Section 7:
Feature representations - recognition
PURPOSE
This section aims to enable the student to extend their knowledge of Drawing
Interpretation from Engineering Drawings produced to AS1100 standard.
Objectives
At the end of this section you should be able to:
o
IdentifY symbols used in Engineering Drawing.
General
Electrical
Welding
Fluid power
Mechanical
•
•
•
•
•
Completion guidance
This section provide an outline of the symbols used in drawings in the objectives stated above.
It is expected all students will be able to identifY 'general drawing symbols' and those from one
of the bulleted list in the objectives. The remaining types of symbols should be covered briefly,
so that a student can recognise a drawing or sketch with symbols as being from one of the
three remaining areas.
:MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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94
MEC076 -7-1
To be effective and competent in the reading of and interpretation of engineering drawings, it is
critical that we have a sound awareness of the names given to common features and their
function. A lot of these features are designated using abbreviations and symbols in order to
save time when producing a drawing, that is CSK - countersink or countersunk, c'bore counterbore, PCD - pitch circle diameter.
R
Diameter
050
Radius
R30
Slope and its
direction
(
)
Centre line
FL
Flat (material)
50 x 20 FL
PL
Plate (material)
10 PL
o
To indicate square
075
c:::=-
A taper and its direction
b
1.
Indicate corresponding dimensions on Section A-A
+0.1
Hole D12
0
012
.0.5
0
010 LJ012 :];10
06V012x90°
M10
012 LJ025
I::::::::,.. 1:1 0
A reference
dimension
1'
Dimension not
drawn t scale
1'
(620),1
60
V
Countersink (csk)
V03
LJ
Counter bore
(cbore)
LJ010
Depth of a
feature
~5
·1
Section A-A
2.
Fill in the missing details on the table below.
3:100
countersink
Counterbore
Spotface
o
Drill 010
Drill 010
U015 J 10
V900020
Depth offeature
40 x 10 FL
5 mm thick plate
Exercise 7-1
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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95
MEC076 - 7 -2
I
Block diagrams
These are simple diagrams intended to aid the understanding of the principle of operation of a
circuit or system. A block diagram on its own is of little use as it displays limited information.
Electrical symbols
Power
input
Electrical symbols are a graphical representation of a component or item to be used in a
diagram. Symbols are seen as a convenient means of representing items in a diagram as they
allow:
•
A symbol to replace the actual drawing of the item.
•
Items with similar appearances, but difft<rent functions, to be easily shown.
Power
supply
AC supply ____- I
Standard symbols in Australia comply with ISO (International Standards Organisation). They
are shown in Australian Standard 1102 (AS1102) Parts 1 to 15. Some symbols from Parts 1 to
15 are included in this workbook to assist you to identify them on a drawing. SAA HB3 - 1986
is also a useful reference.
Electrical
Regulator
Line
load
Starting
resistors
contactor
'----I Accelerating 1---1
contactor
Electrical diagrams
There are four basic types of electrical diagrams included in this workbook and used in
industry. They are:
•
•
•
•
Block diagrams
Circuit diagrams
Wiring diagrams
Architectural diagrams
' - - - - - - - 1 riming and
control
Circuit diagrams
These are detailed diagrams which should describe the operation of a circuit. Circuit diagrams
are sometimes called 'schematic diagrams'. Circuit diagrams do not necessarily represent
the actual physical layout of the equipment and wiring. Typical circuit diagrams are shown.
Competence in using electrical diagrams is essential for all electrical/electronic students. For
detailed knowledge students should complete NE31 Electrical Drawing, Interpretation and
Connection.
0
AO
The work included here is intended to provide a brief overview and some understanding of the
0
L1
T
L2
application of electrical symbols. Within this module you are expected to be able to explain
why standard symbols are used to represent components on electrical diagrams and identify
some common electrical symbols.
LP1
LP2
L3
A3
N
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
,,196iI:O
MEC076 -7 - 3
Wiring diagrams
Architectural diagrams (layout diagrams)
These are detailed diagrams showing the way in which a circuit or system is actually wired and
assembled. Components are often drawn in a simplified way in which the outline and external
These show various features related to the construction of a building. A typical diagram is
shown. They are also called 'layout or site diagrams'.
connections (terminals) are shown. All 'terminal to terminal' connections showing the
necessary conductors (wiring) required to connect the circuit are shown.
r----- ---------------------- - - --,
A
I
I
I
N
I
I
E
®
I
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S1
L___
i
@
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Bed 1
I
I
I
I
I _____ _
L
I
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:
:
___ ,
" ,
I
___~----L---*----J
--,-
I
Wiring diagram - basic lighting circuit
Dining
I
I
I
Bed 2
I
I
I
[J51
Bed 3
I
I
I
: :
:
I
I
,
I
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I
I
I
~---:-_®_--l---+---_®
:I
___ J
I
I
Living
I
TV
I
_...J
UJ
I
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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97
I
MEC076 - 7 -4
I
Electrical/Electronic symbols
This short table has been assembled from SAA HB3 - 1986 - Electrical & Electronic Drawing
Practice for students. For detailed information students should refer to that book or parts 1
to 15 of AS 1102.
Terminal strip
Junction of
steady voltage
Mechanical coupling
General6ymbol
Negative polarity
_ -' L_
or hydraulic connection
General 6ymbol
--V--
Mechanical interlock
E---
Operated by pushing
5---
Operated by turning
I;
Fault. The same symbol
Boundary line
Discharge lamp, gas
filled
General 6ymbol
----
-<
----.........
is used on equipment to
indicate a dangerous
voltage
e)- Signal lamp
Electric bell
+
alternating current
-0-
Manually operated
General symbol
Emergency switch
Battery of
accumulators or
primary cells
Earth (ground)
11111111~
voltage should then be
indicated
~ 1-----11-
Frame or chassis
connection
Part 3 - Resistors, capacitors and inductors
/-----I I I I
Heater
(1---.
Filament lamp
Indicator
-6-
Wiring or cabling in
8
Letter symbols for
coding cables
--1~
Example of nominal
voltage in a battery
~ h----il50V
Example:
E = Electrical
power
L = Lighting
SL=Street
lighting
COM=comm-
Jm
IC
MB
MCC
MK
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
Two-conductor cable
-
Method of cable
installation
Example: Electric power
cable on wall
Fixed resistor
General symbol
I-
-l
e
Overhead line
•
- E OW
Wiring or cabling joint
D
SWitchboard,
distribution board,
frame, panel or cubicle
1
Main switchboard
Emergency lighting
luminaire
I
MSB
=
0
-l 7 / I -
Underground line
Example letter symbols for coding of boards are as follows:
CP
Control panel
CN
= Control station
DBL
= Distribution board light
DSB
= Distribution board
Conductor or group
emphasised by
increasing its
thickness
/'
Variable resistor
General symbol
unication
of conductors. A
Cable
General symbol
I-
0
conduit, pipe or duct
Part 2 - Conductors and connecting devices
line for a particular
path may be
Plug (male) or one pole
of a plug
+lorl
(male and female)
- - --
Example: tee joint
The primary symbol may
be used to indicate a
battery. The nominal
Y or '(
Socket (female) or one
pole of a socket
-'-r-
Part 8 - Symbols for location diagrams
Primary cell or
accumulator. The long
line represents the
positive pole, the short
line the negative pole
Electric buzzer
-1,-
Junction of conductors
using terminals
Plug and socket
Mechanical, pneumatic
+
P06itive polarity
either direct or
Double junction (either
used)
Conductors,
crossing without
electrical connection
Suitable for use on
Alternating current
General6ymbol
32
-0--
method shown may be
conductors
Direct current or
Terminals or tags may
be numbered as shown
0
:::: Instrument cubicle
= Meter board
:::: Motor control centre
I
I
MSB
PBS
RCP
RP
SAS
TB
TP
= Main switchboard
= Push-button station
Remote control panel
= Relay panel
= Security and alarm systems
= Terminal box
= Terminal panel
=
= Marshalling kiosk
Luminaire or 5ignal
lamp
fi " iI 'II
98
I
®
Luminaire fixed to a wall
~
Emergency lighting
luminaire
~
MEC076 - 7 -5
I
Fluorescent lumina ire
Floodlight
c:::J
Electrical appliance General symbol
Example letter symbols for coding of electrical appliances are as
follows:
AC
Air conditioner
BWU = Boiling water unit
FH
Fan heater
GDU
Garbage disposal unit
=
=
=
1--1
Contactor - N/C
contact
Example: Luminaire
with three lamps
Example: Air conditioner
On-load isolator
H
HD
R
SDU
= Heater
= Hand dryer
= Range
= Sanitary disposal unit
fuse switch
Alternative
3x4OW
1-+-1
Two-way switch
Socket outlet
General symbol
Antenna (aerial).
General symbol
Television receivingJ
set
Lig hting outlet position
e.g. batten holder
Dimmer switch
~
Socket outlet for
telecommunications
X
t
~
r
Loudspeaker
oj
[0]
Microphone
0-
Electric buzzer
y
Horn
Generating station,
planned
D
Equipped wall telephone
outlet
:::n=='>
One way switches,
single-pole and twopole
lei
Push-button switch
©
r
~
,
Circuit breaker
Limit switch, make
contact
Manually-operated
switch
General symbol
~
~
I
I--~
Isolator
Fuse
Push-button SWitch,
(non-latching)
~
~
I
E--~
Example: Television
Radio receiving set
Electric bell
Clock
~
Part 11: Switching and protective devices
Make contact
Make contact early
to operate
Make contact
without spring
return (stay put)
~
~
~
MEC076 Engineering Drawing Interpretation 1
Resource Package
December. 1998
Break contact
Make contact late to
operate
Switch
General symbol
r
~
~
Changeover contact
Make contact with
spring return
Contactor - N/O
contact
~
~
~
, "it:O
99
MEC076 -7 - 6
Exercise 7-2
5.
IdentiiY and complete the table showing the symbols used on the diagram.
IdentiiY and complete the questions and statements
1.
--tl
power _ _
input
•
2.
,----- ---------------------- -
What type of diagram is this?
~
I
,---'===1
Power
supply
- --,
II
0
I
I
i
I
I
What type of diagram is this?
__ ~.,
1
1L __ _ .
CP
:I
:I
t
I
-.I
I
I
I
I
:
:
:
I
I
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I
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I
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L---:--®---,---+----0
,
,
I
I
LP2
DI
F=rr~~·----~----L---1f----J
I
LPl
II
, I
AO>-----T----,
N~------
-
' :
____ .1
1
I
\D=====~7===~~====~~~~~==3E===c~~
L______
_________________________
__------~
I
_~
3.
IdentiiY these symbols used in the above diagram.
I
f~
4.
A
0--
Luminaire
How many are
required?
IdentiiY the symbols listed below from the supplied diagram.
O~----L~;~
~>----..~
L2
I
TOL
L5~
One way switch single
pole
o
A2
O-+-~~L~3~rA3~~~~
Luminaire fixed to a wall
How many are required?
-y ------------
P",,,h button switch
Socket outlet for
television
I
I
E---\
---------i~
Circuit diagram - motor starter
MEC076 Engineering Drawing Interpretation I
Resource Package
December. 1998
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100
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MEC076-7-7
I
Application of welding symbols
Symbolic representation of weld positions
Drawings showing weld positions as a picture.
Note:
II
I
Il
I
Each symbol should be used only once on a real drawing not repeated on views.
(Three possible positions shown)
I
~
g
I
~
I
~
"
f'.
v
v
4
I
I
~
(Two possible positions shown)
/I
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(~:t1:t1~~
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/~
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-
t>
I
l
1'I1l'1l"'!"'lIIl
I
!
I
I
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I' !
I
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I' !
I
I
MEC076 Engineering Drawing Interpretation 1
Resource Package
December. 1998
\
-
"
,..--...
v
( Two possible positions fO~
each weld symbol shown
~
I
~s
t
I
I
I
!
I
I
'-
'-
I
'-
~
I
[7
[7
I
/
v
~
v
(Correct application of symbols)
,,1 it:o
102
MEC076 -7 - 9
Welding Symbols
Welding symbols on drawings are shown in:
AS1101 - Graphical Symbols for General Engineering - Part 3 Welding and Non Destructive Examination.
Students should refer to the standard for more detailed information.
Welds - Fillet
Elements of a weld symbol
The symbol
The arrow
Type of weld
Sketch of weld
Examg-
The line
Symbol
Example
/
/
This is a reference line drawn parrallel
to the base line of a particular view. The
position of the symbol above or beneath this
line determines the location of the weld.
Fillet
The arrow pOints to the position of
the welded jOint.
Location of weld symbols
Symbol above the line weld
joint opposite side to arrow.
/
Sketch of weld
Indication on
drawing
Symbol beneath the line
weld joint, the same side
as the arrow.
Indication on
drawing
MEC076 Engineering Drawing Interpretation 1
Resource Package
December. 1998
r
Weld all round
Symbol beneath the line
Weld
both
sides
Sketch of weld
The symbol
To be welded on site
or
site weld.
Sketch of weld
Indication on
drawing
Supplementary symbols
~
~
h"
Combination of site weld
and weld all round.
it:n
Symbol
r
Indication on
drawing
Indication on
drawing
~
101
Indication on
drawing
Symbol
0
Sketch of weld
Sketch of weld
Symbol above the line
v
I
MEC076 - 7 - 8
Exercise 7 - 3,"
identify and complete the following table of symbols taken from drawing 02 -MF1 - MY82
Sheet MEC076 - 7 - 11
~
/
~
~
Fillet weld size 6mm both sides of the web
C3
~
/
C3
C3
~3V
C3
Fillet weld size 6mm both sides of the web
C5
UNO
D2
M,S,
D5
@.Ej
A1
I
<&1fVA
B5
0
B4
Radius 35
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
B3
6,1;':0
103
MEC076 - 7 - 10
I
Page 104
MEC076 - 7 - 11
I
1
I
2
r
; -03 oil hole
I
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'-41-"
I
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A
2 -
(B-
\
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5
4
6
DO NOT SCALE
ALL DIMENSIONS IN MILLIMETRES
.012-4 holes
,
(®'
1
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,
3
,_
\
,
,
I
',.'
A
--------,+-----+-;--------- --
-
--'----+-
/~,-'
'.
,
,
\
!
'
'"
'I'
"
,I,,
"
t
!
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80
/--A
B
B
R35
-L
3
~
1 ' / / /, / /
,
I,
.,.-------- - - - f-- - - ,
f-j-
. - - - - - _1, ____ _
-
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V///I////
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C
/
a
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PARTS liST
1
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'140
!200
.1
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A
All welds 6mm fillet UNO
o
r--T--~r-_r-----------T_-~~~ UNLESS
NOTED OTHERWISE
TOLERANCES ARE:
LINEAR:
A
ISSUE
FIRST ISSUE
7/3/98
DATE
ZONE
1
CHANGE
AMENDMENTS
I
ECN
2
LZ
BB
BY
CKD
I
±O.5
3
ROUND BAR
.025x6
MS
4
MINOR WEBS
7Ox8x56
MS
3
ROUND BAR
.06Ox80
MS
2
MAIN WEB
20Ox8x135
MS
1
BASE PLATE
20Ox10x120
MS
ITEM
I-C:-:HE-:-:C.,,-KE.,,-D,----,:J,::B--lTITLE
APPROVED
BB
ISSUED
7 - 3 - 98
RECORD OF ISSUE
MATERIAL:
M.s.
FINISH
UNO
10/
DESCRIPTION
SIZE
MATL
MANUFACTURING AND ENGINEERING
FDI Jr:ATlnNAL SERVIr:ES DIVISION
@-ct-
ANGULAR: ±O" - 30'
DRAWING PRACTICE
AS 1100
5
A
4
SCALE
1:2
SHAFT SUPPORT BEARING
SIZE DRG N°
A3
5
02 - MF 1 -- MY 98
I
6
SHT
1 OF 1
0
Fluid power symbols
Crossing lines NOT
CONNECTED
(no dot at the
intersection of the
Fluid power symbols are standardised in:
AS1101 • Graphic Symbols for General Engineering Part1 • Hydraulic and Pneumatic Systems
Fluid power is the umbrella term for both hydraulic and pneumatic systems.
lines)
Atmospheric reservoir
LJ
Header line
y
being shown. They also normally show a return to an external reservoir. L.J
C>- being
Pressure gauge
Fluid flow symbols
Heat engine (internal
combustion engine)
-I>
Hydraulic
2/2
2 ports/2 positions
Outlet pneumatic
U
EJ
Uni-directional hydraulic
pump
Mechanical connection
0
Electric motor
5/2
5 ports/2 pOSitions
0
4/3 4 ports/3 pOSitions
with a float centre
--
5/3 5 ports/3
positions with a closed
Flow generator symbols examples
U==0
Power supply
Line ending below the fluid
level
L1
~
Line ending above the
fluid level
~
cp
Temperature gauge
Flowmeter
-0-
3/2
3 ports/2 positions
[ nXI
Directional control valves
Flow generator symbols
Un i-directional
compressor
(pneumatic)
+
Gauge symbols
shown. They also normally show a return to an exhaustport.!>
Pneumatic
--v-
Hydraulic and Pneumatic
Fluid storage unit symbols
In most cases hydraulic circuits can be identified by the simplified general symbol ~
Pneumatic circuits can usually be identified by the simplified general symbol
+
CrOSSing lines not
connected
(the arc does not
indicate a flexible line)
~
IIlil
I~lllirl
[TIHXI
3/2
3 ports/2 positions
lGGSJ
[ n:;;lxl
4/3 4 ports/3 positions
with a closed centre
II n~lxl
4/3 4 ports/3 positions
with a tandem centre
4/34 ports/3 positions
with a open centre
5/35 ports/3 positions
with
I:;;IHXI
l~lllIllllrl
a float centre
Il\Uhmll
centre
C)===EJ
Manual actuation methods
General manual
8
operation
1=
(j=
Push button operation
Lever operation
=f
Fluid conductor symbols
Working line (feed &
return lines)
Flexible working line (a
pilot or drain flexible
line could also be
drawn)
Drain line (short dashes)
Pilot line (long dashes)
A teed connection (the
dot at the join indicates
the connection)
A croGsed connection
(the dot at the join
indicates the crossed
connection)
+
Air service unit symbols
Detailed symbol
,._._._.-.-.
~Q,
'YIA:
i. /!'-.
:,
!.
~
!
MEC076 Engineering Drawing Interpretation I
Resource Package
December. 1998
", it:o
105
L•• J
Simplified symbol
I
MEC076 -7
-121
Examples of pneumatic circuits
Shut-off valve
-I><J-wr<:)-
Spring loaded check
Basic check (non-return
valve)
¢§t
Shuttle valve
~---.
Pilot pressure te close
check (non-return valve)
Pilot pressure te Open
check (non-return valve)
--c)Pneumatic circuit
~---.
Pressure control valve actuation methods
1+
I
Actuator symbols
Single acting load or gravity
return pisten type cylinder
Single action spring return
pisten type cylinder
Double acting pisten type
cylinder
Single acting load or return
ram type cylinder
Double acting ram type
cylinder
Hydraulic mater
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
Pneumatic motor
Meter-out
Exhaust throttle
-0-
-0-
h..,ilJ
106
MEC076 - 7 - 13
Examples of hydraulic circuits
Exercise 7-4
Identify and complete the following questions and statements.
Hydraulic circuit
1.
What type of circuit is this?
2.
What type of circuit is this?
taken from the circuits shown in this section.
+1I----11 I 1
Lever operation
Push button operation
Ii\illli
Atmospheric reservoir
Bleed off
Meter out
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
Meter in
[ TIiilXI
" , ;tj
107
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MEC076 - 7 - 14
I
Mechanical symbols
Mechanical symbols are featured in this art of the section. For more detailed information, students should refer to AS1100 - Part 201 - Mechanical Drawing.
Physical features
Tap
s:
a
~
s:
The cutting tool used to produce internal
screw threads
Blind hole
Through hole
Drill
A hole which is partly drilled through an
object.
To make a cylindrical hole with a cutting tool
called a twist drill.
A hole drilled through the entire thickness of
an object.
i5
D
Twist
drill
~M10tap
Drill.010
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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"it:a
108
MEC076 - 7 - 15
Physical features
fitch circle diameter
The diameter of a circle centre line on which
holes or other features are located.
Pitch circle
diameter
Clearance
Web
Spotface
A thin flat member acting as a brace or
support. It increases strength without
greatly increasing weight.
A circular machined area around a hole at
right angles to the axis of the hole.
Spotface
8 holes
On 150 PCD
That space provided between parts or a
mechanical assembly to ensure easy
separation of the parts.
12
Drillf212
Uf2 20:r:1
I
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I
I
I
I
..L-
B------1
SectB-B
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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109
-
Clearance not shown
unless excessive
Front view
I
MEC076 - 7 - 16
I
Physical features
Spigot
A protruding cylinder or plug which fits into a
mating hole so that parts can be fitted
together.
Shaft
Taper
Spoke
1.
2.
Anyone of the bars which connect the rim
and hub of a wheel.
An incline plane surface.
The conical form given to a pin or shaft
(like the end of a pencil) or hole.
A cylindrical p'iece of metal used to carry
rotating machine parts such as pulleys or
gears, to transmit power or motion.
Spoke
Inclined plane
Spigot
Pin 15haft
1~
Rim
--=_
L.-_ _ _
1: 4
f!l20
E::::=-h
Inclined plane
Top view
Front
view_--------l
Pin I shaft
Front view
I
Spoke
Front view
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
h" iI ill
110
I
MEC076 - 7 - 17
I
Physical features
Boss
Pad
Bush
Rivet
A hollow cylindrical lining inserted in a hole in
machinery to act as a bearing for a shaft or
spindle.
A cylindrical rod of soft metal with one head
formed when manufactured. A head is
formed on the other end after the rivet has
been inserted in the drilled or punched hole of
mating parts
A slight irregular shaped projection above
the surrounding surface of a casting or
forging, usually to provide a bearing surface.
A cylindrical projection on a casting or
forging which provides extra thickness for
tapping, or a seat for the head of a bolt or
screw.
Bush
Pad
Rivet
n
05 Rnd Hd rivet
5.1 I.
32
MEC076 Engineering Drawing Interpretation 1
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December, 1998
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020
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MEC076 - 7 - 18
I
Physical features
Radius
An external rounded corner formed to enable
better fits between parts and to reduce risk
of injury.
Eccentric
Stepped
The position of a shaft whose axis does not
coincide with the position of the axis of the
main part of the shaft (off-centre).
Having increases in height or diameter
shaped like steps.
Shoulder
A raised section of a shaft or surface which
prevents movement along the surface or
permits bearing against.
'-',,_ _---,Shoulder
Stepped
block -shaft
-&---B---i-,------ +---\-----
+----15
MEC076 Engineering Drawing Interpretation 1
Resource Package
December. 1998
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MEC076 -7 -19[
Physical features
Collar
Chamfer
Recess
Fillet
<:
o
~
<:
i5
A circular flange or ring secured on a shaft to A flat surface cut on the intersection of two
prevent sliding.
surfaces usually cut at 45°.
The mating hole into which a spigot fits.
An internal rounded intersection of two
surfaces which prevents the forming of
weakness planes in castings or forgings.
D
Recess
Chamfer
,.--_ _'""'\.I
060
I'
050
12 x 45 °
R5
030
f\..iEC076 Engineering Drawing Interpretation 1
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December, 1998
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I MEC076 - 7 - 20 I
Physical features
Setscrew
Key
Jig
Key:
s::
a
:es::
~
D
A headed fastener usually screwed along its
complete length and screwed into a tapped
hole rather thanoa nut, for the purpose of
locking or setting.
A holding device that holds work and guides
the cutting tool during a machining
operation.
Keyseat:
Keyway:
Keyway
Split lug
Keyseat
A small piece of metal fitted axially
partly in hub and shaft to prevent
rotation.
The slot in a shaft into which the key is
fitted.
A slot in the hub or portion surrounding
a shaft to receive a key.
A lug usually projecting from a boss or hub both of
which are sawn tnrough to produce a clamping effect
when the lugs are clamped together.
Key~
Split Iug,.......:::::::==;:::::-...
Drill jig
M12 x 1.
setscrew
Locknut
~ -1--4I
_
~
_
RJ30
06.10
06.05
<:II
s::
III
OJ
a
~
-e
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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I
I
I
I
I
I
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RJll
....! _ c
I
I
I
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III
R15
I
I
.s::
o
I
I
I
I
I
I
I
I
1____________ _
R10
fit'U)
114
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MEC076 - 7 - 21
I
Physical features
Dovetail
Knurl
A wedge-like section which slides in a slot of
the same shape preventing lift.
Dowel pin
To impress a pattern of dents or lines in a
turned surface to provide a better grid.
A cylindrical pin partly located in each of two
contacting surfaces to prevent sliding
between the surfaces.
Fillet runout
A line of intersection formed by the junction
of a fillet and another fillet.
Fillet
run out
Dovetail
slides
Dowel pin
Knurling tool
Lathe chuck
r-.025
n
----~----
med kn uri
60°
I
IV
V
1---
Drill 011.5, ream 012
for 012 dowel
-~---
R6
typ
50
MEC076 Engineering Drawing Interpretation 1
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December, 1998
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I MEC076-7-22I
Metric screw threads
Drawing proportions for metric hexagon bolts, screws, nuts and washers
ISO
COARSE PITCH SERIES
PREFERRED SIZES
-6--3----~-0_--
Designation
(dia in mm)
I
External
M1,6
M2
M2,5
M3
M4
M5
M6
M8
MlO
M12
M14
M16
M20
M24
M30
M36
M42
D~
EB--F--+
Hexagon
bolt
Pitch
(mm)
Lentlth
D
$A
0,35
0,4
0,45
0,5
0,7
0,8
1
1,25
1, 5
1,75
2
2
2,5
3
3,5
4
4,5
BE
- - ~-L i - - - - -
..L.
:y
J
A
1.70£1
c
B
.5A
E
1.5£1
,
G
F
D
.7£1
'---- Bolt dia (0)
{I~
-® Q--fi
Q JKL
to
--g--l--l
G
F
C
Bolt
dia
rl
H
K.5£1
J
2£1+
.8£1
+
rJL
L
2£1
N
£1+1
P
6
M5
10
5
5
4
8
1
16
3
4
3
10
6
1
M6
12
6
6
5
9
1
18
4
5
3
12
7
1
M8
14
7
8
6
12
1
22
5
6
4
16
9
1
M10
18
9
10
7
15
1
26
5
7
5
20
11
1
Specifications
M12
20
10
12
8
18
1
30
6
8
6
24
13
1
For general purposes in engineering the coarse thread series should be used. The thread is
identified by the letter 'M' followed by the thread diameter in millimetres. The pitch of the
thread and the length of the thread are only shown in special cases. Where critical control of
the thread form is required a tolerance should be specified.
M14
24
12
14
10
21
2
34
7
10
7
28
15
2
M16
28
14
16
12
24
2
38
8
11
8
32
17
2
M20
34
17
20
14
30
2
46
9
13
10
40
21
2
M24
42
21
24
17
36
2
54
11
16
12
48
25
2
ES6cntial-
10mm nominal diameter thread
· h f h
d
P ItC 0 t rea
MEC076 Engineering Drawing Interpretation 1
Resource Package
December, 1998
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T
f
See bolt drawing
M10 x 1.5 x length x tOler~ecial only)
Not required if ISO
coarse thread used
Examples:
eg: 6H internal
6
t
I
g ex erna
Ml0'25~
(Simple sizing)
""B
116
.
."M"".lO'6H
(Tolerance sizing)
I
MEC076 -7 - 23
1
2.
Exercise 7-5
What does fCD mean? _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
Complete the following questions and statements.
8 holes M10
On 150 peD
1.
Identify by description the hole types shown.
@E--3
;0.1
Hole D12
.012
0
.012 J10
.012 LJ.025
,0.5
0
.010 LJ.012 J10
M10
.06 v.012 x 90°
Pictorial
--&r--
3.
Orthogonal
Identify and name the part marked by the arrow A.
B---l
II
A
12
A
~
/
Hole 1
Hole2
-
Hole 3
Sect B-B
Hole4
Front view
Hole 5
Hole 6
Hole7
MEC076 Engineering Drawing Interpretation 1
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December, 1998
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! MEC076-7-24!