Comprehensive Bridgeport G‑Code Reference for CNC Milling
Complete Bridgeport G code list for cnc machinists who work on cnc mill.

Bridgeport CNC Milling Machine
Bridgeport Mill G Codes
| G code | Description |
|---|---|
| G00 | Rapid traverse (Programmed feedrate remains in register) |
| G01 | Linear interpolation (Feed in a linear path) |
| G02 | Circular interpolation CW. Arc |
| G03 | Circular interpolation CCW. Arc |
| G04 | Dwell |
| G08 | MODAL Deceleration override OFF |
| G09 | MODAL Deceleration override ON |
| G12 | Helical interpolation CW |
| G13 | Helical interpolation CCW |
| G17 | X Y Plane selection |
| G18 | ZX Plane selection |
| G19 | YZ Plane selection |
| G22 | Circular interpolation, Fillet input CW |
| G22 | Circular interpolation, Fillet input CCW |
| G30 | Mirror image OFF (Cancel symmetry) |
| G31 | Mirror image X ON (X symmetry) |
| G32 | Mirror image Y ON (Y symmetry) |
| G40 | Cancel compensation (Cutter diameter offset OFF) |
| G41 | Cutter compensation left |
| G42 | Cutter compensation right |
| G44 | Cutter compensation, Normal feedrate |
| G45 | Cutter compensation, Modify feedrate |
| G70 | Input inch (Select Inch dimension system) |
| G71 | Input millimeter (Select metric dimension system) |
| G72 | Transformation OFF (Cancel transformation) |
| G73 | Transformation / Rotation, Scaling |
| G74 | Multi quadrant circle input OFF |
| G75 | Multi quadrant circle input ON |
| G77 | Facing cycle (Zig zag mill cycle) |
| G78 | Pocket milling cycle |
| G79 | Bore mill cycle (Internal hole mill cycle) |
| G80 | Fixed cycle cancel |
| G81 | Drill cycle – Z cycle, drill (feed in, rapid out) |
| G82 | Spot facing cycle (with dwell) – Z cycle, spot face (feed in, rapid out) |
| G83 | Deep hole drill cycle – Z cycle, deep hole (peck, rapid out) |
| G84 | Tapping cycle (need reversible tapping head) – Z cycle, tap (feed in, feed out) |
| G85 | Boring cycle (use for reaming) – Z cycle, bore (feed in, feed out) |
| G86 | Boring cycle – Z cycle, bore (feed in, stop-wait, rapid out) |
| G87 | Chip breaking cycle (backs up .05 then returns .05) – Z cycle, chip break (peck, rapid out) |
| G89 | Boring cycle – Z cycle, bore (feed in, dwell, feed out) |
| G90 | Absolute programming (Absolute input) |
| G91 | Incremental programming (Incremental input) |
| G92 | Preset part programming zero point |
| G96 | Restore base part programming coordinate system |
| G97 | Set work coordinate system |
| G99 | Deceleration override |
| G170 | Outside frame mill |
| G171 | Inside frame mill |
| G172 | Pocket frame mill |
| G173 | Outside face mill |
| G174 | Inside face mill |
| G175 | Outside circle mill |
| G176 | Inside circle mill |
| G177 | Pocket circle mill |
| G179 | Slot mill |
| G181-G189 | Z cycle (same as g81-g89) multi-hole |
| G191-199 | Z cycle (same as g81-g89) frame of holes |
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