I have to rework 25 little heat sinks to make the clearance pockets the
proper depth relative to the mounting pads.  They were all done about 0.018"
too shallow.
The depth from the reference surface pads is 0.140" but even those pads were
not accurately machined and so may be as much 0.010" shorter than they
should be relative to the larger flat surface.
 
Don't know if any of that makes sense but I've attached a sketch.
 

 
The generated G-Code is pretty simple and uses the initial cut layer as
0.120" from the zero reference which are the pads with a 0.020 depth of cut
creating my overall 0.140" depth from the pads surface.
 
I'd like to be able to add to the generated G-Code a 
T99 M06 G43
Then G0 X__ Y__ from the tool change position to one of the pads to set that
pad surface as Z=0
G1 Z__ F20 to be about 0.25" from the top of the pad
And then do the equivalent of tapping the "Probe Surface"     on the PSNG
Probe Screen to set Z=0.000
 
Finally the rest of the CAM generated G-Code starting with the 
T10 M06 G43
.
 
 
How does one link in that touch off code?
 
Thanks
John
 
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