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# 10.6 Preparatory Words

Some G words alter the state of the machine so that it changes from cutting straight lines to cutting arcs. Other G words cause the interpretation of numbers as millimeters rather than inches. While still others set or remove tool length or diameter offsets. Most of the G words tend to be related to motion or sets of motions. Table 4 lists the currently available g words.

G0 | Rapid positioning
G1 | Linear interpolation
G2 | Circular/helical interpolation (clockwise)
G3 | Circular/helical interpolation (c-clockwise)
G4 | Dwell
G10 | Coordinate system origin setting
G17 | XY plane selection
G18 | XZ plane selection
G19 | YZ plane selection
G20 | Imperial system selection
G21 | Metric system selection
G40 | Cancel cutter diameter compensation
G41 | Start cutter diameter compensation left
G42 | Start cutter diameter compensation right
G43 | Tool length offset (plus)
G49 | Cancel tool length offset
G53 | Motion in machine coordinate system
G54 | Use preset work coordinate system 1
G55 | Use preset work coordinate system 2
G56 | Use preset work coordinate system 3
G57 | Use preset work coordinate system 4
G58 | Use preset work coordinate system 5
G59 | Use preset work coordinate system 6
G59.1 | Use preset work coordinate system 7
G59.2 | Use preset work coordinate system 8
G59.3 | Use preset work coordinate system 9
G80 | Cancel motion mode (includes canned)
G81 | Drilling canned cycle
G82 | Drilling with dwell canned cycle
G83 | Chip-breaking drilling canned cycle
G84 | Right hand tapping canned cycle
G85 | Bring, no dwell, feed out canned cycle
G86 | Boring, spindle stop, rapid out canned
G87 | Back boring canned cycle
G88 | Boring, spindle stop, manual out canned
G89 | Boring, dwell, feed out canned cycle
G90 | Absolute distance mode
G91 | Incremental distance mode
G92 | Offset coordinate systems
G92.2 | Cancel offset coordinate systems
G93 | Inverse time feed mode
G94 | Feed per minute mode
G98 | Initial level return in canned cycles

Table 4 G Code List

Tool diameter compensation (g40, g41, g42) and tool length compensation (g43, g49) are covered in a separate page. Canned milling cycles (g80 - g89, g98) are covered in their own page. Coordinate systems and how to use them is also covered in a separate page. (g10, G53 - G59.3, G92, G92.2)

Next: 10.7 Basic Motion and Up: 10. G Code Basics Previous: 10.5 Axis Words Contents Index