The G31 G-code is a tool length measurement (TLM) command used in CNC machining. It allows the machine to automatically measure the length of a tool and adjust its position accordingly.
How G31 Works:
- Probe: The G31 command instructs the machine to move the tool to a specific point, usually a probe, to measure the tool's length.
- Measurement: The machine probes the surface and records the distance between the tool tip and the measured surface.
- Compensation: The measured length is then used to adjust the tool length offset (TLO), which is stored in the machine's control system.
- Offset: The TLO is applied during subsequent machining operations, ensuring that the tool is positioned accurately relative to the workpiece.
Benefits of Using G31:
- Accuracy: G31 helps ensure that the tool is positioned correctly, improving the accuracy of machining operations.
- Efficiency: Automating the tool length measurement process saves time and reduces manual errors.
- Flexibility: G31 allows for easy adjustments to tool lengths when using different tools or changing tool lengths due to wear.
Example:
G31 Z0.0 F1000 (Probe to measure tool length)
G10 L2 P1 Z-1.2 (Set tool length offset to -1.2mm)In this example, the G31 command moves the tool to Z0.0 to probe the surface. The G10 command then sets the tool length offset to -1.2mm based on the measured length.
Conclusion:
The G31 G-code is a valuable tool for ensuring accurate tool length measurement and enhancing the efficiency and accuracy of CNC machining operations.
