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Top down assembly

Date post: 09-Jul-2015
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Top down assembly Presented by- Dilip kumar garg Jayant sarode 1

Top down assembly

Top down assemblyPresented by-Dilip kumar gargJayant sarode1AssemblyAssembly 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.23 Assembly Modeling ApproachesBottom Up AssemblyTop Down AssemblyCombination 4Bottom Up AssemblyTraditional approach Parts are created individually in the part mode Inserted into the assembly, located and oriented (using the constraints) as per requirement56

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 assemblyAssembly 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.

7Top Down AssemblyAssembly 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.89

SkeletonsWhat is itZero-mass geometryExact location detailMinimized geometric detail

10Definitely Not this11

Example to Design an Alternator12All Skeleton Models in Top-Level Assembly70 MBSubassembly, with Skeleton Model containing all required information ~ 20 MB

Complete Top-Level Assembly540 MBNeighboring Subassemblies320MBAssembly of by top Down Approach13

Pros and ConsThe overall design information is in one centralized location Reduce errors within complicated assemblies Increased qualityBetter project management visibilityConcurrent engineeringTop-level change controlThe approach is ideal for large assemblies consisting of thousands of parts. Creating the top down assembly require more analysis and work before start

14Applications of top down Assembly15