124 Section 1 Introduction to Drafting
selected objects, and calculate distances, areas,
and perimeters.
Display control commands are used to con-
trol how a drawing is displayed on screen. These
commands allow you to control the position
and magnification of the screen window, save fi
views for later use, and redraw or “clean up” the
screen.
Dimensioning commands enable the drafter
to automate the dimensioning process. They
are used to draw dimensions showing lengths,
distances, and angles between object features.
Drawing aids allow the drafter to speed
up the drawing process, and at the same time,
maintain accuracy. Typical drawing aids in a
CAD program include grid, snap, and ortho.
Other features of a good CAD package
include: layers, colors, linetypes, blocks, and
attributes. A layer is a virtual piece of paper
on which CAD objects are placed. Proper layer
management is important to effective CAD
drawing. Object display colors and linetypes
should also be managed properly. Object colors
help to visually catalog the objects in a drawing.
Linetypes enable the drafter to apply the Alpha-
bet of Lines. Blocks are special objects that can
best be thought of as symbols inserted into the
drawing. An attribute is text information saved
with a block.
Most quality CAD packages also include 3D
drawing and viewing commands. Some of the
most common 3D-based commands are used for
isometric drawing, 3D modeling and viewing,
3D animation, and rendering. These commands
allow you to design, model, analyze, and in
some cases “premachine” a part all within the
computer.
Additional Resources
CAD Software Resources
Autodesk, Inc.
Developer of AutoCAD, Inventor, Revit
Systems, 3ds max
www.autodesk.com
Auto-des-sys, Inc.
Developer of Form•Z
www.formz.com
Bentley Systems, Inc.
Developer of MicroStation
www.bentley.com
Cadalyst
www.cadalyst.com
Parametric Technology Corp.
Developer of Pro/ENGINEER, Pro/
MECHANICAL, Pro/DESKTOP
www.ptc.com
Siemens PLM Software
Developer of Solid Edge
www.plm.automation.siemens.com
SolidWorks Corporation
Developer of SolidWorks
www.solidworks.com
Review Questions
1. The instructions you provide to CAD soft-
ware to achieve the end result are called
_____.
2. _____ menus appear at the top of Windows-
based software.
3. What type of commands allow you to
begin, save, and open drawings?
4. A _____ is a drawing file with precon- fi
fi gured user settings. fi
5. In the Cartesian coordinate system, the
horizontal axis is the _____ axis and the
vertical axis is the _____ axis.
6. _____ commands (such as the
Line
com-
mand) allow you to create objects on the
computer screen.
7. Identify four common methods of defi fining
a circle.
8. A(n) _____ is a portion of a circle.
9. A(n) _____ is a closed circular object with
an oval shape.
10. A regular _____ is an object with sides of
equal length and included angles.
11. You can add text to a drawing using the
_____ command.
ch04.indd 124 11/13/2008 1:24:48 PM 11/13/2008 1:24:48 PM
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124 Section 1 Introduction to Drafting
selected objects, and calculate distances, areas,
and perimeters.
Display control commands are used to con-
trol how a drawing is displayed on screen. These
commands allow you to control the position
and magnification of the screen window, save fi
views for later use, and redraw or “clean up” the
screen.
Dimensioning commands enable the drafter
to automate the dimensioning process. They
are used to draw dimensions showing lengths,
distances, and angles between object features.
Drawing aids allow the drafter to speed
up the drawing process, and at the same time,
maintain accuracy. Typical drawing aids in a
CAD program include grid, snap, and ortho.
Other features of a good CAD package
include: layers, colors, linetypes, blocks, and
attributes. A layer is a virtual piece of paper
on which CAD objects are placed. Proper layer
management is important to effective CAD
drawing. Object display colors and linetypes
should also be managed properly. Object colors
help to visually catalog the objects in a drawing.
Linetypes enable the drafter to apply the Alpha-
bet of Lines. Blocks are special objects that can
best be thought of as symbols inserted into the
drawing. An attribute is text information saved
with a block.
Most quality CAD packages also include 3D
drawing and viewing commands. Some of the
most common 3D-based commands are used for
isometric drawing, 3D modeling and viewing,
3D animation, and rendering. These commands
allow you to design, model, analyze, and in
some cases “premachine” a part all within the
computer.
Additional Resources
CAD Software Resources
Autodesk, Inc.
Developer of AutoCAD, Inventor, Revit
Systems, 3ds max
www.autodesk.com
Auto-des-sys, Inc.
Developer of Form•Z
www.formz.com
Bentley Systems, Inc.
Developer of MicroStation
www.bentley.com
Cadalyst
www.cadalyst.com
Parametric Technology Corp.
Developer of Pro/ENGINEER, Pro/
MECHANICAL, Pro/DESKTOP
www.ptc.com
Siemens PLM Software
Developer of Solid Edge
www.plm.automation.siemens.com
SolidWorks Corporation
Developer of SolidWorks
www.solidworks.com
Review Questions
1. The instructions you provide to CAD soft-
ware to achieve the end result are called
_____.
2. _____ menus appear at the top of Windows-
based software.
3. What type of commands allow you to
begin, save, and open drawings?
4. A _____ is a drawing file with precon- fi
fi gured user settings. fi
5. In the Cartesian coordinate system, the
horizontal axis is the _____ axis and the
vertical axis is the _____ axis.
6. _____ commands (such as the
Line
com-
mand) allow you to create objects on the
computer screen.
7. Identify four common methods of defi fining
a circle.
8. A(n) _____ is a portion of a circle.
9. A(n) _____ is a closed circular object with
an oval shape.
10. A regular _____ is an object with sides of
equal length and included angles.
11. You can add text to a drawing using the
_____ command.
ch04.indd 124 11/13/2008 1:24:48 PM 11/13/2008 1:24:48 PM

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