I have to assume the splines are from a digitised or scanned part. There can
be some very complex curves depending on the part shape and care must be
taken to ensure that what you create from this info is correct but try the
following, it works for me most of the time.
If all the splines are laid out fairly uniform then just explode them to
polylines. Make sure they are single entities with no severe corners and all
running in the same direction then create surface from mesh and machine.

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