Part Modeling > Engineering Features > Rib > Trajectory Rib > Defining the Trajectory Rib
  
Defining the Trajectory Rib
When you create a trajectory rib, you can define the rib width and add an internal draft and rounds. There are several strategies for defining these attributes:
Commands for Defining Internal Attributes by Location
Attribute
Graphics Window
Trajectory Rib Tab
Shape tab
Rule
Width
Drag the width handle or enter a value in the box.
Enter a value in the box.
Type a value in the box.
The width value must be at least double the value of the round radius.
Draft
Right-click and select or deselect Add Draft.
Drag the draft handle or enter a value in the box.
Click .
Type a draft angle in the box.
The draft angle must be from 0 to 30.
Rounds
Right-click the rib preview and select or clear Add Internal Rounds, Add Exposed Rounds, or both.
Drag the round handle or enter a value in the box.
Click to add internal rounds, and to add exposed rounds.
Type round radii in the boxes.
Under Round top by, select Two-Tangent round or Specified Value.
Under Round bottom radius, select Same as top or Specified value.
The following relations are used to determine the maximum radius of the exposed round:
Rib with a draft—0.5 x width x tan (45+0.5 x draft angle)
Rib with no draft—0.5 x width