164 Exploring Drafting
Hex Bolt Hex Cap Screw Hex Nut Slotted Oval Screw
Slotted Panhead Screw Phillips Flathead Screw Slotted Roundhead Screw Slotted Flathead Screw
Square Bolt Square Nut
Fasteners-Inch
Figure 7-12 A symbol library of fasteners used in mechanical drafting.
is a collection of related drawing symbols. See
Figure 7-12. To create a block, the symbol is
drawn and saved with a name. It can then be
inserted into drawings. Many manufacturers
and drafting fi rms provide blocks of their
products that can be downloaded from Web
sites on the Internet.
In some CAD programs, blocks may be
saved with attributes. Attributes are text
strings of information about the related
block symbol. For example, attributes may be
created to identify a product number, price,
size, or material. They can be displayed along
with the symbol on the drawing, or they may
be set invisible. Attributes are commonly
used to create schedules. A schedule is a
chart or table used to list manufacturing
and purchasing information about parts and
products on a drawing.
Drawing Setup Functions
CAD drawings should be planned care-
fully prior to beginning work. Making
drawing settings ahead of time increases effi- fi
ciency and is an important part of the CAD
drawing process. CAD programs provide a
number of common drawing setup functions.
Applying setup functions should become a
normal routine when beginning a drawing
project.
Linear and angular measurements made
with CAD commands are typically based
on the current unit settings. A drawing can
be set up to use decimal inch, architectural,
metric, or engineer’s units. Units are typically
set with the Units command. The unit format
selected depends on the drafting discipline.
Regardless of the unit format used, objects
are drawn at full size in CAD drafting. This
means that an object 2″ × 3″ is drawn at that ″
size. The drawing scale determines the size of
the drawing when it is plotted. The drawing
scale is based on the size of the drawing media
to be used and is determined before beginning
a drawing. The drawing scale affects the size of
dimensions and text. A number of settings are
typically made in relation to the scale factor,
such as linetype scaling and text height.
Layers are normally also created during
the drawing setup process. Linetypes are
defi and assigned to layers as needed. This fined
provides a means to organize a wide variety
of content.
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164 Exploring Drafting
Hex Bolt Hex Cap Screw Hex Nut Slotted Oval Screw
Slotted Panhead Screw Phillips Flathead Screw Slotted Roundhead Screw Slotted Flathead Screw
Square Bolt Square Nut
Fasteners-Inch
Figure 7-12 A symbol library of fasteners used in mechanical drafting.
is a collection of related drawing symbols. See
Figure 7-12. To create a block, the symbol is
drawn and saved with a name. It can then be
inserted into drawings. Many manufacturers
and drafting fi rms provide blocks of their
products that can be downloaded from Web
sites on the Internet.
In some CAD programs, blocks may be
saved with attributes. Attributes are text
strings of information about the related
block symbol. For example, attributes may be
created to identify a product number, price,
size, or material. They can be displayed along
with the symbol on the drawing, or they may
be set invisible. Attributes are commonly
used to create schedules. A schedule is a
chart or table used to list manufacturing
and purchasing information about parts and
products on a drawing.
Drawing Setup Functions
CAD drawings should be planned care-
fully prior to beginning work. Making
drawing settings ahead of time increases effi- fi
ciency and is an important part of the CAD
drawing process. CAD programs provide a
number of common drawing setup functions.
Applying setup functions should become a
normal routine when beginning a drawing
project.
Linear and angular measurements made
with CAD commands are typically based
on the current unit settings. A drawing can
be set up to use decimal inch, architectural,
metric, or engineer’s units. Units are typically
set with the Units command. The unit format
selected depends on the drafting discipline.
Regardless of the unit format used, objects
are drawn at full size in CAD drafting. This
means that an object 2″ × 3″ is drawn at that ″
size. The drawing scale determines the size of
the drawing when it is plotted. The drawing
scale is based on the size of the drawing media
to be used and is determined before beginning
a drawing. The drawing scale affects the size of
dimensions and text. A number of settings are
typically made in relation to the scale factor,
such as linetype scaling and text height.
Layers are normally also created during
the drawing setup process. Linetypes are
defi and assigned to layers as needed. This fined
provides a means to organize a wide variety
of content.

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