offset curve in face is found as following:
menu - insert - derived curve - offset in face
Application:
offset curves along the faces on which they lie
Use the Offset Curve command to create curves at a distance from existing
lines, arcs, conics, splines and edges.
- Offset curves are constructed through points calculated normal or at a vector to the selected base curves.
- You can choose whether to associate the offset curves to their input data.
Curves can be offset:
- In the plane defined by the selected geometry.
- To a parallel plane using the draft angle and height options.
- Along a vector you specify when using the 3D Axial method.
- Multiple curves can only be offset if they are in a contiguous string.
The object types of the resulting curves are the same as their input curves,
except for conics and curves created using the Rough Offset option or the 3D
Axial method, which are offset as splines.
If the input string is linear, you must define a plane by defining a point
which is not collinear with the input string. This plane is used as the offset
plane.
You can create four different types of offset curves.
Distance type
Curves are offset in the plane of the source curves at a constant distance.
Draft type
Curves are offset at an angle to the plane of the source curves at the
constant distance.
Law Control type
Curves are offset in the plane of the source curves at a law controlled
distance.
3D Axial type
Curves are offset in a vector direction to the plane of the source curves at
a constant distance.
How offset curve works in Siemens Nx?