Mastercam - Post Processor Editing

Before diving into complex modifications, you must understand the basic structure of a Mastercam post-processor file. A. Understanding the Structure Post files are broken down into logical sections:

: Enable the debugger in Mastercam to step through the post-processing routine. This helps you identify exactly which part of the post processor code is generating specific lines of G-code. Common Customization Steps

Mastercam post processor editing gives you complete control over your CNC machinery, eliminating post-processing manual edits and optimizing cycle times. Start small by modifying text headers and disabling unwanted sequence numbers. As you grow comfortable with the MP language syntax, you can advance to structural tool change updates and complex macro call outputs.

Test, iterate, and document every change with comments (using # ). mastercam post processor editing

Adjust the way coordinates, feed rates, and speeds are displayed.

Think of Mastercam as the brain and the CNC machine as the hands. The post processor is the translator ensuring the hands know exactly what the brain wants to do. Converts CAD/CAM data into machine-specific code.

: Defines the physical axes and kinematics of the machine. This helps you identify exactly which part of

The primary script file containing the logic and formatting rules for G-code output.

Most machine shops require a predictable set of modifications to make generic posts align with their standard operating procedures. 1. Modifying Program Headers and Footers

Sets controller-specific logic, like how to format arcs (I, J, K vs. R) and drilling cycles. As you grow comfortable with the MP language

Sometimes you receive a machine definition that is password protected. While this protects the .CONTROL file, Mastercam allows you to click the "Lock" icon and enter a password to unlock it for editing. If you don't have the password, you cannot change critical machine parameters, but you can still edit the .PST file in a text editor, as the password lock does not encrypt the text file itself. However, editing the text file when the control definition is locked can lead to "Parameter Mismatch" errors.

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

This modification improves safety and readability by separating the toolchange and spindle start functions.