Lathe with 2+2 axes + servo spindle + live tool???

machete wrote:

1. Is it possible to control two pairs of ZX axes in Linux CNC (somehow)?

Yes. They would be controlled in the G-code by XZ and UW axes.

Is it possible to control C-axis in "lathe mode"?

Yes, though a certain amount of clever configuration will be needed.

Is it possible to control two spindles in Linux CNC?

Yes, but I don't know if it can be done conveniently. Do you anticipate the two spindles every turning at different speeds? Do you want to do spindle-coordinated moves (such as threading) on the second spindle? It is a limitation of G-code that the S-word is immediate, it doesn't wait for any clue as to which spindle you mean. You might end up controlling the second spindle with rather clunky M66 E0 Q800 commands, for example. I don't know if CSS or feed-per-rev would be available (they both happen accidentally if the two spindles are running in synch, such as when swapping parts from one to the other)

machete wrote:

But as i understand X and U is summing?

Not with the default kinematics.

The U-word in G-code just directly drives the axis.6.motor-pos-cmd pin in HAL and the W-word drives axis.8.motor-pos-cmd.

machete wrote:

Is it possible to have two servo loops (for two motors) one for speed, and one for positioning?

Yes. There is an example here;
www.linuxcnc.org/index.php/english/forum...stion?start=10#30946

machete wrote:

Thats great, but what will be with tool corrections on different tool-heads?

The tool table accepts offsets in all of XYZ ABC UVW.