Howto Control 4 Motors Per Z-Axis

Any thoughts on how to control 4 motors on a z-axis as in the machine in the picture?


www.3dprintingmedia.network/wp-content/u...79B30-1832x1374.jpeg

forum.linuxcnc.org/49-basic-configuratio...ltiple-slaves#160750 has a config for 4 motors on a Z-axis but I don't believe they are also controlling XY at the same time.

2.8 allows for 2 joints per axis. How to handle 4 joints per axis with a 3 axis platform that with only 1 motor per axis and would normally use simple kinematics?

Have a look at a tandem axis in hal add stepgens or pids and feedback as any other joint/axis, then in the ini file under the Z axis section add all 4 joints. Also in the ini file under the display ( not sure this is needed but it is there) section add XYZZZZ and same for traj section, and edit the number of joints.
That should work.

Agree, I don't think there is any limit to the number of joints that can be assigned to an axis, other than the maximum total number of joints available (16).

Looks like a fun machine. You should share some of your creations, once you've perfected it.

Sand casting printers for metals (Al, Fe, Steels, etc) and glass.

I did not think there was any limit to the number of joints (motors) on a single axis. Certainly none of the docs for 2.8 say its limited to two joints.

linuxcnc.org/docs/2.8/html/config/ini-ho...l#sec:homing-section

It was just the way it was talked about that 2.8 now supports gantries that use 2 motors, when in fact it supports more than just 2.