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Assembly Modeling Constraints

Assembly Modeling Constraints. ENGR 1182 SolidWorks 05. Today’s Objectives. Creating assemblies by constraining 3D parts together Movement and Location dictated by Constraints SW05 In-Class Activity SW05 Out-of-Class Homework Assignment. Assemblies.

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Assembly Modeling Constraints

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  1. Assembly Modeling Constraints ENGR 1182 SolidWorks 05

  2. Today’s Objectives • Creating assemblies by constraining 3D parts together • Movement and Location dictated by Constraints • SW05 In-Class Activity • SW05 Out-of-Class Homework Assignment

  3. Assemblies Assemblies are collections of 3D parts that form one engineering system • Modeled to Fit Together • Location defined by 6 degrees of freedom • 3 translational (x,y,z) • 3 rotational (about x,y,z axes) • Assembly Constraints • Concentric • Mating Surfaces • Coincident • Distance

  4. Modeled to Work Together • Compatible Components • Dimensional Tolerances • Assembly Constraints • Operational Requirements • Moving? Fixed?

  5. Defining Location • 6 degrees of freedom constrain an instance of a part file • X,Y,Z Translation • X,Y,Z Rotation

  6. Assembly Constraints • Concentric • Mating Surfaces • Coincident • Distance The bridge example will be used to demonstrate these core concepts

  7. Concentric Constraints Concentric constraints align centerline axes Axes of cylindrical features and holes can be selected

  8. Mating Surfaces 2D surfaces can be mated to become flush with one another but the correct direction must be given to the computer

  9. Additional Constraints Coincident Lines or Vertices Distance between entities if not flush

  10. SolidWorks Adding Components Select from the open parts listed or use the Browse to find saved files In the Assembly tab (similar to the Features tab of a Part file) use the Insert Components button to add part files to this assembly

  11. SolidWorks: First Component Select the pin to keep the Insert Component dialog box open after a component is added The first part inserted will become fixed in space and should be placed at the origin as a base for the assembly. This is done by selecting the part and then clicking the green check mark to default to the origin instead of just clicking in space.

  12. SolidWorks Constraints/Mates In the figure window it will show a preview of the mating and a smaller dialog box will appear In SolidWorks these are the Standard Constraints used in Assemblies Change Direction Confirm Mate

  13. SolidWorks Example • Assembly of a water filtering pitcher • http://youtu.be/1s-1CUoq1zE

  14. Water Pitcher Start The first part inserted will become fixed in space and will be placed at the origin aligning the 3 major planes (front, right, top) as a base for the assembly by selecting the part in the open parts list and clicking the green check mark Origin of Base Part Origin of Assembly Aligned Origins

  15. Water Pitcher Example:First Mate Next lets bring in the top compartment and mate the two back surfaces

  16. Water Pitcher:Top Compartment Similar constraints are added to the sides and top ridge in order to fully constrain the top compartment

  17. Water Pitcher: Filter Now lets add to our assembly the water filter which fits into the circular hole of the top compartment We’ll add a concentric constraint in order to align the axis

  18. Water Pitcher: Inserted Filter The bottom ridge of the filter and the top of the compartment are selected and the faces are constrained to be flush

  19. Water Pitcher: Section View A section view can be used in order to see that the mates are correct Choose the correct plane that cuts through an object

  20. Water Pitcher: Sub-Assembly The top cover of the water pitcher consists of 2 pieces that were put together in a separate assembly and then brought into the current assembly

  21. Deleting Constraints All Constraints applied are located in the Model Tree under Mates

  22. Deleting Constraints Constraints can be selected and removed using the delete key

  23. Assemblies Wrap-Up Homework Assignment SW06-OUT : Buck-Eye-Phone Assembly • Assemblies – collection of 3D parts that form a system • 6 Degrees of Freedom • XYZ Translation • XYZ Rotation • Assembly Constraints • Concentric • Mating Surfaces • Coincident • Distance

  24. In-Class Activity Create the base of any pinewood derby racer by inserting the chassis (first) and then inserting the axles Using the pre-made blocks and wheels construct some kind of pinewood derby racer using assembly constraints

  25. Important Takeaways • Assemblies are collections of 3D parts that form one engineering system • Assembly constraints are used to locate parts in the assembly relative to each other

  26. What’s Next? • Due Next Class: SW06 Out of Class HW • Before next class, you will read about advanced assemblies. • Take SolidWorks 7 Quiz on readings

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