- Operating Principle: Step-over Turning Method
- Geometry Definition and Automated Calculations
- Tool Definition and Preparation
- Cutting Strategy and Technological Parameters
- Multi-start Worms and the “Q” Parameter (Mazak Specifics)
- Handling Workpieces Without Undercuts (Entry/Exit Motion)
- Finishing Strategy and Corrections
- Coordinate Systems and Safety (EIA/ISO vs. Mazatrol)
- Project Management and NC Code Generation
Operating Principle: Step-over Turning Method
The core of the Worm module in EvoSpline is an advanced algorithm that controls the tool’s starting point. To understand the advantage of this method, it must be compared to traditional thread cutting.
Traditional Threading vs. Step-over Turning
In a standard threading cycle, the tool starts every pass from the same Z-axis position, changing only the depth in the X-axis. In this scenario, the resulting thread profile is a direct reflection of the cutting insert’s shape. To achieve a correct worm profile this way, you would need an expensive form tool.
EvoSpline redefines this process:
The software generates code that precisely offsets the tool’s starting point in both the X-axis and the Z-axis for each subsequent pass. This allows a standard insert (e.g., VBMT) to „sculpt” the desired, theoretical worm flank profile step-by-step, ensuring a perfect axial outline.
Key Quality Factors:
- Machine Precision and Condition: To achieve a smooth surface and an accurate profile, the machine’s mechanical condition must support high-precision positioning. Eliminating excessive backlash in lead screws and ensuring the geometry of the X and Z axes are well-maintained is critical for each tool path to align perfectly with the calculations.
- Spindle Repeatability (Mazak Technology): The step-over method relies on multiple threading passes with varying offsets. Mazak machines, equipped with advanced control systems and high-resolution encoders, provide perfect repeatability of the start point relative to the spindle’s angular position. It is this proven Mazak technology that allows for the flawless execution of the hundreds of precise passes required to form a perfect tooth.