1. Extrusion Revolve
ENGR 1182
SolidWorks 02

2. Today’s Objectives Creating 3D Shapes from 2D sketches using:
Extrusion
Revolve
SW02 In-Class Activity
Extrude a Camera
Revolve a Wheel
SW02 Out-of-Class Homework Assignment

3. 3D Shapes Basic methods of creating 3D shapes using a 2D sketch:
Extruding
“Stretching” the shape from its original 2D outline to a 3rd Dimension
Revolving
Creating a 3D object by drawing a 2D cross-section and revolving that around an axis

4. Extrusion
ENGR 1182
SolidWorks 02

5. Extrusion Closed Profile on a 2D Plane Direction Amount
First Extrusion
New 2D Planes Created
Add or Subtract
Finished Product
A profile is defined in a 2D sketch on the appropriate plane and must be closed
The profile can be extruded in either direction or in both directions
The extrusion amount can be determined by the user and can be a specified distance, to a selected surface, or in the case of cuts: through all
The first extrusion of a 3D shape can now be used as the base feature of a final part
The faces are new 2D planes where sketches can be placed in order to do further extrusions or other operations
Add or subtract material from the original extrusion to create the final part

6. Adding Material Positive Extrusion
2D Profile used to add material at a specified length
2D Profile extruded to next surface or to selected surfaces

7. Subtracting Material Negative Extrusions
2D Profile used to subtract material at a specified length
2D Profile used to cut to selected surfaces or through all

8. SolidWorks: Extrude Dialogue Box
A Blind Extrusion is an Extrusion to a selected depth
Reverse Direction
Extrusion Options
Depth
Extruded Cut is for Negative Extrusions and contains many of the same options
Direction 2 (if needed)

9. How Could We Create This?

10. SolidWorks: Base Extrusion
A base feature can be created by extruding a 2D sketch located on one of the original planes
This profile is a nested profile and thus the final result only adds material between the outer and inner lines

11. SolidWorks: Sketching on Surfaces
Once the first extrusion is completed new faces are available for sketching.
Click the sketch button then select the 2D surface or plane that is necessary for the next step

12. SolidWorks: Extruded Cut
Once the base feature is created, a 2D sketch can be drawn on one of the faces of the new object
The depth can be determined by a numerical distance or other options for Extruded Cuts including:
Through All and to Next Surface

13. SolidWorks: Special Feature Extrusions
Extrusions can continue to be added and the resulting protrusion will be joined to the original base
If a profile overlaps the original geometry then the two extrusions will merge to create one part

14. SolidWorks: Editing Features
To edit any feature right click on the feature in the model tree
The dialogue window allows you to (from left to right, top to bottom):
Edit Feature
Edit Sketch
Suppress Feature
Roll Back
Hide
Zoom to Feature
Normal View to Feature
Change appearance (color)

15. Extrusion Wrap Up Extrusions Positive Extrusion Negative Extrusion
stretch a 2D profile to 3D
Negative Extrusion
remove material from a 3D model (cut)
Geometries merge
Loops have to be CLOSED
Homework Assignment SW02-OUT:
Create shape shown using positive and negative extrusions. Shape is important, dimensions are not. Print off Isometric with Name, Seat Number, and Instructor. Shape in text Problem 6.4 (f)

16. In-Class Activity
Design a camera with positive and negative extrusions. Be creative and feel free to create something original.

17. Revolve
ENGR 1182
SolidWorks 02

18. Revolving 2D Profile Extents Axis of Rotation: Full Rotation Degree
Attached
– Closed Solid
Separated
– Solid with Hole
A 2D profile is revolved around an axis of rotation to create a 3D shape
The profile can be revolved in either direction up to 360°
The axis of rotation can be:
Attached to the profile which will create a closed solid
Separated from the profile which will create an open solid
Revolving can create certain 3D shapes that would be extremely difficult to create with extrusion
Cones, wheels

19. Revolve Vs. Extrude Revolve Complements Extrusion
Some Objects Difficult to Extrude
i.e. Cones, wheels
How would you create this object with extrude?

20. Positive Revolves
Negative Revolves

21. Acceptable Profiles Just like Extrude a closed profile must be used
The revolution axis must not be crossed by the profile

22. SolidWorks: Revolution Axis
Options in the Line tool can be chosen to create a construction line that will be used as a revolution axis

23. How Could We Create This?

24. SolidWorks: Closed Profile
Example of a closed profile aligned with the center axis (created by using a construction line)
SolidWorks preview allows the designer to select the correct options

25. How Could We Create This?

26. SolidWorks: Hollow Profile
Example of a closed profile separated from the center axis (created by using a construction line)
This example shows how to create a hollow revolve. This is helpful in the creation of wheels, etc.

27. Revolves Wrap Up Positive Revolve Negative Revolve
Make a 3D object
Negative Revolve
Remove material from a 3D object
Attached Rotation
Will produce a closed object
Separated Rotation
Will produce an object with a hole
Use construction lines for axes
Ensure validity of profile (entire sketch is on one side of revolution axis)
Homework Assignment SW02-OUT:
Create the following shape. Focus on shape and proportionality, not dimensions.

28. In-Class Activity
Draw a wheel using a closed 2D profile similar to what is shown from Problem 6.4 (n)

29. Important Takeaways
3D shapes can be created from 2D sketches using the extrusion and revolve features.
Negative extrusions and revolves are used to subtract material for a specified length.
Sketching on surfaces after creating the first extrusion is done by clicking the sketch button and selecting the 2D surface desired.

30. What’s Next? Due Next Class: SW02 Out-of-Class HW
Before next class, you will read about geometric and dimensional constraint based modeling.
Geometric constraints constrain geometry based on normal orientations or relative to other parts of geometry.
Dimensional constraints are numerical values that constrain the size and location of geometry.
Take SolidWorks 3 Quiz on readings