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Top down assembly


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Top down assembly

  1. 1. Top down assembly Presented by- Dilip kumar garg Jayant sarode 1
  2. 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. 4. Assembly Modeling Approaches • Bottom Up Assembly • Top Down Assembly • Combination 4
  5. 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. 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. 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. 10. Skeletons What is it • Zero-mass geometry • Exact location detail • Minimized geometric detail 10
  11. 11. Definitely Not this 11
  12. 12. Example to Design 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. 13. Assembly of by top Down Approach 13
  14. 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. 15. Applications of top down Assembly 15