M4 Coordinate System

[CPL]

@CPL

Does the X axis always pass through the two bottom anchors?

And here’s another

@bar

Yes, I can absolutely test that. I just placed some anchors on the floor in a not even remotely rectangular pattern so we should have a good test case there.

@dlang

however, I am concerned that it assumes that tthe ‘bottom’ two are exactly horizontal to each other. I think there needs to be a (probably optional) step to correct for skew of the workpiece to the reference anchors.

The key here is that ANY two points can be said to define a line (that’s sort of the definition of a line) so we aren’t assuming that they are exactly horizontal, we’re saying that they define the line in the X-axis. You are right that it will have the result that when we cut a straight line in the X axis on the wood it will be parallel to the line defined by those two anchors which may or may not line up with the floor.