A post-processor is a customized software link that bridges your CAD/CAM (Computer-Aided Design/Manufacturing) software with your CNC machine. It converts the toolpaths created in your CAM software into a script of instructions—often in the machine’s native code—that your CNC machine understands. This makes the post-processor an essential part of your machining workflow, ensuring your parts are cut accurately, safely, and with all the features you’ve invested in.
Despite its importance, many consider the post-processor as a secondary concern when choosing CAD/CAM software or CNC equipment. However, a well-designed post-processor can unlock the full potential of your systems, while a poorly developed one may limit capabilities and introduce inefficiencies.
Key Considerations When Evaluating a CNC Post-Processor
Age and Support
Check the post processor’s lifespan and install base size. A long-standing, well-maintained post with numerous updates is often more refined and reliable. Newly developed posts lack features or contain undiscovered issues. Without a dedicated post, you could face high development costs and suboptimal system utilization. Be cautious if a generic or basic post is provided, as it may not leverage advanced system capabilities.
Testing and Validation
Always perform a test cut. Create a comprehensive toolpath covering all features you plan to use, then run it on your machine. Measure the output for accuracy, or check it by a qualified operator or in a simulation. This process can reveal whether the post supports necessary features like subroutines or machine-specific commands. Identifying unsupported features early saves time and avoids manual corrections later.
Ease of Modification and Customization
Most CAD/CAM packages allow users to modify posts—usually via simple checkboxes or configuration files. A post with many options indicates robust development and flexibility, a sign of maturity. Even customized options tailored to specific applications point to a well-supported system.
Variations for Different Machines
Inquire if multiple post variants are available for different models within a machine family. A good indicator of a mature post system is the existence of several tailored posts rather than a single generic version. Confirm that dedicated posts are available for new models to avoid complicated modifications or potential compromises.
Cost and Licensing
Ask about licensing fees. Some vendors charge annual fees for post processors or updates, while others include them at no extra cost with the software or machine. Clarify these terms to avoid unexpected expenses, especially if customizations are needed.
Vendor Relationship and Support
Evaluate whether there is an ongoing relationship between your CAD/CAM provider and your machine manufacturer. Long-term collaboration often results in better support, regular updates, and compatibility with new features—ensuring your post remains current and efficient.
Case Example: DATRON’s ‘next‘ Control System
DATRON’s next Control system is a user-friendly CNC control with an intuitive touchscreen interface for novice and experienced operators. Developed in close collaboration with Autodesk®, it leverages Fusion 360® CAM software with a shared library of post processors optimized for both systems.
This integration offers unique features like activating a ‘smoothing‘ filter in the next Control software. Smoothing adjusts the amount and placement of points in a toolpath while increasing the read ahead, resulting in smoother finishes, reduced vibrations, and faster cycles. The post automatically recognizes the software’s ‘tolerance‘ setting, enabling smoothing without manual intervention and producing higher-quality parts more efficiently and with minimal workflow disruption.
Final Thoughts: The Key Role of CNC Post-Processors
When selecting CAD/CAM and CNC systems, pay close attention to the connection facilitated by the post-processor. A high-quality, well-supported post enhances system capabilities, streamlines workflow, and produces superior results while reducing costs. Investing in systems with robust post-processing options and ongoing support ensures you maximize your equipment’s potential and stay ahead in efficiency and quality.
Ready to get more from your CNC systems? Explore our solutions or contact our team to see how optimized post-processing can elevate your results.
