To Create a Trajectory Rib
1. Make sure you have a flat surface or a datum plane to use as a sketch plane.
2. Click Model, click the arrow next to Rib, and click 
Trajectory Rib. The Trajectory Rib tab opens.
Trajectory Rib. The Trajectory Rib tab opens. | You could also select a sketch first, or select a datum plane or planar surface first, and then click the arrow next to Rib, and click Trajectory Rib. |
3. To select the body to which the rib geometry is added, click the Body Options tab, click the body collector, and then select the body.
4. To define the trajectory sketch for the rib, perform either of these actions:
◦ Sketch a sketch. This new independent sketch is internal to the profile rib feature:
1. Click the Placement tab.
2. Click Define. The Sketch dialog box opens.
| | You can also select Sketch from the shortcut menu. |
3. Select a datum plane or planar surface for the sketching plane. The sketching plane will be the top surface of the rib.
4. Click Sketch in the Sketch dialog box. The Sketch tab opens.
5. Sketch one or more lines, splines, or arcs to define the rib feature trajectory. The sketch can contain any number of open, closed, and self-intersecting curves.
The rib will be created where the sketch is projected onto the selected body.
6. Click 
OK. The Sketch tab closes. The Trajectory Rib tab resumes.
OK. The Sketch tab closes. The Trajectory Rib tab resumes.◦ Select a sketch in the Model Tree. This section is dependent on the parent sketch. You can break the association by clicking Unlink. This makes a copy of the parent sketch as an internal sketch in the rib feature.
The sketch must meet the requirements mentioned above.
Preview geometry appears in the graphics window. A direction arrow indicates the side of the sketch on which the geometry is created.
5. To define the rib width, perform any of these actions:
◦ On the Trajectory Rib tab, type a value in the 
width box.
width box.◦ On the Shape tab, type a value in the width box.
◦ In the graphics window, drag the width handle, or type a value in the box.
The width value must be at least double the value of the round radius.
6. To define a draft that widens the bottom of the rib, click 
Add Draft on the Trajectory Rib tab, and then perform any of these actions:
Add Draft on the Trajectory Rib tab, and then perform any of these actions:◦ On the Shape tab, type an angle value in the draft box.
◦ In the graphics window, drag the draft handle, or type an angle value in the box.
The draft value can be from 0° through 30°.
7. To round the exposed edges at the top of the rib, click 
Round Exposed Edges on the Trajectory Rib tab. Then select an option under Round top by on the Shape tab:
Round Exposed Edges on the Trajectory Rib tab. Then select an option under Round top by on the Shape tab:◦ Two-Tangent round to create a full round. The maximum radius is driven by a relation that is dependent on the width and draft angle of the trajectory rib:
▪ Rib with a draft—0.5 x width x tan (45+0.5 x draft angle)
▪ Rib with no draft—0.5 x width
◦ Specified Value to create a round with a radius that you specify. Then type a value for the radius in the R box, or drag the round handle in the graphics window.
8. To round the internal edges at the bottom of the rib, click 
Round Internal Edges on the Trajectory Rib tab. Then select an option under Round bottom radius on the Shape tab:
Round Internal Edges on the Trajectory Rib tab. Then select an option under Round bottom radius on the Shape tab:◦ Same as top—Creates rounds on the internal edges of the rib with the same radius as the rounds on the exposed edges. Available when Specified Value is selected for the exposed edge round radius.
◦ Specified Value—Creates a round with a radius that you specify. Then type a value for the radius in the R box, or drag the round handle in the graphics window.
9. Click 
OK.
OK.