Navigate to the "Code Generation" section. Here you define:

Problem: The post generates a main file with M98 Pxxxx calls, but the subprograms are missing or have wrong names. Solution: In postMAX, verify the "Subprogram output" mode. Set it to "Local" or "Separate file" as required by your control.

In the world of high-speed and 5-axis CNC machining, OPEN MIND’s Hypermill is widely regarded as the gold standard for CAD/CAM. Its ability to generate complex, collision-free toolpaths—such as iso-machining and 5-axis swarf cutting—is unparalleled.

However, there is a critical bridge between the perfect simulation on your screen and the flawless execution on your machine tool: The Post Processor.

No matter how optimized the toolpath, without a precise, machine-specific Post Processor, the code is just data. This article explores the architecture, customization, and best practices for the Hypermill Post Processor.

Never send new post-processor code directly to a machine. Use Hypermill’s machine simulation to run a benchmark part. Watch for over-travel errors, unexpected rotation directions, and collision warnings.

HyperMill posts typically consist of a Start block, Tool Change blocks, Motion blocks, and an End block. The logic uses variables like @TOOL_NAME, @SPINDLE_SPEED, and coordinate outputs.


Many CAM systems rely on third-party post-processing engines (like ICAM or IMS) or generic templates that users must heavily customize.

HyperMILL takes a different route. OPEN MIND develops their post processors internally and treats them as integral parts of the software product. The HyperMILL Post Processor is not an afterthought; it is woven into the workflow.