What is a postprocessor?

A postprocessor is a term often used in the context of computer-aided design and computer-aided manufacturing (CAD/CAM). It is a software program or part of a software package that is used to convert the data created in a CAD/CAM system into specific instructions or code that a Computer Numerical Control (CNC) machine can understand.

When a product is designed using a CAD system, geometric models and design information are created. However, this information is not directly understood by the CNC machine. The postprocessor plays a crucial role here: it translates the design information into the language that the specific CNC machine can interpret and execute.

Each CNC machine has its own control system and specific codes that determine the machine's movements and operations. The postprocessor must take into account the machine configuration, tool libraries, cutting parameters and other machine-specific properties to generate the correct instructions.

The process of postprocessing usually involves the following steps:

1. Analysis of the CAD/CAM file: The post processor reads the data and geometry created in the CAD/CAM file.

2. Conversion to Machine Code: It translates the design information into the machine code that the CNC machine can understand, such as G-code or M-code.

3. Optimization (optional): Some postprocessors can perform additional optimizations to improve machining efficiency, such as minimizing tool change times, optimizing tool paths, etc.

4. Output to CNC Machine: The generated machine code is then sent to the CNC machine, where it is interpreted and executed to produce the physical part according to the original design.

Post processors are essential to ensure a smooth transition between designs in CAD/CAM software and actual production on CNC machines. It ensures that designs are converted into tangible products accurately and consistently.