Complete G-Code and M-Code Chart: Fanuc, Haas, Siemens, and More
Meta Description: Explore the most comprehensive and up-to-date G-code and M-code chart with cross-reference between Fanuc, Haas, and Siemens controllers. Perfect for CNC programmers and machine operators.
📚 Why a Unified G & M Code Chart Is Critical
Each CNC controller brand (Fanuc, Haas, Siemens, Heidenhain, etc.) may implement the same G or M code differently — or use a different code for the same function. Knowing these differences prevents errors, reduces machine downtime, and improves productivity.
🧭 G-Code Comparison Chart
Below is a cross-reference table comparing essential G-codes across Fanuc, Haas, and Siemens:
| Function | Fanuc | Haas | Siemens |
|---|---|---|---|
| Rapid positioning | G00 | G00 | G00 |
| Linear interpolation | G01 | G01 | G01 |
| Circular interpolation CW | G02 | G02 | G02 |
| Program stop | M00 | M00 | M00 |
| Spindle ON clockwise | M03 | M03 | M3 |
| Coolant ON | M08 | M08 | M8 |
| End of program | M30 | M30 | M30 |
| Return to zero | G28 | G28 | G28 |
| Thread cutting | G76 | G76 | CYCLE97 |
| Drilling cycle | G81 | G81 | CYCLE81 |
Note: Siemens frequently uses cycle macros (e.g. CYCLE81) instead of raw G-codes.
⚙️ Common M-Code Reference
| Function | Fanuc | Haas | Siemens |
|---|---|---|---|
| Program Stop | M00 | M00 | M0 |
| Optional Stop | M01 | M01 | M1 |
| Spindle CW | M03 | M03 | M3 |
| Spindle CCW | M04 | M04 | M4 |
| Spindle Stop | M05 | M05 | M5 |
| Coolant ON | M08 | M08 | M8 |
| Coolant OFF | M09 | M09 | M9 |
| End of Program | M30 | M30 | M30 |
📌 Controller-Specific Notes
- Fanuc: Strict modal group usage, uses G-code subprograms via
M98/M99. - Haas: Follows Fanuc but adds unique custom M-codes and macros.
- Siemens: Uses structured language cycles and dialogues instead of raw G-codes.
📈 Why This Knowledge Matters for Your Career
Whether you’re a CNC operator or CAM programmer, knowing how different brands interpret G/M codes helps you:
- Work on multiple machines without relearning every interface
- Debug controller-specific errors faster
- Build reusable post-processors for CAM software
📘 Downloadable Quick-Reference Charts
You can easily create laminated cheat sheets using the tables above or export them as PDFs for your tool cabinet, office wall, or digital tablet on the shop floor.
🔮 Future Considerations
As CNC controls move toward hybrid cloud-based and AI-supported systems, we’ll likely see greater unification in G/M-code interpretation. ISO 14649 and STEP-NC standards aim to create universal compatibility between platforms.
✅ Summary
This G-code and M-code reference isn’t just a lookup tool — it’s a bridge between controller brands. Save this page, print the tables, and elevate your programming across any shop floor you enter.
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