Pocket milling is a fundamental CNC milling operation where material is removed from a cavity or recessed area in a workpiece. Writing accurate G-code for pocket milling ensures precision and efficiency in your machining process.
Step 1: Define the Pocket Dimensions
Before writing G-code, identify the pocket's width, length, and depth. For example, a 50mm x 50mm pocket with a depth of 5mm.
Step 2: Set Up the CNC Machine
Ensure your CNC machine is calibrated, the workpiece is securely fixed, and the correct cutting tool is installed. Using the correct spindle speed and feed rate is crucial for smooth pocket milling.
Step 3: Write the G-code Example
G21 ; Set units to millimeters G17 ; Select XY plane G90 ; Absolute positioning G0 Z5 ; Move tool to safe height G0 X0 Y0 ; Move to pocket start position G1 Z-5 F100 ; Lower tool into material at feed rate 100 mm/min G1 X50 Y0 F200 ; Cut along X-axis G1 X50 Y50 ; Cut along Y-axis G1 X0 Y50 ; Cut along X-axis back G1 X0 Y0 ; Complete pocket perimeter G0 Z5 ; Retract tool M30 ; End program
Step 4: Test and Optimize
Always simulate the G-code in CAM software or run a dry run on your CNC machine to verify the toolpath. Adjust feed rates and cutting depth as needed for optimal results.
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