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This program detects the outside lower left of the part in the XY plane.
First, position the part so the probe tip is to the left (-X side) and down (-Y side)
of the part's corner, with the Z height at the level you want the probe to touch the part.
The program will back away 0.05 units in X and move 0.2 units in +Y to be across from
the -X face of the part, and then move in toward the X side of the part up to 0.5 units,
or until the probe touches. It then backs out .02 units and tries again at a slower speed.
The #1001= line computes the actual coordinate of the edge, the +.0763 is to adjust for the
probe tip radius. The same logic is repeated for the Y axis, and then the probe is lifted
.3 units in Z and the probe is brought to center right over the XY coords that were computed.
Then, G10 L20 P1 is used to set the G54 coordinate system to that value.
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(probe LOWER LEFT)
g91 g1 F10 Y0.2 X-0.05
g91 G38.2 X0.5
G91 G1 F10 X-0.02
g91 G38.2 F1 X0.1
#1001=[#5061+.0763]
G91 G1 F10 X-.1
G91 Y-.4
G91 X0.4
g91 G38.2 Y+0.5
G91 G1 F11 Y-0.02
g91 G38.2 F1 Y0.1
#1002=[#5062+.0763]
(debug,X,Y #1001 #1002)
G91 G01 F10 Z.3
G90 G01 F10 X#1001 Y#1002
G10 L20 P1 X0 y0
M02
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