Mastercam Post Processor Editing Jun 2026
Here are three real-world edits you might need tomorrow:
Managing Coolant CodesModern machines often have multiple coolant options: flood, mist, through-spindle, or high-pressure air. If your post only outputs M08, you can modify the coolant logic to recognize Mastercam's X-style coolant commands, ensuring the right M-code is paired with the right operation every time.
Integrated directly into Mastercam, featuring built-in syntax highlighting, auto-completion, and direct line-jumping for MP language structures.
A crashing post processor can cost hours of downtime. Adhere to these rules to stay sane.
Specifies the physical kinematics and axis configurations of your CNC machine. The Structure of a .PST File A standard .PST file is organized into distinct sections: Revision Log: Tracks changes made to the post over time. mastercam post processor editing
Have a specific post editing nightmare? Share your error code in the comments below. Chances are, someone has already fixed it with three lines of MP logic.
Locate the psof$ and ptlchg$ blocks. You will likely see a line like pbld, n$, sg28, sg91, e$ . Simply delete sg91, to keep the machine in absolute (G90) mode.
: The post governs the order of commands for tool changes and fluid activation to ensure they match machine capabilities. Essential Tools How to edit post processors - eMastercam.com
A Mastercam post processor (often with a .pst file extension) is a specialized script that takes the generic cutter location (CL) data created by Mastercam and translates it into the specific language (G-code and M-code) understood by your CNC machine. Here are three real-world edits you might need
pbld, n$, *t$, "M06", e$ # Existing tool change line pbld, n$, "M01", e$ # New line added to output M01 after the tool change
Technically, the "real" post processor is , a dynamic link library file inside Mastercam's core. However, the file users refer to and edit is the .PST file (Post Script Template). This ASCII text file contains all the rules, variables, and logic that MP.DLL follows to generate your NC code.
The post processor editing process typically involves:
Mastercam calculates tool geometry and generates an internal, machine-independent binary file called an NCI file . A crashing post processor can cost hours of downtime
Most shops require similar basic adjustments to match their operator preferences and safety protocols. 1. Modifying Text Output and Comments
Mastercam is a popular computer-aided manufacturing (CAM) software used by machinists and manufacturers to create and optimize G-code for CNC machines. One of the key components of Mastercam is the post processor, which plays a crucial role in converting the CAM software's output into a format that can be read by the CNC machine. In this article, we will explore the world of Mastercam post processor editing, including its importance, basic concepts, and step-by-step editing techniques.
: Modifying the post to automatically pull tool names or bin locations into the header of the G-code. Custom M-Codes