drafting symbols - autocad and its applications basics 2010 · between statistical tolerance...
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AutoCADand Its Applications
B A S I C SStudent Web Si te
AutoCADand Its Applications
B A S I C SStudent Web Si te
REFERENCEMATERIALS
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 consis-
tent with the height of the text. In the following illustration, h = text height.
Diameter
Symmetrical
Conical Taper
ArcLength
AllAround
h = letter height
StatisticalTolerance
Slope SquareShape
Reference
Counterboreor Spotface
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
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AutoCADand Its Applications
B A S I C SStudent Web Si te
AutoCADand Its Applications
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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 table shows how to construct the symbols.
Anyneededheight
h
2 h
h
2 h
60°
2 h
Identification letter
Datum Feature Symbol
Datum Target Symbol
Target Point and Target Area
Material Condition Symbols
Geometric Characteristic Symbols
Optional shoulder
Filled or unfilled
Straightness
Flatness
Circularity
Cylindricity
Profile of a line
Profile of a surface
Position
Concentricity
Symmetry
Parallelism
Perpendicularity
Angularity
Circularrunoutor
or Totalrunout
Runout
Orientation
Location
Profile
Form
Target area size(when used)
Datum
Datum target symbolwithout area size
Datum target symbolwith area size
Target number
2 h
Target point Target areaDatum line
MMC, maximummaterial condition
RFS, regardless of feature size (no symbol,RFS is assumed unless otherwise specified)
LMC, leastmaterial condition
90°
1.5 h 0.8 h
GD&T Symbol Creation
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AutoCADand Its Applications
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AutoCADand Its Applications
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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
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 (continued)
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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
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 (continued)
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AutoCADand Its Applications
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h
1.5 h
h 2 h
60°
60°
Feature Control Frame with the 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 (continued)
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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 (continued)
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AutoCADand Its Applications
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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 (continued)
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AutoCADand Its Applications
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AutoCADand Its Applications
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To create GD&T symbols as text, create a style using the gdt.shx, GDT_IV�5, or GDT_IV50 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
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AutoCADand Its Applications
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Other SymbolsVarious industries have their own sets of standard symbols. The following
tables show typical symbols for the architectural, piping, and electrical industries.
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
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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
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AutoCADand Its Applications
B A S I C SStudent Web Si te
REFERENCEMATERIALS
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
to Base Terminal
Pentode UsingElongated Envelope
Antenna,General
Antenna,Dipole
Antenna,Dipole
Antenna,Counterpoise
Battery, LongLine Positive
MulticellBattery
Capacitor,General
Capacitor,Variable
Common Symbols for Electrical Diagrams
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