What is a CAM Post Processor?

A CNC post processor is an essential piece of software that enables you to take the toolpaths you create in a CAM system and transform them into NC programs that your CNC machine’s controller can read. Most CAM systems are machine-independent, which allows you to program your parts regardless of the machine they will be made on. The toolpath data from the CAM system generally only contains the information required to move the cutting tools along the programmed toolpaths, without considering what the machine needs to begin or end the job.

This toolpath data must be converted into the exact dialect of G-code used in your machine. This is where the post processor comes in. The post processor reads the toolpath data from your CAM program and converts it into an NC program that your machine’s controller can understand. In doing so, it ensures that the NC program (usually G-code) is formatted correctly for your machine’s controller.

A good post processor should be tailored to your specific CNC machine and generate edit-free G code programs, including:

• Motion commands (both cutting and rapid moves)
• Tool changes
• Spindle control
• Coolant control

A well-designed post processor helps to ensure that your machine moves the cutting tool along the programmed toolpaths in a safe, consistent, and predictable manner, free from the potential for mistakes from hand edits.

MeshCAM includes post processors for all of the common CNC mills and CNC Routers, and custom post processors are easy to add.