# Engineering Graphics H193

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```					                           First-Year Engineering Program

Engineering H191
Engineering Fundamentals and Laboratory I

Week 02 Day 03
Inventor® 2010
Chapter 3: Constructive Solid Geometry
Review and New Material
First-Year Engineering Program

• 2D Wireframe – Points and Lines

• 3D Wireframe – Points and
Edges

• Surface Modeling – Adding a
surface to 3D Wireframe

• Solid Modeling – Constructive
Solid Geometry
– Assembling primitive solids

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First-Year Engineering Program

• Feature-Based Parametric Solid Modeling
– A design process
•     Sketch a 2D shape
•     Extrude or revolve the shape to make a solid
•     Repeat as needed while adding or cutting away features
– Dimensions can be changed at any time in the
design process and the part will be updated
– This approach is typical for parametric modeling
programs – these include Pro Engineer, Solid
Works, Solid Edge, CATIA, and other software
packages.
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First-Year Engineering Program

Constructive Solid Geometry
• Objects are built from Primitive
Solids

– Join or Union

– Cut or Difference

– Intersection or Common
Material
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First-Year Engineering Program

With the rectangular solid and the cylinder, we produced the
figures on the previous page by doing a union, a difference,
and an intersection. The setup for the intersection is shown here.

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First-Year Engineering Program

Creating a More Complex Object

How would
you make
this object
as a set
of geometric
primitives?

Always plan

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Develop a Modeling Strategy
• First - do it individually
• Second – compare to the others at your table
• Which strategy had the fewest steps?

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This is Inventor’s opening slide

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First-Year Engineering Program

Select Metric

Autumn 2009         Select Standard (mm).ipt                  9
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Default Sketch Plane
• When you use the default sketch plane to begin with, you need
to begin with a profile from the proper view or the isometric will
be rotated from what you desire.

English system parts produce a FRONT view in the
isometric.
Metric system parts produce a TOP view in the
isometric.

If you forgot how to redefine the isometric view, refer back to
slide 24 of lecture 04

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First-Year Engineering Program

Select “Tools”, then “Document
Settings”, then “Sketch” to change
the grid spacing for the sketch

Document Settings

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Begin Construction: Draw Rectangle

Use “General Dimension” to get current size of rectangle
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Use Document Settings Again: Units

Use Document
Settings (Units) to
Set Display
Precision

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First-Year Engineering Program

Editing the Sketch

Single click on the dimension to bring up a dialog box
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First-Year Engineering Program

Setting Correct Dimensions on Sketch

Figure changes to match the dimensions and the dimensions
have the correct precision.
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The “Zoom All” Button on
the Standard Toolbar will

Or you can use the “Zoom” Button to
rescale your window as you wish
from the options in the pull down

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The “Zoom All” Button is also under the
the View tab

The same drop down menu can be found here
also
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Going from Sketch to Model

Right click
to bring up
select
‘Finish
Sketch”

Go to Part
Features –
‘Extrude’
With ‘Extrusion’ the “Base Sketch” becomes …

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Solid Model of the Base is Created

Extrusion 1
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Click on ‘+’ to see Sketch 1            19
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The Next Sketch Must Be on the Bottom Surface

Use “Dynamic
Rotate” to get
Bottom surface

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First-Year Engineering Program

Bottom Surface Revealed

Bottom
Surface

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First-Year Engineering Program

Sketch on Bottom Surface
Center of
Line

Corner and
Select Circle from Sketch Panel                             End of Line
Find green dot that indicates center of the line
Left Click once, drag circle to edge (another green dot)
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First-Year Engineering Program

• Finish Sketch 2 and use the Home Icon to see the top side
• Choose “Extrude”
• Pick the circle for your profile to extrude
• Set the Distance to 40 mm, click left and right arrows to see
a preview of the extrusion

Choose Right Arrow and Click OK.
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First-Year Engineering Program

This Completes Extrusion 2

Note: Extrusion 2 has Sketch 2
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Associated with It.          24
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Three More Extrusions (Cuts) Are Executed to
Complete the Drawing
Extrusion 4
Extrusion 3

Extrusion 5

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First-Year Engineering Program

Dimensioning Caution:
Enter dimensions explicitly, even if they appear correct. Constructive
Solid Geometry is not able to line up features if they are off by just
.0000000001

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First-Year Engineering Program

Today's Assignment

• Drawing 9 – INV Ch 3 in text example

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