Mastercam Post Processor Editing Exclusive <VALIDATED>

Mastercam posts generally use the MP language. Modern posts consist of two main file types working together. The Component Files

Define how that data looks (e.g., number of decimal places).

Most generic posts (like MPFAN or MPMaster) include a section of "Switches" near the top. These are user-friendly variables (often bug1$ , bug2$ , top_map$ ) that change behavior without requiring deep code surgery. For example, turning a switch from 0 to 1 might disable coolant output for a dry-cutting operation.

: Identified by a "p" prefix (e.g., pheader , ptoolchange ), these blocks execute at specific points during the G-code generation process.

: The built-in editor specifically designed for viewing and editing Post Developer Kit (PDK) mastercam post processor editing

The post processor editing process typically involves:

pheader$ # Start of file program header "%", e$ *progno$, e$ "(PROGRAM NAME - ", sprogname$, ")", e$ "(DATE - ", sday$, "-", smonth$, "-", syear$, ")", e$ Use code with caution. 2. Enabling or Disabling Output Variables

Contains the post name, version, and compatible Mastercam version.

Do not use standard Windows Notepad. Use editors that feature syntax highlighting, line numbering, and column editing: Mastercam posts generally use the MP language

plin$ # Linear move if feed$ > 0, pbld, n$, "G01", pxout, pyout, pzout, "F", feed$, e$ else, pbld, n$, "G01", pxout, pyout, pzout, e$

These are the "subroutines" that Mastercam calls during posting:

Notepad++ or VS Code work well if Code Expert is unavailable.

Run the code through simulation software (Vericut or Mastercam Machine Simulation) before loading it onto the physical CNC machine. 🚨 Troubleshooting Common Errors Most generic posts (like MPFAN or MPMaster) include

Mastercam post processor editing is not a mystical art reserved for software developers; it is a systematic process of understanding machine logic and text manipulation. By mastering the eight sections of the .PST, learning the function of key post blocks ( psof$, ptlchg$ ), and utilizing the built-in Post Debugger, you can transform generic code into high-performance, automated G-code.

: Post processors are typically found in the Shared Mastercam\Posts directory on your computer.

Note: pbld enables the block skip character, n$ forces line numbering, and e$ signifies the end of the line. Modifying Coolant M-Codes