I use 5 axis mill operation (veriable contour).Then I select workpiece as part geometry. When I generated. Tool path is confused. then change to MCS as part geometry. It is ok. Why?
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Can you provide a sample part file, since there are too many drive methods you can use to solve this from the top of ones head.
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Many of the drive methods in surface contouring do not require PART geometry. With PART, the drive path is project to the PART, but without PART, the drive path is used without projection.
My guess is that when you change the geometry parent to MCS, there is no PART geometry, so you are seeing a non-preojected path.