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Engineering 1182
Assembly Modeling Constraints
College of Engineering
Engineering Education Innovation Center
Rev: 20130715 AJP
Assembly Modeling Constraints
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Engineering 1182
Assemblies
Assemblies are collections of 3D
parts that form one engineering
system
1. Modeled to Fit Together
2. Location defined by 6 degrees
of freedom
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3 translational (x,y,z)
3 rotational (about x,y,z axes)
3. Assembly Constraints
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Concentric
Mating Surfaces
Coincident
Distance
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Engineering 1182
Modeled to
Work Together
• Compatible
Components
• Dimensional
constraints
• Assembly
Constraints
• Operational
Requirements
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Engineering 1182
Defining
Location
• 6 degrees of
freedom constrain
an instance of a
part file
• X,Y,Z Translation
• X,Y,Z Rotation
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Engineering 1182
Assembly
Constraints
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Concentric
Mating Surfaces
Coincident
Distance
The bridge example will be
used to demonstrate these
core concepts
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Engineering 1182
Concentric Constraints
Axes of cylindrical features and
holes can be selected
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Concentric constraints align
centerline axes
Assembly Modeling Constraints
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Engineering 1182
Mating Surfaces
2D surfaces can be mated to become
flush with one another but the correct
direction must be given to the computer
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Engineering 1182
Additional Constraints
Coincident Lines or
Vertices
Distance between
entities if not flush
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Engineering 1182
SolidWorks Adding Components
Select from the open
parts listed or use the
Browse to find saved
files
In the Assembly tab (similar to
the Features tab of a Part file)
use the Insert Components
button to add part files to this
assembly
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Engineering 1182
SolidWorks: First Component
ANCHORING THE
BASE AT THE
ORIGIN
The first part inserted will
become fixed in space and
should be placed at the
origin as a base for the
assembly.
This must be done by
selecting the part and then
clicking the green check
mark to default to the origin
instead of just left clicking in
space.
INSERTING
ADDITIONAL PARTS
After placing the base part, reopen the Insert
Component dialog box and click on the pin to keep
the box open. Now browse and double click on or
Open the second part and left SINGLE click in
SolidWorks window to place second part. Next go to
the Insert Component dialog box and single left click
on the second part just inserted so that it’s blue
high-lighting is removed. Now click on browse and
select the third part, left SINGLE click to place it, left
click on the third part in the Insert Component dialog
box to remove the blue high-lighting and repeat
sequence. After placing the last part, select the
green check mark or hit ESC to complete the
insertion of parts. Note that if multiple copies of any
part are needed, one can SINGLE click again after
the part has been placed to produce another copy of
the part.
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Engineering 1182
SolidWorks Constraints
In SolidWorks these are the
Standard Constraints used in
Assemblies
Change Direction
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Assembly Modeling Constraints
In the figure window it
will show a preview of
the mating and a smaller
dialog box will appear
Confirm Mate
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Engineering 1182
SolidWorks Example
Assembly of a water
filtering pitcher
• http://youtu.be/1s1CUoq1zE
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Water Pitcher Example
To start lets bring in
the pitcher and top
compartment and mate
their two back surfaces
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Water Pitcher: Top Compartment
Similar constraints are added to the
sides and top ridge in order to fully
constrain the top compartment
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Water Pitcher: Filter
Now lets add to our
assembly the water
filter which fits into
the circular hole of
the top compartment
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Engineering 1182
Water Pitcher: Inserted Filter
The bottom ridge of the
filter and the top of the
compartment are selected
and the faces are
constrained to be flush
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Water Pitcher: Section View
A section view can be used
in order to see that the
mates are correct
Choose the correct plane
that cuts through an object
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Water Pitcher: Sub-Assembly
The top cover of the water
pitcher consists of 2 pieces
that were put together in a
separate assembly and
then brought into the
current assembly
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Deleting Constraints
All Constraints applied
are located in the Model
Tree under Mates
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Deleting Constraints
Constraints can be
selected and removed
using the delete key
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Assemblies Wrap-Up
• Assemblies – collection
of 3D parts that form a
system
• 6 Degrees of Freedom
Homework Assignment:
Buck-Eye-Phone Assembly
• XYZ Translation
• XYZ Rotation
• Assembly Constraints
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Concentric
Mating Surfaces
Coincident
Distance
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Engineering 1182
In-Class Assignment
A starter assembly is
provided that is the basis for
the In Class exercise
Using the pre-made
blocks and wheels
construct a pinewood
derby racer using
assembly constraints
Application Folder > IN-Class Problem Pinewood Derby Racer >
Starter Assembly > PINEWOOD RACER START ASSEMBLY
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