Mastercam postprocessor modify request
The postprocessor is an essential part of the Mastercam system because it determines how the toolpath created in the software is converted into machine-specific NC code. Every machine tool is different—even different models from the same manufacturer, with various options and accessories, might require a different code structure. For this reason, the postprocessor often needs to be customized to match the machine, its controls, and the customer’s practices.
The Customization Process
Modifying the postprocessor for simpler machine tools can usually be accomplished in just a few days, provided all necessary information and test data are available right away. For more complex multi-axis machines or specialized controls, the process may take longer, as testing and fine-tuning involve multiple steps and checks.
Adjusting the postprocessor is always a collaborative project between the customer and the postprocessor developer. Camcut acts as an intermediary in this process: we receive feedback and test programs from the customer, review potential changes, and, if necessary, forward them to the postprocessor developer.
Providing Feedback and Testing
Postprocessor testing should start with a straightforward test piece containing typical machining directions, tool changes, and work cycles. This makes it easier to pinpoint errors and ensures that the basic functions are working correctly before broader program testing.
If the postprocessor is tested directly with a production part, it’s important to recognize that the NC code may not fully meet the machine’s requirements in the initial stages. Implementing changes and testing new versions can take time, so a gradual, step-by-step approach is recommended.
Marking Up the Test Program
The easiest way to provide feedback on the postprocessor’s functionality is to create a test program in Mastercam and clearly indicate the necessary changes directly in the NC code. For example, asterisks (***) can be used to highlight the lines where the user wants changes or where incorrect operation was observed:
%
O0000(TEST PROGRAM)
N100 G21
N110 G0 G17 G40 G49 G80 G90
N120 T219 M6 ***Move the M6 command after the tool position***
N130 G0 G90 G54 X-25. Y10. A0. S3000 M3 ***A-axis does not need to be output***
N140 G43 H219 Z25.
N150 Z10.
N160 G1 Z0. F600.
N170 X-15.
After this, the modified NC code as well as the original Mastercam file should be sent to Camcut via email. We’ll check if the requested changes can be made directly in Mastercam’s settings or if a deeper postprocessor update by the developer is necessary.
Required Information and Responsibilities
Successfully modifying the postprocessor is only possible if the technical requirements and control commands for the machine tool are known. If the customer is unsure what G and M commands the machine requires, this information must be obtained from the machine's importer or the control manufacturer before customizing the postprocessor.
Camcut is happy to assist in this process and advise which information is needed to keep things moving as smoothly as possible.
Postprocessor modification is a crucial step in implementing the Mastercam system. Careful testing and clear feedback significantly speed up the process. At best, a properly configured postprocessor produces flawless NC code ready for production—safely, efficiently, and tailored to the user’s preferences.
