting the axis.0 feedback, like this: (ie comment out the stepgen and send the command back as feedback)

Hi,

I have a similar problem with axis definition.
I was able to configure a tandem axis (X or Y) in "world-mode".
Now when I define a "tandem-axis" the system sets directly the "joint-mode" and I cannot set it back to world-mode with view-panel.

does anybody know about some wrong settings somewhere ?

Can you please attach the hal and ini files so we can have a look ?

It has to do with the ohming

One time you perform the ohming for all axis the system turns into world-mode