Mastercam’s built-in editor featuring syntax highlighting, auto-completion, and direct debugging tools for MP code.
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 ).
Use file comparison tools (like the one built into Mastercam Code Expert or WinMerge) to compare G-code generated before and after your edit.
pwcs$ #G54+ coordinate setting if workofs$ <> 0, sav_absinc = absinc$, absinc$ = 0 "G", *workofs$ + 54, e$ absinc$ = sav_absinc mastercam post processor editing
Alternatively, if you're looking for an to manage your posts, I can explain:
Post Processor Editing Class - CAD / CAM - Practical Machinist
Ensure the only changes in the text file are the ones you intended to make. Step 5: Dry Run at the Machine Take the new G-code file to the physical CNC machine. Remove all tooling and parts from the workspace. Set your rapid feed override to 25% or lower. Use file comparison tools (like the one built
These are the heart of the post. They contain logic that runs at specific times during the posting process (e.g., psof - post start of file, ptlchg - post tool change). Step-by-Step Guide to Editing a Post Processor Before starting, always make a backup of your .pst file. 1. Identify the Correct Post
pcool$ # Coolant output if cool_ant$ = 1, result = force$ ("M8"), e$ if cool_ant$ = 2, result = force$ ("M7"), e$
Identify the target cycle block, such as pmisc1$ or pmisc2$ . Remove all tooling and parts from the workspace
The pdrill$ post block is responsible for generating drilling code. You can modify it to meet the needs of your specific machine and application. One powerful method is to use the Miscellaneous Variables available in Mastercam. For instance, you could use mi6$ to control the output:
pdrill$ # Canned Drill Cycle if mi6$ = 1, "G81", pfzout, pfrout, e$ # Output G81 for standard drilling else, "G83", pfzout, pfrout, "Q", "0.1", e$ # Output G83 with Q value for peck drilling
Change 0.4 0.3 to 0.3 0.3 for three decimal places.