I'm trying the G38.2 z-probe in an ngc call.  I keep getting an error "Probe 
move on line 6 would exceed joint 2's negative limit".

Problem seems to be that G38.2 uses the current coord system.  I've got the 
Z-home working now, and machine coords knows the furthest it can go, whereas 
the active coord system Z-value is meaningless for a max probe target.

I tried to prefix the G38.2 with G53 (machine coord operation), but I get an 
error that G53 only works on G0/G1.

Am I looking at the problem right?  How can I make this "probe to a fixed 
machine coord point"?

Danny

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