Computer Aided Design (CAD) Part 2

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Computer Aided Design (CAD) Part 2

• Prof. Paul Kurowski

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In the first lesson We have learned a brief
history of CAD We have introduced SolidWorks CAD
system We have explained what does it mean that a
SolidWorks is solid and feature based. Now well
build a simple model.
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Open a new part
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Create a 2D sketch
Building the first feature begins with a 2D
sketch on one of the reference planes that come
with a new part. Learn how to make these planes
visible.
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Create a 2D sketch
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Select Front Plane (either from Feature Manager
window or Model view widow) and open Sketch on
this plane.
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Create a 2D sketch
Draw a circle 100mm in diameter with the centre
coincident with the origin of the sketch.
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Extrude 2D sketch into 3D feature
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Select Extrude tab, then Extrude Boss/Base,
specify the length of extrusion 160mm, click
Accept.
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Examine the 3D feature
We have created the first (and so far the only)
feature which is a solid cylinder 100mm in
diameter, 160mm long. Use the above menu to show
these dimensions. These dimensions are not set
in stone. They are Parameters and can be
changed.
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Modify the 3D feature
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Follow the steps above to change the length of
cylinder. The diameter can be changed the same
way.
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Add the second feature
Open sketch on this face
Open a 2D sketch on the end face of the cylinder
and draw a circle 60mm diameter. This circle can
now be used either to create another extrusion
(cylinder) or an extruded cut (hole). The
cylinder would be a positive feature, the hole
would be a negative feature. Will make a hole.
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Add the second feature
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Select Extrude tab, then Extruded Cut specify the
length of extrusion Through All.
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Define material properties
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Define material properties 1060 Alloy
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Examine model with two features
Both features we have created need sketches.
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Add one more feature
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From features menu select Fillet, specify 10mm
fillet size. From Model view select edge where
you want to add a fillet, click Accept button.
Fillet feature does not need a sketch.
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Review and save the part
ex01.SLDPRT
The part has now three features defined by four
parameters that show here are part dimensions.
All of the can be changed as long as part
topology remains the same. Try re-ordering the
features to see that model wont rebuild. Save
part as ex01.SLDPRT
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Summary
In this lesson we have Created 2D
sketches Created positive and negative features
Modified model geometry taking advantage of
parametric formulation of SolidWorks CAD
system Defined material properties In the next
lesson well examine more modeling techniques to
create parts of just about any complexity