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# Feature-Based Modeling

Feature-Based Modeling. ENGR 1182 SolidWorks 05. Today’s Objectives. Feature-Based Modeling Breaking it down into features 3D Fillets Model Tree SW05 In-Class Activity SW05 Out-of-Class Homework Assignment. Feature-Based Modeling. Break down into Features Series of Steps

## Feature-Based Modeling

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1. Feature-Based Modeling ENGR 1182 SolidWorks 05

2. Today’s Objectives • Feature-Based Modeling • Breaking it down into features • 3D Fillets • Model Tree • SW05 In-Class Activity • SW05 Out-of-Class Homework Assignment

3. Feature-Based Modeling • Break down into Features • Series of Steps • 1st Step: Base Feature • Adding / Subtracting Material • Edge Features • Model Tree

4. Breaking it Down into Features ENGR 1182 SolidWorks 05

5. Breaking it Down into Features • Objects can be thought of in terms of features • Shapes • Holes • Rounds • Etc. • Determines design strategy Feature Modeling Example

6. Series of Steps • Base Feature • First Extrusion or Revolve • Reduce Steps of Construction • Features • Additions or subtractions from original base feature

7. How many different ways could we make this?

8. Example Construction 1 We can think of the block in terms of 2 “L” shapes and then cut out the hole

9. Example Construction 2 We can think of the block in terms of a “C” shape and then add the plank with a hole

10. Example Construction 3 Finally, we could draw the overall shape from the top view and remove unwanted material

11. Breaking it DownWrap Up Breaking it down • Base Feature • Start with an extrusion (or revolve) that contains the basic shape of the object • Minimize steps by choosing an appropriate shape for the base step (what shape can be used to build off of) • Do not try to take into account every detail, add later with additional features • Series of Logical Steps Homework Assignment SW05-OUT: Problem 6.4 (ss) from the text.

12. In-Class Activity The object to the right can be created many different ways. Can you determine at least 2 different methods (starting on different planes) and create the same object?

13. Edge Features and Model Tree ENGR 1182 SolidWorks 05

14. Edge Features 3D Chamfers create slanted edges 3D Fillets create rounded edges

15. 2D Fillets vs. 3D Fillets • 2D Fillets are only to be used in Sketches • 3D Fillets are used on edges of the part • (3D Fillets are extremely powerful in making realistic designs)

16. SolidWorks Example: Piston Head How would you break this down into features? Where would you start? Where would you use the edge tools? At what point in the process?

17. SolidWorks: Base Feature There are a couple ways to effectively model this piston head but for these slides we will start with a simple extrusion of a circle to create a cylinder

18. SolidWorks: Extruded Cut The volume will be removed using an extruded cut offset from the bottom surface

19. SolidWorks: Revolved Cut The piston rings will be cut out using a revolved cut

20. SolidWorks: Review Design Is there any other way that we could have reached this point and how many steps would it have involved? Would it be easier?

21. SolidWorks: Extruded Cut The pin hole and groove will be removed using an extruded cut

22. SolidWorks: Chamfer The top slanted edge will be added using a chamfer

23. SolidWorks: Fillet And finally the bottom edge of the head will be smoothed out using a Fillet (under the features menu)

24. SolidWorks: Finished Part This finished product can now be used in an assembly with other components shown here

25. SolidWorks: Design Tree The design tree on the left of the screen catalogs all the steps of creating this part and records the steps from top to bottom Sketches are absorbed into features but can be accessed by clicking the plus sign next to each feature

26. SolidWorks: Part Editing The design tree can be “rolled back” by clicking and dragging the blue bar at the bottom up and the features are no longer shown New features can be added to this model in the middle of the design tree while other items are still “rolled back”

27. SolidWorks: Altered Final Part These changes will also carry over to the assembly that contains the part When the design tree is restored then all the features return as long as changes do not interfere with previous features

28. Recognize Features of Object Start with Base Feature Add or Remove Material in a series of steps Features to add last: 3D Fillets: Rounded edges 3D Chamfers: Slanted edges Editing Features with Model Tree Feature Based Modeling Wrap Up Homework Assignment SW05-OUT: Problem 6.4 (nn)

29. In-Class Activity Problem 6.4 (u) • Create the following shape according to the features and dimensions. • First break this object down into features (you should be able to create this in 2 sketches) • Then use 3D Fillets for the 4 rounded edges

30. Important Takeaways • Feature-based modeling is used to break down the features of a part to create the part in an efficient way. • Edge features, like chamfers and fillets, are used to create different edge designs efficiently.

31. What’s Next? • Due Next Class SW05 Out-of-Class HW • Before next class, you will read about assembly modeling. • Assemblies are collections of 3D parts that are constrained to form one engineering system. • Take SolidWorks 6 Quiz on readings

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