In CNC machining, understanding the difference between Contour Milling and Pocket Milling is essential for writing efficient and accurate G-code. Both machining strategies are widely used, but they serve different purposes in material removal.
What is Contour Milling?
Contour milling is a CNC machining process used to cut along the outer or inner edges of a part. The tool follows a predefined path, usually defined by the part geometry. In G-code for contour milling, linear and circular interpolation commands such as G01, G02, and G03 are commonly used.
Contour milling is ideal for producing precise outlines, profiles, and finishing operations where surface accuracy is critical.
What is Pocket Milling?
Pocket milling is used to remove material from inside a closed boundary to create cavities or pockets. G-code for pocket milling often involves multiple tool paths, step-down movements, and overlapping passes to efficiently clear material.
This machining method is commonly applied in mold making, mechanical parts, and CNC components that require internal features.
G-code Comparison: Contour vs. Pocket Milling
- Tool Path: Contour milling follows edges, while pocket milling clears internal areas.
- Material Removal: Pocket milling removes more material in bulk.
- G-code Structure: Pocket milling requires more complex looping and depth control.
- Surface Finish: Contour milling provides higher edge accuracy.
Choosing the Right CNC Milling Strategy
Selecting between contour milling and pocket milling depends on part design and machining goals. By optimizing CNC G-code for each process, machinists can improve efficiency, tool life, and overall machining quality.
Understanding the differences between G-code for contour milling vs. pocket milling helps CNC programmers create better tool paths and achieve professional machining results.
G-code, CNC Milling, Contour Milling, Pocket Milling, CNC Programming, Machining
