Overview: Custom 5-Axis Non-RTCP Post-Processor Development
PNC developed a custom 5-axis non-RTCP post-processor in Autodesk Fusion for an older retrofitted CNC machine equipped with a non-standard industrial controller. The machine did not have native RTCP functionality, meaning the control system could not automatically compensate for the tool center point during simultaneous 5-axis movement.
Because of this limitation, the full kinematic compensation had to be calculated directly inside the post-processor. The moving-head machine configuration required custom logic for head-axis transformation, tool length compensation, rotary angle output, and machine geometry correction.
The project allowed the machine to perform stable simultaneous 5-axis machining without relying on native RTCP support from the controller.
Scope of work included:
- Custom Autodesk Fusion / HSM post-processor development
- 5-axis non-RTCP motion logic
- Moving-head kinematic transformation
- Tool center compensation inside the post-processor
- Machine geometry and pivot point compensation
- Rotary axis calculation and output
- Toolpath testing, adjustment, and validation
- Machine tuning and operational verification
Result:
The retrofitted CNC machine was successfully configured for stable simultaneous 5-axis machining without native RTCP capability. The custom post-processor remains operational and allows the machine to continue producing complex 5-axis work despite the limitations of the older controller.
Keywords: Autodesk Fusion post-processor, Fusion CAM 5-axis programming, HSM 5-axis post, custom CNC post-processor, 5-axis non-RTCP machining, non-RTCP post-processor, CNC kinematic compensation, moving-head CNC machine, old CNC controller retrofit, CNC retrofit programming, simultaneous 5-axis machining, 5-axis CNC calibration, tool center point compensation, CNC post-processor development.
