To Create a Variable Section Sweep Using Relations
You can use section relations with the trajpar parameter to make the section variable. The references to which the section is constrained changes the shape of the section. The sketch regenerates at points along the trajectory and updates its shape accordingly.
1. Click > 
Sweep. The Sweep tab opens.
Sweep. The Sweep tab opens.2. To select a trajectory, click the References tab, click the Trajectories collector, and then select chains of existing curves or edges. If needed, click Details to open the Chain dialog box to select the trajectory segments. Hold down CTRL to select multiple trajectories. Use SHIFT to select multiple entities in a chain.
 | The first chain you select becomes the origin trajectory. An arrow appears on the origin trajectory pointing from the trajectory start to the path the sweep will follow. Click the arrow to change the trajectory start to the other end of the trajectory. You can also select the trajectory or trajectories before clicking Sweep. Hold down the CTRL key to select multiple trajectories. Hold down the SHIFT key to select multiple entities in a chain. |
3. To create a section whose size and shape can vary along the sweep, on the Sweep tab, click 
Variable Section.
Variable Section.4. Click 
Solid to create a solid sweep, or 
Surface to create a surface sweep.
Solid to create a solid sweep, or Surface to create a surface sweep.5. To remove material along the sweep, click 
Remove Material, and then perform actions depending on whether the sweep is a solid or surface feature:
Remove Material, and then perform actions depending on whether the sweep is a solid or surface feature:◦ Solid
Solid▪ Optionally, click 
to flip the side of the sketch from which material is removed.
to flip the side of the sketch from which material is removed.◦ Surface
Surface1. Click the Quilt collector, and then select a quilt to trim.
2. To change the portion of the quilt to be removed, click 
to the right of Remove Material. Switch between three modes:
to the right of Remove Material. Switch between three modes:▪ Remove side 1
▪ Remove side 2
▪ Keep both sides
6. If you keep both sides of the quilt, to select the side that will inherit the original quilt ID, click to the right of the Quilt collector.
to the right of the Quilt collector.7. To give the sweep a thickness, click 
Thicken Sketch, and then type or select a thickness value. Use to switch the thicken direction between one side, the other side, or both sides of the sketch.
Thicken Sketch, and then type or select a thickness value. Use to switch the thicken direction between one side, the other side, or both sides of the sketch.8. For surface sweeps that remove material, click the Quilt collector, and then select a quilt to trim.
9. Click the References tab, and define sweep references.
10. If required, click the Options tab to set sweep options.
11. If required, click the Tangency tab to set trajectory tangency.
12. For solid features, click the Body Options tab, and then select the body to which to add geometry, or from which to remove geometry:
◦ Add geometry
▪ To add geometry to an existing body, click the body collector, and then select the body to which geometry is added.
▪ To create the feature in a new body, select the Create new body check box. The name of the new body appears in the body collector.
◦ Remove geometry
▪ To cut geometry from all the bodies that the feature passes through, select All.
▪ To cut geometry from selected bodies:
1. Select Selected.
2. Click the body collector, and then select bodies from which to cut geometry.
13. Create or retrieve a section to sweep along the trajectory by choosing one of the following actions:
◦ To create a section, click 
Sketch to open Sketcher. Sketch the section at the cross hairs at the beginning of the origin trajectory.
Sketch to open Sketcher. Sketch the section at the cross hairs at the beginning of the origin trajectory.◦ To retrieve a sketch to use as the section:
1. Click Sketch. Sketcher opens with cross hairs at the beginning of the trajectory.
Sketch. Sketcher opens with cross hairs at the beginning of the trajectory.2. Click > 
File System. The Open box opens.
File System. The Open box opens.3. Select a sketch to use as the section, then click Open. The Open box closes.
4. Click the cross hairs. The section you select appears at the beginning of the trajectory, and the Import Section tab opens.
5. Change any values in the dialog box to dimension the section relative to the cross hairs displayed on the trajectory, then click 
OK.
OK.| | In some cases, the sketch snaps to the model geometry automatically, which could change the resulting geometry. To prevent the sketch from snapping to the model geometry, perform one of these actions: • To disable snapping as the default, click >  Options > . Under Sketcher references, clear the Allow snapping to model geometry check box.• To disable snapping for the current action, while the Sketch tab is open, hold down the SHIFT key while you sketch. |
14. While the sketch is open, click > 
Relations. The Relations dialog box opens.
Relations. The Relations dialog box opens.15. In the graphics window, click the section dimension to vary. The dimension appears in the Relations dialog box.
| | Reference dimensions created inside the section of a variable section sweep should never be used in relations to drive any dimension. |
16. In the Relations dialog box, click =, and then type the section relation using the trajpar parameter as the independent variable to make the sketch variable.
17. In the Relations dialog box, click OK.
18. Click > OK.
OK.19. Click > 
OK.
OK.