(Surface measure macro)
(Tool is placed somewhere above the surface sensor)
(#5490 - Surface Sensor Width)
(#5496 - Sheet material thickness)
G28.2 Z0 (save current Z into Register1.Z)
M88 L1 P6 (watch for input(P) pressed(L1))
G91 G0 Z-100.000 F  20.0
(move down, stop if sensor triggered)
G4 P0.05
M89 L0 P6 (watch for input(P) released(L0))
G91 G0 Z 100.000 F  20.0
(move up, stop when sensor triggered)
G4 P0.05
G90 G10 L70 P#5220 Z [ #5490 - #5496 ]
(set current work position as 0, depends on surface sensor width & sheet thickness)
G4 P0.05
G90 G0 Z30.000000 F1000.0
(move up to safe height- absolute)
