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Advanced
Assembly
Design
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Topics Covered:
Layout Design
Automatic Assembly
Skeleton Assembly
Simplified Reps.
Creating Part in an Assembly
Assembly Management
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Layout - 2D non-parametric sketch of design
- Engineering Notebook
Layout Data:
Sketched geometry
Design Notes
Global datum features for automatic assy
Global Dimensions and parameters
Global Relations
Layout Design
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Steps involved in Layout Design
Initialize the notebook (layout)
Sketch the design layout
Label components with balloons
Create global dimensions, parameters and relations
Declare notebook to other notebooks for parametric valuesCreate global datum features for auto assy.
Layout Design
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Advantages
Contains most of the engineering data of the design
Allows designers to access and control for several
models from one central location
It can drive any number of models and drawings
Ensures proper fits and sizes
Layout Design
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Two Steps must be taken to get automatic assembly.
. Create a layout with Global datum planes.
. Create the parts with the datum in the correct position and
declare these datum to be equal to datum in layout
Automatic Assembly
Advantage
. Easy to manage assembly constraints.
. Reduces poorly constrained assembly.
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Skeleton AssemblySkeleton Part:
define the overall shape(envelope) of the assembly.
skeleton part is created in assembly mode.
made of all datum and surface features.
components are directly assembled to the skeleton.
the mass of the assembly will not be affected
multiple_skeletons_allowed YES/NO
Number of skeleton per assembly
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Advantages:
reduces the number of parent-child dependencies for the
assembly.
components can be moved by modifying the skeletonany or all the parts can be removed without affecting the
other components.
able to have two and three dimensional motion occur in the
assembly.
Skeleton Assembly
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allow you to simplify a view of a design
one of the large assembly management technique
all simplified reps are based upon a Master Reps
reduces regeneration, retrieval, display time of assembly
it supports both TOP-DOWN and BOTTOM-UP designapproaches
Simplified Representations
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Types of Reps:
Master Reps
Graphics Reps
Geometry Reps
Simplified Representations
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Master Reps
always reflects fully detailed assembly, includingall of its assembly members
you can do all the assembly operations in this rep.
by default the assembly will be in master rep.
Simplified Representations
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Graphics Reps
contains information for display only.you cant modify or reference this rep for assembly
operations.
assembly operations are not possible.
display is depends on save_model_display value
Simplified Representations
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Simplified Representations
Geometry Reps
provides complete geometry of the assembly
useful for measurements and mass property
calculations
you cant reference this rep for assemblyoperations.
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Simplified Representations
Advantages:
Control in members of an assembly are retrievedinto session and displayed
Speeds up the regeneration and display process.
Reduces time taken for retrieval of the assembly
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Designing a part in assembly
We can create parts, sub-assemblies and bulk item in a assembly
mode.
Types of parts to be created in assembly:a. Solid Model (Regular part model)
b. Sheet metal (Regular sheet metal part)
c. Intersect (intersection of two or more parts)d. Mirror (mirror of existing part)
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Designing a part in assembly
Limitations in creating Intersect part:
you cannot move the resulting partyou cannot use harness parts to create a part by
intersection
you cannot retrieve the part until the assembly to
which it belongs is in memory
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Assembly Management
Modify Sub-assembly and
Restructure
Assembly Dimensions
Move, Copy and Pattern
Assembly Features
Assembly Info
Simplified reps
Assembling Concept
Blocks
Using Layers
Feature and Component
suppression
Display Control
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