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Function
Using spline interpolation it is possible to obtain a very smooth curve from just a few defined interpolation points along a set contour. The interpolation points are connected by polynomials. The compressor converts linear movements, e.g., from CAD, at block transitions to splines of constant speed COMPON or splines of constant acceleration COMPCURV.
This yields soft transitions that reduce wear on the mechanical parts of the machine tool. However, if the interpolation points are placed close together, quite sharp edges can also be programmed. Spline interpolation also considerably reduces the number of program blocks required.
Extremely smooth workpiece surfaces are often very important in mold and tool making, both optically and technologically, e.g. for rubber seals. Tool radius compensation is possible in spline interpolation, as it is in linear or circular interpolation. Every polynomial can represent a spline.
Only the algorithm determines the type of spline.
- A spline is only true to the tangents.
- B spline is true to the tangents and the curvature, but does not run through the nodes (interpolation points).
- C spline is true to the tangents and the curvature and runs through the nodes.
Spline interpolation for 3-axis machining is suitable for simple applications and for the JobShop area.
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