2013 Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 1 Drafting Symbols Symbols provide a “common language” for drafters all over the world. However, symbols can be meaningful only if they are created according to the relevant standards or conventions. This document describes and illustrates common dimensioning, GD&T, architectural, piping, and electrical symbols. Standard Dimensioning Symbols The size of dimensioning symbols varies with text size, but it should be consistent with the height of the text. In the following illustration, h = text height. Diameter Symmetrical Taper Arc Length All Around h = letter height Statistical Tolerance Slope Square Shape Reference Counterbore Countersink Depth (or Deep) Dimension Origin Radius Spherical Radius Spherical Diameter Controlled Radius Places or By Standard Dimensioning Symbols 1.5 h 2 h 2 h 0.5 h 0.5 h 1.5 h 1.5 h 1.5 h 2.5 h 0.8 h 0.3 h 0.6 h 0.3 h h h h h h h h h h 90° 60° 30° 30° 15° h 2 AutoCAD and Its Applications ADVANCED Reference Material
Transcript
2013
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 1
Drafting SymbolsSymbols provide a “common language” for drafters all over the world.
However, symbols can be meaningful only if they are created according to the relevant standards or conventions. This document describes and illustrates common dimensioning, GD&T, architectural, piping, and electrical symbols.
Standard Dimensioning SymbolsThe size of dimensioning symbols varies with text size, but it should be
consistent with the height of the text. In the following illustration, h = text height.
Diameter
Symmetrical
Taper
ArcLength
AllAround
h = letter height
StatisticalTolerance
Slope SquareShape
Reference
Counterbore Countersink Depth(or Deep)
DimensionOrigin
Radius SphericalRadius
SphericalDiameter
ControlledRadius
Placesor By
Standard Dimensioning Symbols
1.5 h 2 h
2 h
0.5 h0.5 h
1.5 h
1.5 h
1.5 h
2.5 h
0.8 h
0.3 h
0.6 h
0.3 h
h
h
h
h h
h h
h
h
90°
60°
30°
30°
15°
h2
AutoCAD and Its Applications ADVANCEDReference Material
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 2
Geometric Dimensioning and Tolerancing SymbolsYou can either create your own library of GD&T symbols, or use one of
AutoCAD’s GD&T fonts to insert the symbols as text. The following tables show how to construct the symbols.
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 3
With a dimension
In the feature control frame
h = lettering height
Combined withconventional tolerance
FreeState
TangentPlane
ProjectedTolerance Zone
Between Statistical Tolerance
Statistical Tolerancing Methods
Feature Control Frame withStraightness Geometric Symbol
0.8 h 1.5 h
Independency UnequallyDisposedProfile
2X 0.4H
2.5 h 30°
1.5 h0.8 h0.6 h
3 h
0.8 h
2 h
2 h
h
GD&T Symbol Creation
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 4
h
1.5 h
h 2 h
60°
60°
Feature Control Frame with FlatnessGeometric Characteristic Symbol
Feature Control Frame with CircularityGeometric Characteristic Symbol
Feature Control Frame with CylindricityGeometric Characteristic Symbol
Feature Control Frame with Profileof a Line Geometric Characteristic
Symbol and a Datum Reference
1.5 h h 2 h
h = lettering height
hh1.5 h 2 h
h h
2 h
GD&T Symbol Creation
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 5
2 h
h h
Feature Control Frame with Profileof a Surface Geometric Characteristic
Symbol and a Datum Reference
Feature Control Frame with Parallelism Geometric Characteristic
Symbol and a Datum Reference
Feature Control Frame with Perpendicularity Geometric Characteristic
Symbol and a Datum Reference
Feature Control Frame with Angularity Geometric Characteristic
Symbol and a Datum Reference
h 2 h1.5 h
0.6 h
60°
2 h
2 hh1.5 h
h
30°
2 h
h = lettering height
1.5 h
GD&T Symbol Creation
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 6
Circular Runout
Total Runout
Positional Geometric CharacteristicSymbol and Tolerance in a Feature Control
Frame with Three Datum References
Feature Control Frame with SymmetryGeometric Characteristic
Symbol and a Datum Reference
0.8 h
Runout symbols may be drawn open or filled
h = lettering height
1.5 h h 2 h
45°
0.6 h
1.5 h h 2 h
1.1 h
45°
1.5 h
h h 2 h
h
2 h
1.2 h
0.5 h
GD&T Symbol Creation
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 7
To create GD&T symbols as text, create a style using the gdt.shx font. Then use the lowercase alphabet to type the symbols. The following table shows the symbol produced by each lowercase letter.
Lowercase Letter Symbol Produced
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 8
Exterior Door
Interior Door
Pocket Door
Bifold Door
Bipass Door
Window
LightingOutlet
RecessedLightingOutlet
Wall LightingOutlet
FluorescentLight Fixture
Single ReceptacleOutlet
Duplex ConvenienceOutlet
Triplex ReceptacleOutlet
Special Outlet
Floor SingleReceptacle Outlet
Floor DuplexReceptacle Outlet
Single Pole Switch
3-Way Switch
220VOutlet
WeatherproofOutlet
Thermostat
Doorbell
Fan HangerReceptacle
Clock HangerReceptacle
TV Outlet
Toilet
Wall HungToilet
Urinal
OvalVanitySink
RectangularVanity Sink
Single Kitchen
Double Kitchen
Water Heater
Shower
Shower w/ Seat
Tub
Washer/Dryer
Range
Refrigerator
Fan
Conduit
Common Architectural Symbols
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 9
Name Left Side Front Right Side Left Side Front Right Side
ButtweldedScrewed
Single Line Piping Symbols
90° Elbow
45° Elbow
Tee
45° Lateral
Cross
Cap
ConcentricReducer
EccentricReducer
Union
Coupling
Copyright by The Goodheart-Willcox Co., Inc. Drafting Symbols 10
Amplifier
Capacitor,Polarized Microphone
Receiver,Earphone
Resistor,General
Resistor,Adjustable
Resistor,Variable
Transformer,General
Transformer,Magnetic Core
ShieldedTransformer,
Magnetic Core
Auto-Transformer,Adjustable
CircuitBreaker
Twin TriodeUsing Elongated
Envelope
Voltage Regulator,also, Glow Lamp
Phototube
Inductor, Winding,Reactor, General
Magnetic CoreInductor
AdjustableInductor
Ballast Lamp
Fluorescent,2-Terminal Lamp
IncandescentLamp
Ground
ChassisGround
Connectors,Jack and Plug
EngagedConnectors
Triode with DirectlyHeated Cathode andEnvelope Connection
