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🛠 What is G-Code?
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G-code is the ISO-standard language used to control CNC machines.
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It defines tool motion, cutting operations, offsets, and cycles.
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M-codes complement G-code by controlling machine functions (spindle, coolant, tool change).
📑 Basic Program Structure
A CNC program begins with a safe start block to reset modal states:
% O1001
G90 G17 G40 G49 G80 G54
T1 M06 S3000 M03
G00 G43 Z100 H01
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G90 → Absolute programming
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G17 → XY plane selection
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G40/G49/G80 → Cancel cutter, tool length, and cycles
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G54 → Work offset
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M03 → Spindle start clockwise
🚀 Essential G-Codes for Beginners
| Command | Function | Example |
|---|---|---|
| G00 | Rapid positioning | G00 X0 Y0 Z100 |
| G01 | Linear feed motion | G01 X50 Y20 F200 |
| G02/G03 | Circular interpolation CW/CCW | G02 X60 Y40 I20 J0 |
| G28 | Machine reference return | G91 G28 Z0 |
| G43 | Tool length compensation | G43 H01 Z100 |
| G54–G59 | Work coordinate systems | G54 G00 X0 Y0 |
⚙️ Common M-Codes
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M03 → Spindle start CW
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M05 → Spindle stop
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M06 → Tool change
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M08/M09 → Coolant on/off
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M30 → Program end and reset
🔄 Drilling Cycles
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G81 → Standard drilling
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G83 → Peck drilling (chip breaking)
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G84 → Tapping cycle
Example:
G81 X20 Y20 Z-15 R2 F150
🤖 Modern Enhancements (2026)
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AI-assisted verification → Detects unsafe toolpaths before execution.
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Digital twin simulation → Virtual NC code testing reduces crashes.
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Macro programming → Enables decision-making logic (IF/THEN conditions).
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Cloud-based CAM integration → Remote teams can validate G-code collaboratively.
⚠️ Common Beginner Mistakes
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Forgetting to cancel cycles (G80) → Tool continues drilling unexpectedly.
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Wrong work offset (G54) → Silent scrap of parts.
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Missing tool compensation (G43) → Plunge crashes.
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Unsafe rapid moves (G00) → High crash potential.
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