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G391 Incremental position command
Haas NGC G-code · Lathe
Makes axis words a distance from the current point instead of a position.
Format
G391
How it works
Modal, group 03.
Example program
G391 (INCREMENTAL MODE)
G01 Z-.5 F.01 (MOVE .5 TOWARD CHUCK)
G390 (BACK TO ABSOLUTE)
G01 Z-.5 F.01 (MOVE .5 TOWARD CHUCK)
G390 (BACK TO ABSOLUTE)
Example is in inch. Check offsets and clearances first.
Watch out for
- Forgetting to go back to G390 makes every later X and Z incremental. Use U and W instead for single incremental moves.
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