feature-based modeling and optional advanced modeling · feature-based modeling and optional...
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Feature-Based Modeling and
Optional Advanced Modeling
ENGR 1182
SolidWorks 05
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Today’s Objectives Feature-Based Modeling (comprised of 2 sections as shown below)
1. Breaking it down into features Creating Construction Centerlines
Construction Centerlines to Create Holes
Constraining Circular Patterned Holes
2. Edge Features(3D Fillets & Chamfers) and Model Tree
SW05 Activity
SW05 Application
Optional Advanced Modeling –Methods to Save Time ( Planes, Axes, Mirroring & Patterning, Holes, Shells, Sweep, & Loft) with HYPERLINK navigation
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Feature-Based Modeling
• Break down into Features
• Series of Steps
• 1st Step: Base Feature
• Adding / Subtracting Material
• Edge Features
• Model Tree
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Breaking it Down into Features
ENGR 1182
SolidWorks 05
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Breaking it Down into
Features • Objects can be
thought of in terms of features
• Shapes
• Holes
• Rounds
• Etc.
• Determines design strategy
Feature Modeling
Example
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Series of Steps
• Base Feature • First Extrusion or
Revolve
• Reduce Steps of
Construction
• Features • Additions or
subtractions from
original base feature
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How many different ways
could we make this?
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Example Construction 1
We can think of the block in
terms of 2 “L” shapes and
then cut out the hole
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Example Construction 2
We can think of the block in
terms of a “C” shape and then
add the plank with a hole
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Example Construction 3
Finally, we could draw the
overall shape from the top view
and remove unwanted material
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An Important Concept
Most sketches can be greatly simplified by establishing horizontal and vertical "Centerlines" and then applying constraints employing those construction centerlines. When the object exhibits symmetry, those construction centerlines are often drawn though the origin. Many sketches will be much easier to constrain if one uses horizontal and vertical construction centerlines. Typically used constraints include dimensioning, symmetry and equal.
So even if you don’t initially recognize a need for vertical and horizontal construction centerlines, it is a very good practice to include them in your sketches!
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Using Construction Center Lines
to Position Multiple Holes In the sketch mode insert a horizontal
construction line of infinite length and 2
angled infinite length construction lines
through the origin using the “As
sketched” option. DIMENSION the
angle to be 45O.
Sketch a circle on each of
the the angled construction
lines setting all the circles
EQUAL.
Locate and Size all of the EQUAL
circles which requires 5 dimensions.
Exit sketch and perform an
Extruded Cut using the
“Through All” direction on the
FULLY DEFINED sketch.
Note that any additional circles require
corresponding angled construction lines
and located and sized circles.
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A Short Cut Method to Produce
Multiple Holes Any NUMBER In the sketch mode insert a
horizontal construction line of
infinite length and an angled
line as shown. DIMENSION the
angle to be 45 degrees.
Sketch a single circle on the
angled construction line,
locate and size the circle
Offset the pattern
center by x=y= 0.1
Select Display/Delete
Relations/Add Relations, click on
the Offset pattern center and the
part center, select Coincident and
then OK .
As illustrated earlier, exit the
now FULLY DEFINED
SKETCH and perform an
Extruded Cut using the
“Through All” direction.
Select Linear Sketch
Pattern/Circular Sketch
Pattern
Select the drawn circle and
set the pattern number to 4
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Breaking it Down
Wrap Up Breaking it down
Base Feature • Start with an extrusion (or
revolve) that contains the basic shape of the object
• Minimize steps by choosing an appropriate shape for the base step (what shape can be used to build off of)
• Do not try to take into account every detail, add later with additional features
Series of Logical Steps
Application SW05:
Problem 6.4 (ss) from the text.
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In-Class Activity
The object to the right can be
created many different ways.
Can you determine at least 2
different methods (starting on
different planes) and create the
same object?
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Edge Features and Model Tree
ENGR 1182
SolidWorks 05
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Edge Features
3D Fillets create rounded edges 3D Chamfers create slanted edges
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2D Fillets vs. 3D Fillets
• 2D Fillets are
only to be
used in
Sketches
• 3D Fillets are
used on edges
of the part
(3D Fillets are
extremely powerful in
making realistic
designs)
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SolidWorks Example:
Piston Head
How would you break this down into features?
Where would you start? Where would you use
the edge tools? At what point in the process?
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SolidWorks: Base Feature
There are a couple ways to effectively
model this piston head but for these
slides we will start with a simple
extrusion of a circle to create a cylinder
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SolidWorks: Extruded Cut
The volume will be
removed using an
extruded cut offset from
the bottom surface
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SolidWorks: Revolved Cut
The piston rings will be cut
out using a revolved cut
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SolidWorks: Review Design
Is there any other way that we
could have reached this point
and how many steps would it
have involved?
Would it be easier?
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SolidWorks: Extruded Cut
The pin hole and groove will be
removed using an extruded cut
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SolidWorks: Chamfer
The top slanted edge will be
added using a chamfer
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SolidWorks: Fillet
And finally the bottom edge of the
head will be smoothed out using a
Fillet (under the features menu)
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SolidWorks: Finished Part
This finished product
can now be used in an
assembly with other
components shown here
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SolidWorks: Design Tree
The design tree on the left of the
screen catalogs all the steps of
creating this part and records the
steps from top to bottom
Sketches are absorbed into
features but can be accessed
by clicking the plus sign next
to each feature
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SolidWorks: Part Editing
The design tree can be “rolled
back” by clicking and dragging the
blue bar at the bottom up and the
features are no longer shown
New features can be added to
this model in the middle of the
design tree while other items
are still “rolled back”
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SolidWorks: Altered
Final Part
These changes will also
carry over to the assembly
that contains the part
When the design tree is restored then all
the features return as long as changes do
not interfere with previous features
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Feature Based Modeling
Wrap Up
Application SW05:
Problem 6.4 (nn)
R3
Recognize Features of Object
Start with Base Feature
Carefully consider the use of
construction centerlines in most
sketches
Add or Remove Material in a series of
steps
Features to add last:
• 3D Fillets: Rounded edges
• 3D Chamfers: Slanted edges
Editing Features with Model Tree
TOP
VIEW
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Create the following shape
according to the features and
dimensions.
• First break this object down
into features (you should be
able to create this in 2
sketches)
• Then use 3D Fillets for the
4 rounded edges
Problem 6.4 (u)
Activity (SW05)
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Important Takeaways Feature-based modeling is used
to break down the features of a
part to create the part in an
efficient way.
Edge features, like chamfers and
fillets, are used to create
different edge designs efficiently.
R3
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What’s Next?
Due Next Class SW05 Application
Before next class, you will read
about assembly modeling.
Assemblies are collections of 3D
parts that are constrained to form
one engineering system.
Take SolidWorks 6 Quiz on readings
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Optional – Advanced Modeling
• Methods to Save Time
• Methods to Create Shapes
• Convert Entities
• Reference Geometry – Planes & Axes
• Mirroring
• Patterning – Linear & Circular
• Hole Wizard
• Shells
• Sweeps
• Lofts
• Advance Modeling Wrap Up
In the SLIDE SHOW MODE this page supports HYPERLINK
navigation
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Optional Advanced Modeling Techniques
ENGR 1182
SolidWorks 05
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Convert Entities
Desired
Object
Starting
Object
WITHOUT
Convert
Entities
WITH
Convert
Entities
(1) Draw Perimeter Circle,
(2) Dimensioned Center Circle
and (3) Carefully Create Closed
Sections for Cut (must precisely
connect circle midpoints with
corners as shown above)
Starting
Object (1) Draw Perimeter Circle,
(2) Dimensioned Center
Circle
(4) Must Trim Perimeter
Circle
(3) Click on Convert Entities
to automatically generate
shown RED Lines – No
Trimming of Perimeter
Circle required!
(5) Select Areas
to Extrude Cut
and accept Cut
(4) Select Areas
to Extrude Cut
and accept Cut
(adds all lines to the sketch plane and makes
them available for future operations with is very
useful when more than one feature appears
within a sketch)
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Reference Geometry: Planes
SolidWorks starts off with
the 3 original planes:
front, right, top
To add a new plane we
can reference previous
planes and create offset
new planes or other
options
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Reference Geometry: Axes
Axes can also be
created without the
creation of a 2D
sketch
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Mirror
First the Mirror
Plane must be
chosen
Mirroring creates
an reverse copy of
features on the
opposite side of a
mirroring plane
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Mirror
Once the plane has been
chosen then the features to
mirror are selected
The new features are
joined to the original model
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Linear Patterns
Features can also be
duplicated in linear patterns
in either one or two
directions.
Once edges are selected for direction,
number of instances and distance are
specified in the dialog box
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Circular Patterns
Once features and
axes are chosen the
angle and number of
instances are
specified
Features can also be
duplicated in circular
patterns around an axis
Also see slide 12 - Using Construction Center Lines to Position Multiple Holes RETURN TO START
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Holes
• Mating Parts
• Hole
Specifications
• Built-in Hole Tools
• Location and Size
Selected
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Holes using the Hole Wizard 1) Under Feature select Hole Wizard 2) Specify the type of Hole 3) Specify Hole Position 4) Add threads
1 2 3 4
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Shells
• Removes Volume
• Thin Wall Created
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Sweep
Pathways can be
combined with a 2D
profile, such as a
circle, to create what
is known as a sweep
Mirror
complex
features to
save time
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Loft
Lofting is taking two
profiles on separated
planes and filling the
space between with
material that blends
the original profiles
The same shape but different sizes
can be used
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Loft
Different shapes can be blended into one solid such as the
hexagon is connected to the circles of different sizes
Circular patterns,
fillets, and
appearances can
also be added
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Advanced Concepts Wrap Up Time Saving Methods
Reference Geometry
• Planes/Axes/Points
Mirroring
Linear Patterns
• One or two directions
Circular Patterns
Advanced Shapes
Sweep
Loft
OPTIONAL:
SolidWorks tutorials
Lofts
Pattern Features
Revolves and Sweeps
Found under the Building Models tab
of the SolidWorks tutorials
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