Mastercam Post Processor Editing Here

Standardizing G-code headers ensures operators can identify the program name, part number, date, and tools required directly from the CNC control screen.

Use file comparison tools (like the one built into Mastercam Code Expert or WinMerge) to compare G-code generated before and after your edit.

case work_ofs$ of 0: "G54" 1: "G55" default: "G54" #Fallback endcase mastercam post processor editing

Setting up specific routines to allow for automatic tool changers or changing the way the tool description is output in comments.

Post files are usually found in the C:\Users\Public\Documents\shared Mastercam 20xx\Posts directory. Core Components of a Post Contains the post

In Mastercam, a (often called a "post") acts as the essential translator between the generic toolpaths created in the software and the specific G-code language required by a CNC machine. Editing these files is a critical skill for machinists who want to eliminate manual hand-editing on the shop floor, reduce cycle times, and ensure machine safety. Core Components of a Post

Contains the post name, version, and compatible Mastercam version. reduce cycle times

If your edited post outputs unexpected G-code or generates syntax errors, Mastercam provides native tools to track down the root cause. Utilizing the Bug Tracker ( bug2$ )

Always duplicate your original .PST file. Append the date and version number to the backup file name (e.g., Generic_Haas_VF3_BACKUP_2026_05_26.pst ).

Generate this from Mastercam to see the raw toolpath data before post-processing. It serves as your primary troubleshooting reference. Step-by-Step Guide to Common Post Edits

Adding program numbers, operator instructions, or safety commands at the start and end of programs.