Top down assembly
Dilip kumar garg
• 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
Pros and Cons
• Allows the designer to use part drawings that already exist (off the
• Provides the designer with more control over individual parts.
• Any changes in the original part is reflected on all the instances in the
• 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.
Top Down Assembly
• Assembly file is created first with an assembly
• The parts are made in the assembly file itself and
then assembled using assembled using assembly
• The new parts are created relative to other
• We create a skeleton first at the top of the
hierarchy and move down the hierarchy, creating
subassemblies and components.
Example to Design an Alternator
All Skeleton Models
with Skeleton Model containing
all required information ~ 20 MB
Pros and Cons
• The overall design information is in one centralized
• 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