Before downloading external files, check the standard installation folder of your Mastercam software. Every license includes a robust set of default, reliable posts: Machine Type Default Post Processor Name Target Controller / Engine MPFAN.PST Standard Fanuc-compatible controllers Lathe (2-Axis) MPFANL.PST Standard Fanuc-compatible turning centers Wire EDM MPFANW.PST Standard 2-axis and 4-axis Wire EDM setups Router MPROUTER.PST Basic 3-axis CNC router tables How to Install a New Mastercam Post Processor
When upgrading to a new version of Mastercam, you cannot simply copy over your old post processor files and expect them to work perfectly. The internal structure and syntax of Mastercam evolve, and an older post may become incompatible. Fortunately, Mastercam includes a built-in tool to handle this.
They will send you a specialized machine definition form to document your machine's exact dimensions, options, and controller firmware version.
A Mastercam post-processor is a text-based file (usually with the .pst or .psb extension) that acts as a language interpreter. It takes the internal NCI (Numerical Control Intermediate) file generated by Mastercam and converts it into G-code (M-code) that your specific machine tool can read. Mastercam Post Processors Download
Once you download a post processor file (usually ending in .pst for mill/lathe or .prm ), you must place it in the correct directories for Mastercam to recognize it.
(peck drilling, tapping, pocketing) match the controller's exact syntax.
A Mastercam post processor acts as a universal translator, converting your digital toolpath data (NCI files) into the specific G-code and M-code language required by your unique CNC machine controller. Finding, downloading, and configuring the right post processor is essential for achieving safety, precision, and peak efficiency on the shop floor. Understanding the Mastercam Post Processor Architecture Fortunately, Mastercam includes a built-in tool to handle
If you are looking for generic or experimental posts, some reputable third-party partners provide free libraries. In-House Solutions
Once you have downloaded your post files, you must place them in the correct directories for Mastercam to recognize them. Step 1: Locate your Shared Mastercam Folder
If the post is from an older version of Mastercam, use the Migration Wizard (File > Convert > Post Wizard) to update the logic to your current version. Tips for Safe Implementation It takes the internal NCI (Numerical Control Intermediate)
What (e.g., 2024, 2025, 2026) are you targeting?
If you run a home shop with a 3-axis Tormach, a free generic download might suffice. If you run a production shop with a $500,000 machine, a paid custom post is mandatory.
Always create a backup copy of your original, working post processor files before opening them in a text editor like Mastercam Code Expert or Notepad++. Change only one variable or code block at a time, post a sample toolpath, and use a text-compare tool to verify exactly how your changes altered the resulting G-code. Conclusion: Investing in Your Post Processing Workflow