Top down assembly

1. Top down assembly Presented by- Dilip kumar garg Jayant sarode 1

2. Assembly Assembly modeling is the process of creating designs that consist of two or more components assembled together at their respective work positions . The components are brought together and assembled by applying suitable parametric assembly constraints to them. 2

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4. Assembly Modeling Approaches Bottom Up Assembly Top Down Assembly Combination 4

5. Bottom Up Assembly Traditional approach Parts are created individually in the part mode Inserted into the assembly, located and oriented (using the constraints) as per requirement 5

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7. Pros and Cons Allows the designer to use part drawings that already exist (off the shelf). Provides the designer with more control over individual parts. Any changes in the original part is reflected on all the instances in the assembly Assembly files created in this method occupy less disc space as they contain only the information related to the assembling of the parts. Errors are manually identified and modifications to each component are made to make the adjustment. If any of the assembly components is moved from its original location, then the assembly will not open. 7

8. Top Down Assembly Assembly file is created first with an assembly layout sketch. The parts are made in the assembly file itself and then assembled using assembled using assembly constraints . The new parts are created relative to other components. We create a skeleton first at the top of the hierarchy and move down the hierarchy, creating subassemblies and components. 8

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10. Skeletons What is it Zero-mass geometry Exact location detail Minimized geometric detail 10

11. Definitely Not this 11

12. Example to D esign an Alternator 12 All Skeleton Models in Top-Level Assembly 70 MB Subassembly, with Skeleton Model containing all required information ~ 20 MB Complete Top-Level Assembly 540 MB Neighboring Subassemblies 320MB

13. Assembly of by top Down Approach 13

14. Pros and Cons The overall design information is in one centralized location Reduce errors within complicated assemblies Increased quality Better project management visibility Concurrent engineering Top-level change control The approach is ideal for large assemblies consisting of thousands of parts. Creating the top down assembly require more analysis and work before start 14

15. Applications of top down Assembly 15