Example of Merge Smooth Faces Option in Sweeps
Clear Merge
smooth faces to:
Improve
the performance of sweeps with guide curves. Sweeps generate faster and
merge between adjacent geometry and edges.
Segment
the swept body at all points where the guide curve or the path is not
curvature continuous (see the example below). Consequently, the lines
and arcs in the guide curves are more accurately matched.

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Merge smooth faces
selected |
Merge smooth faces
cleared |
The entities
that comprise the Path for sweeps
with guide curves need not be tangent.
NOTE:
When you clear Merge smooth faces,
the potential exists that some features created later might fail due to
the changed geometry.