Subtraction cutting, also known as negative cutting, is a technique used in CNC machining to remove material from a workpiece by subtracting it from a predefined shape.
How Subtraction Cutting Works
- Design: The desired shape is created using a CAD program.
- Toolpath: A CNC program defines the path the cutting tool will follow.
- Cutting: The cutting tool moves along the defined path, removing material from the workpiece.
Examples of Subtraction Cutting
- Milling: A rotating cutter removes material from a workpiece.
- Turning: A single-point cutting tool removes material from a rotating workpiece.
- Drilling: A drill bit creates a cylindrical hole in the workpiece.
Advantages of Subtraction Cutting
- High precision: CNC machines can achieve very precise cuts.
- Repeatability: The same program can be used to create multiple identical parts.
- Efficiency: Subtraction cutting is a highly efficient way to remove material.
Disadvantages of Subtraction Cutting
- Waste: Some material is always wasted during subtraction cutting.
- Tool wear: Cutting tools can wear down over time.
- Setup time: Setting up a CNC machine can take time.
