MECH220_DRAWING-1-1

8/19/2019 MECH220_DRAWING-1-1

1/34

Inst. Charbel Seif, MECH 220 03/21/16 1

MECH 220MECH 220

Engineering GraphicsEngineering Graphics

TECHNICAL DRAWINGSTECHNICAL DRAWINGS

Inst.: Charbel Seif

Office: SRB room 410 Extension: 362

e!mail: cs0"#a$b.e%$.lb

8/19/2019 MECH220_DRAWING-1-1

2/34


MECH 220: 1st LECTUREMECH 220: 1st LECTURE

TopicsTopics

Design process

Definition of a drawing

Drawing Format & sies

Anatom! of a drawing Free"and S#etc"ing

Tec"ni$%es

S#etc"ing Eercise

8/19/2019 MECH220_DRAWING-1-1

3/34



Design ProcessDesign Process

Design process

8/19/2019 MECH220_DRAWING-1-1

4/34



Design is an Iterative ProcessDesign is an Iterative Process

'egins wit" a recognition of aneed for a prod%ct( ser)ice( ors!stem

T"e idea p"ase enco%rage awide )ariet! of so*%tionst"ro%g" +rainstorming(*iterat%re searc"( and ta*#ingto %sers

'est so*%tions are se*ectedfor f%rt"er refinement

,ode*s or protot!pes aretested and pro+*ems ma!arise re$%iring new so*%tionsand ret%rn to an ear*ier stagein t"e design process

Fina**! drawings are re*eased

for man%fact%ring

8/19/2019 MECH220_DRAWING-1-1

5/34



Engineering Design Uses Setching ! C"DEngineering Design Uses Setching ! C"D

Ideas are initia**! s#etc"ed t"en more acc%rate CAD drawings are

created

A sing*e acc%rate CAD data+ase can +e %sed to go from ideationto man%fact%ring and doc%mentation-

Finite E*ement Ana*!sis( .D rendering( animation( doc%mentation(

rapid protot!ping too*s are a)ai*a+*e for %se wit" CAD-

Tec"nica* drawings are generated to proceed in t"e

man%fact%ring p"ase

8/19/2019 MECH220_DRAWING-1-1

6/34

8/19/2019 MECH220_DRAWING-1-1

7/34Inst. Charbel Seif, MECH 220 03/21/16 7

MECH 220: 1st LECTUREMECH 220: 1st LECTURETECH#IC"L DR"$I#G:TECH#IC"L DR"$I#G:

DE%I#ITIDE%I#ITITECHNICAL DRAWING is a “formatted document

that specifies the required attributes of a part to be

manufactured”.

DRAWING ATTRI'0TES11' GE&METRIC:

dimensions & tolerances

factors of form (flatness, squareness..)

2' CSTRUCTI:

material, assembly, finish,..

8/19/2019 MECH220_DRAWING-1-1



TECH#IC"L DR"$I#GSTECH#IC"L DR"$I#GS

F/R,AT

8/19/2019 MECH220_DRAWING-1-1



TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS:

Dra(ing %or)atDra(ing %or)at ANSI 2A,ERICAN NATI/NAL STANDARDS

INSTIT0E31

Eng*is" %nits 2inc"es3

– ANS!A

– ANS!"

– ANS!# – ANS!$

– ANS!%

DIN 2DE0TSCH INSTIT0TE NATI/NAL31

SI %nits 2mm( m3

– $N!A

– $N!A'

– $N!A

– $N!A

– $N!A*

IS/ 2INTERNATI/NAL STANDARDS/RGANI4ATI/N3

SI %nits 2mm( m3

– S+!A

– S+!A'

– S+!A – S+!A

– S+!A*

5IS 25A6ANESE IND0STRIAL STANDARDS3

SI %nits 2mm( m3

– S!A – S!A'

– S!A

– S!A

– S!A*

8/19/2019 MECH220_DRAWING-1-1



TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS:

Dra(ing Si*esDra(ing Si*es DRAWING /7ERALL SI4E 6L/TTING AREA 2appro-3

A,ERICAN 2ANSI3

– A *.-” $% / 0.**” 121 3.-*” $% / .-” 121

– " 4.*” $% / *.*” 121 -.*” $% / 4.-” 121

– # .*” $% / 4.*” 121 3.-” $% / .-” 121

– $ '.-” $% / .*” 121 '*.*” $% / 4.**” 121

– % '.*” $% / ''.*” 121 *.-” $% / 0.**” 121 – 55..

/THER 2DIN( 5IS( IS/--3

– A 0-mm $% / 30mm 121 – A' '34mm $% / 6'mm 121

– A -6*mm $% / '34mm 121

– A 06mm $% / -6*mm 121

– A* 4-mm $% / 06mm 121

8/19/2019 MECH220_DRAWING-1-1


MECH 220: TECH#IC"L DR"$I#GS:MECH 220: TECH#IC"L DR"$I#GS: S"MPLESS"MPLES

ANSI8C $N!a'

IS/8a. S!a'

8/19/2019 MECH220_DRAWING-1-1




ANAT/,9 /F A DRAWING

8/19/2019 MECH220_DRAWING-1-1


MECH 220: TECH#IC"L DR"$I#GSMECH 220: TECH#IC"L DR"$I#GS

TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS: the anato)+ o, a -ra(ingthe anato)+ o, a -ra(ing

2%N%7A8 9::N2 ;7+%#:

A

8/19/2019 MECH220_DRAWING-1-1

14/34



TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS: 1. Main /oc Description1. Main /oc Description

2%N%7A8 9::N2 ;7+%#:

A

8/19/2019 MECH220_DRAWING-1-1

15/34



TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS: 2. Revision /oc 2. Revision /oc

7%?S+NS

7%?S+N "8+#@

8/19/2019 MECH220_DRAWING-1-1

16/34



TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS: . Materia Caot. Materia Caot

,ATERIALS CALL/0T S6ECIFIES1

– :;% +9 =A:%7A8 & 1%A: :7%A:=%N:>

%Bamples> Aluminum 4*4C:4 dieCcast Aluminum

A'4*

– S

%Bamples> S Apply #hromate coatinE#lass prior to paintinE blacF (color chip BBBC

BB) polyurethane ($oG #hemical pHn BBBBB).

8/19/2019 MECH220_DRAWING-1-1

17/34



TECH#IC"L DR"$I#GS:TECH#IC"L DR"$I#GS: 3. #otes3. #otes

N/TES S6ECIF91 – $imensioninE conDention>

%Bample> draGinE dimensions in accordance Gith ANS .-=C30.

– $imension :olerances>

%Bample> obey tolerance blocF for dimensional

tolerances unless otherGise specified.

– 7ecommended ;art =anufacturer.

%Bample> oe #ool :ool & $ie nc.

' =ain Street

Acme,

8/19/2019 MECH220_DRAWING-1-1

18/34




SA,6LE DRAWING

8/19/2019 MECH220_DRAWING-1-1

19/34



Sa)pe Mech 220Sa)pe Mech 220 Intro to Cad Intro to Cad Pro4ectPro4ect

97+N: ?%

2%N%7A8 9::N2 ;7+,%#:

A

8/19/2019 MECH220_DRAWING-1-1

20/34



%reehan- Setching%reehan- Setching

0ti*it! & Tec"ni$%es

8/19/2019 MECH220_DRAWING-1-1

21/34



%reehan- Setching:%reehan- Setching: Utiit+Utiit+

Free"and s#etc"ing is %sed in engineering

grap"ics to $%ic#*! comm%nicate !o%r

ideas or designs-

Drawing instr%ments and CAD are not

a*wa!s a)ai*a+*e( especia**! d%ring fie*dtrips

Free"and s#etc"es are %sed to

comm%nicate wit" ot"ers( so t"e! s"o%*d

+e neat and correct*! prepared-

Free"and s#etc"ing is not s*opp!

s#etc"ing: 9o%r s#etc"es need to +einterpreted +! ot"ers in !o%r design team ;

%se good *ettering-

8/19/2019 MECH220_DRAWING-1-1

22/34


MECH 220: 1st LECTUREMECH 220: 1st LECTURE Setche- LinesSetche- Lines

Line patterns comm%nicatew"at t"e *ine represents in

t"e drawing

Line patterns te** !o%

information s%c" as w"et"er

t"e *ine is "idden( )isi+*e( or acenter*ine

?isible line

1idden line

1atchinE

#enterline

Dimension EtensionLeader

#uttinE ;lane

?ieGinE ;lane

Short breaF

8onE breaF

;hantom

Stitch

#hain

8/19/2019 MECH220_DRAWING-1-1

23/34



Setche- LinesSetche- Lines

8/19/2019 MECH220_DRAWING-1-1

24/34


H' 2

8/19/2019 MECH220_DRAWING-1-1

25/34



Setching LinesSetching Lines

Horionta* *ines are drawnfrom *eft to rig"t

7ertica* *ines are drawn from

top to +ottom

Inc*ined *ines are drawn in t"e

downward direction

8/19/2019 MECH220_DRAWING-1-1

26/34



Setching CircesSetching Circes

Identif! t"e Circ*e centre

Draw t"e "orionta* and )ertica* center*ines

Identif! minim%m @ point E$%idistance from t"e center

Draw s"ort arc passing t"ro%g" t"ose points Connect arcs

8/19/2019 MECH220_DRAWING-1-1

27/34



353 Gri- setching paper353 Gri- setching paper

Grid paper is %sedas a sca*ing too*

> +oes per in arepro)ided a*ong t"e"orionta* and)ertica* directions

8/19/2019 MECH220_DRAWING-1-1

28/34



656 Gri- setching paper656 Gri- setching paper

@ +oes per in arepro)ided a*ong t"e"orionta* and)ertica* directions

8/19/2019 MECH220_DRAWING-1-1

29/34



%reehan- setching e5ercise

8/19/2019 MECH220_DRAWING-1-1

30/34



E5a)pe %reehan- Setch ,or Concept Deveop)ent

8/19/2019 MECH220_DRAWING-1-1

31/34



S))ar+S))ar+

Engineering drawing can +e a %ni)ersa* *ang%age to comm%nicate

!o%r ideas-

T"e engineering design process %ses s#etc"ing and CAD to

comm%nicate and record ideas-

A sing*e CAD data+ase can +e %sed to prod%ce man! t!pes of

drawings and mode*s %sed t"ro%g"o%t t"e design process-- ie1 NC

man%fact%ring( inspection( s"ipping containers

8/19/2019 MECH220_DRAWING-1-1

32/34



"ssign)ent ,or ne5t (ee"ssign)ent ,or ne5t (ee

Assignment wi** +e posted on ,oode*

A grided paper is a)ai*a+*e /n ,oode*

8/19/2019 MECH220_DRAWING-1-1

33/34



Ter)inoog+Ter)inoog+

#A$> Comp%ter Aided Design

#A$$> Comp%ter Aided Design & Drafting

#A=> Comp%ter Aided ,an%fact%ring

#=> Comp%ter Integrated ,an%fact%ring

#A%> Comp%ter Assisted Engineering

7eadinE $raGinEs> Interpreting drawings made +! ot"ers

:echnical $raGinE> Drawings %sed to epress tec"nica* ideas

%nEineerinE $esiEn 2raphics> Tec"nica* Drawings representing designs &

specifications for p"!sica* o+ects

8/19/2019 MECH220_DRAWING-1-1

34/34



T"an# !o%

Documents

MECH220_DRAWING-1-1