Engineering 1182 College of Engineering Engineering Education Innovation Center Assembly Modeling Constraints Rev: AJPAssembly Modeling Constraints1

Engineering 1182 Assemblies Assemblies are collections of 3D parts that form one engineering system 1.Modeled to Fit Together 2.Location defined by 6 degrees of freedom 3 translational (x,y,z) 3 rotational (about x,y,z axes) 3.Assembly Constraints Concentric Mating Surfaces Coincident Distance Rev: AJPAssembly Modeling Constraints2

Engineering 1182 Modeled to Work Together Compatible Components Dimensional constraints Assembly Constraints Operational Requirements Rev: AJPAssembly Modeling Constraints3

Engineering degrees of freedom constrain an instance of a part file X,Y,Z Translation X,Y,Z Rotation Defining Location Rev: AJPAssembly Modeling Constraints4

Engineering 1182 Concentric Mating Surfaces Coincident Distance Assembly Constraints Rev: AJPAssembly Modeling Constraints5 The bridge example will be used to demonstrate these core concepts

Engineering 1182 Concentric Constraints Rev: AJPAssembly Modeling Constraints6 Axes of cylindrical features and holes can be selected Concentric constraints align centerline axes

Engineering 1182 Mating Surfaces Rev: AJPAssembly Modeling Constraints7 2D surfaces can be mated to become flush with one another but the correct direction must be given to the computer

Engineering 1182 Additional Constraints Rev: AJPAssembly Modeling Constraints8 Distance between entities if not flush Coincident Lines or Vertices

Engineering 1182 SolidWorks Adding Components Rev: AJPAssembly Modeling Constraints9 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 Select from the open parts listed or use the Browse to find saved files

Engineering 1182 After placing the base part, reopen the Insert Component dialog box and click on the pin to keep the box open. Now browse and double click on or Open the second part and left SINGLE click in SolidWorks window to place second part. Next go to the Insert Component dialog box and single left click on the second part just inserted so that it’s blue high-lighting is removed. Now click on browse and select the third part, left SINGLE click to place it, left click on the third part in the Insert Component dialog box to remove the blue high-lighting and repeat sequence. After placing the last part, select the green check mark or hit ESC to complete the insertion of parts. Note that if multiple copies of any part are needed, one can SINGLE click again after the part has been placed to produce another copy of the part. SolidWorks: First Component The first part inserted will become fixed in space and should be placed at the origin as a base for the assembly. This must be done by selecting the part and then clicking the green check mark to default to the origin instead of just left clicking in space. The first part inserted will become fixed in space and should be placed at the origin as a base for the assembly. This must be done by selecting the part and then clicking the green check mark to default to the origin instead of just left clicking in space. ANCHORING THE BASE AT THE ORIGIN INSERTING ADDITIONAL PARTS

Engineering 1182 SolidWorks Constraints Rev: AJPAssembly Modeling Constraints11 In SolidWorks these are the Standard Constraints used in Assemblies In the figure window it will show a preview of the mating and a smaller dialog box will appear Change Direction Confirm Mate

Engineering 1182 SolidWorks Example Assembly of a water filtering pitcher Rev: AJPAssembly Modeling Constraints12 1CUoq1zEhttp://youtu.be/1s- 1CUoq1zE

Engineering 1182 Water Pitcher Example Rev: AJPAssembly Modeling Constraints13 To start lets bring in the pitcher and top compartment and mate their two back surfaces

Engineering 1182 Water Pitcher: Top Compartment Rev: AJPAssembly Modeling Constraints14 Similar constraints are added to the sides and top ridge in order to fully constrain the top compartment

Engineering 1182 Water Pitcher: Filter Rev: AJPAssembly Modeling Constraints15 Now lets add to our assembly the water filter which fits into the circular hole of the top compartment

Engineering 1182 Water Pitcher: Inserted Filter Rev: AJPAssembly Modeling Constraints16 The bottom ridge of the filter and the top of the compartment are selected and the faces are constrained to be flush

Engineering 1182 Water Pitcher: Section View Rev: AJPAssembly Modeling Constraints17 A section view can be used in order to see that the mates are correct Choose the correct plane that cuts through an object

Engineering 1182 Water Pitcher: Sub-Assembly Rev: AJPAssembly Modeling Constraints18 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

Engineering 1182 Deleting Constraints Rev: AJPAssembly Modeling Constraints19 All Constraints applied are located in the Model Tree under Mates

Engineering 1182 Deleting Constraints Rev: AJPAssembly Modeling Constraints20 Constraints can be selected and removed using the delete key

Engineering 1182 Assemblies Wrap-Up Assemblies – collection of 3D parts that form a system 6 Degrees of Freedom XYZ Translation XYZ Rotation Assembly Constraints Concentric Mating Surfaces Coincident Distance Homework Assignment: Buck-Eye-Phone Assembly Rev: AJPAssembly Modeling Constraints21

Engineering 1182 In-Class Assignment Rev: AJPAssembly Modeling Constraints22 Using the pre-made blocks and wheels construct a pinewood derby racer using assembly constraints A starter assembly is provided that is the basis for the In Class exercise Application Folder > IN-Class Problem Pinewood Derby Racer > Starter Assembly > PINEWOOD RACER START ASSEMBLY