CNC Programming

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Table Of Contents:
  1. G-code Table
  2. G00 - Rapid Linear Motion
  3. G01 - Linear Motion at Feed Rate
  4. G02 and G03 - Arc at Feed Rate
  5. G04 - Dwell
  6. G10 - Coordinate System Data Tool and Work Offset Tables
  7. G17, G18 and G19 - Plane Selection
  8. G20 and G21 - Length Units
  9. G28 and G30 - Return to Home
  10. G28.1 - Reference Axes
  11. G40, G41 and G42 - Cutter Radius Compensation
  12. G43, G44 and G49 - Tool Length Offsets
  13. G47 - Engrave Sequential Serial Number
  14. G53 - Move in Absolute Coordinates
  15. G54 to G59 and G59 P~ - Select Work Offset Coordinate System
  16. G61 and G64 - Set Path Control Mode
  17. G73 - Canned Cycle - High Speed Peck Drill
  18. G80 - Cancel Modal Motion
  19. G81 to G89 - Canned Cycles
  20. G90 and G91 - Distance Mode
  21. G92, G92.1, G92.2 and G92.3 - G92 Offsets
  22. G93, G94 and G95 - Set Path Control Mode
  23. G98 and G99 - Canned Cycle Return Level 
Program: G80 to ensure no axis motion will occur, to terminate canned cycles etc. Note that it cancels the current G0, G1, G2 or G3 mode so this must be re-established for the next move that is requited. This particularly affects people adapting a CAM postprocessors from another machine as this behavior varies between different CNC controls.
It is an error if:
  • Axis words are programmed when G80 is active, unless a modal group 0 G-code is programmed which uses axis words.
  • G80 Example
    (Sample Program G80EX17:)
    (Workpiece Size: X4, Y3, Z1)
    (Tool: Tool #5, 5/8" HSS Drill)
    (Tool Start Position: X0, Y0, Z1)

    N2 G90 G80 G40 G54 G20 G17 G50 G94 G64 (safety block)
    N5 G90 G80 G20 (Canned cycle cancel)
    N10 M06 T5 G43 H5
    N15 M03 S1450
    N20 G00 X1.0 Y1.0
    N25 G81 Z-0.5 R0.125 F10.0
    N30 X2.0
    N35 X3.0
    N40 G80 G00 Z1.0 (Canned cycle cancel)
    N45 X0 Y0
    N50 M05
    N55 M30


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