Hi Michael,

It's a CNC software thing, well with NX anyway.
If a spline is used to create a surface and that spline is a bit crappy as in knot points etc. the guys here have a hard time machining that surface, so what we do is simplify the spline and it creates nice arcs and lines and then the software is happy.
In the case where it creates lots of little arcs, then we use that as a base to reconstruct the curve.

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