Centroid Community CNC Support Forum

Are there any pitfalls with using two servos to contribute to one axis of motion?

Example is one servo driving a milling quill downward and the second, driving the knee upward. Goal is maximizing available travel.

Centroid already supports dual servos for bridge mill / gantry type situations. Nice.

But this situation differs in that the proportion of travel may be different, e.g., available quill travel is 6" and available knee travel is 12".

Centroid supports axis summing. I.e. if you set the Z DRO to zero and move the quill down 3", the DRO will read Z-3.000. Then if you move the knee down 2", the DRO will now read Z-1.000.

The Quill is Z, the Knee is W. You will actually need two axis drives for this, and two encoder inputs.

Ah. Perfect. Thank for the clarity in that. Seems like half the battle is getting the terms right; "axis summing", in this case.