SlideShare una empresa de Scribd logo
1 de 33
Descargar para leer sin conexión
20MEGO1 – Engineering Graphics
Preparedby:
M. SundraPandian, M.E., M.B.A.
Assistant Professor, Department of MechanicalEngineering,
Sri RamakrishnaInstituteof Technology, Coimbatore - 10
Syllabus
Curve Constructions and OrthographicProjection (Module 1)
Lettering – Types of lines – Dimensioning – Conics- Construction of ellipse,
parabola and hyperbola by eccentricity method - Construction of cycloid - Construction of
involutes of square and circle- Drawing of tangents and normal to these curves. Principles of
Orthographic projection – Layout of views Orthographic projection of simple Engineering
components using first angle Projection. Drawing of multiple views from pictorial views of
objects.
Cycloids
What is a Cycloid?
The curves generated by a fixed point on the circumference of a circle, which rolls
without slipping along a fixed straight line or a circle.
The rolling circle is called generating circle and the fixed straight line or circle is
termed directing line or directing circle.
Cycloids
A circle of 50 mm diameter rolls along a straight line without slipping. Draw the curve traced
out by a point P on the circumference, for one complete revolution of the circle. Draw a
tangent andnormalto thecurve.
ø50
• Draw a circle of given dia.5o mmand mark
itscenteras C.
C
.
• Divide thecircle into8 equalpartsand name
it as 1, 2,3,…until8 as shown.
2
1
3
4
5
6
7
8
• Draw a horizontal line 8 – 8’ passing
through point ‘8’ and length equal to the
circumference of the circle.
L = Circumference = 2R = 2 x  x 25 = 157 (approx.)
8’
Cycloids
• Divide the horizontalline intoas manyequal
partsas the circle is divided,here it is 8 equal
parts.
C
. 2
1
3
4
5
6
7
8 8’
1’ 2’ 3’ 4’ 6’
5’ 7’
• Drawhorizontal lines frompoint s 1, 2, 3, … 7.
• Drawperpendicular lines frompoint s 1’, 2’,
3’, … 8’.
C1 C2 C3 C4 C5 C6 C7 C8
• The point of intersectionof center line
through C and verticalline from1’ is C1.
SimilarlymarkC2, C3,…C8.
Cycloids • Nowcut an arcwith radiusas the radius of
the generatingcircle,i.e.,25 mmand cut the
horizontal line 1. Thiswillbe P1.
C
. 2
1
3
4
5
6
7
8 8’
1’ 2’ 3’ 4’ 6’
5’ 7’
C1 C2 C3 C4 C5 C6 C7 C8
P1
• NowC2 as center and radius25 mm,cut
anotherarc cutting the line passing through
2. Name it as P2.SimilarlycontinuetillP8
P2
P4
P3 P5
P6
P7
P8
• Join points8, P1,P2, …P8.This curve is called
the cycloid.
Cycloids
• Locatea randompoint P on the cycloid.
C
. 2
1
3
4
5
6
7
8 8’
1’ 2’ 3’ 4’ 6’
5’ 7’
C1 C2 C3 C4 C5 C6 C7 C8
P1
P2
P4
P3 P5
P6
P7
P8
P
• Withthe point as centerand radiusequalto
the radiusof the generatingcircle,25 mm,cut
an arcat the line passing throughC.
M
O
• The arccutsthe center line throughC at M.
• Drawa  line fromM to the line 8 – 8’ and
name it as O.
• Join PO this is the normal
• Drawa  line to PO at P and thisis the
tangent.
Application of Cycloidcurves
In Engineering designs like, gear tooth profile design.
Involute
The curves traced out by an end of a piece of thread unwound from a circle or a
polygon, the threadbeingkept tight.
It may also be defined as a curve traced out by a point in a straight line which rolls
without slipping along a circle or a polygon.
Involute
The involute curves are used in the determination of length of belt used for
pulleyconveyors and also determining the amount of material used for tyres and wheels.
Involute
Drawthe involuteof a square of side or edge 30 mm.
• Draw asquareof side30 mm andmarkit as A, B,
C andD asshown.
30
A
B
D
C
• Extendthe edgeCB, DC, AD andBAasshown.
Involute
• WithB as centerandBA as theradius,drawan
arcto cut thelinethroughB at 1.
A
B
D
C
1
• WithC ascenterandC1 astheradius,drawan arc
to cutthelinethroughC at 2.
2
• WithD ascenterandD2 astheradius,drawan
arcto cut thelinethroughD at 3.
3
• WithA ascenterandA3 astheradius,drawanarc
to cutthelinethroughA at 4.
4
Involute
A
B
D
C
1
2
• Join1, 2, 3 and4 witha smoothcurve
3
4
Involute
Drawthe involuteof a circleof radius 25 mm.
• Drawa circleof radius25mmandmarkthecenter
asC.
a
Ø 50
. C
• Dividethecircleinto8 equalpartsandmarkthe
pointsasshown.
1
2
3
4
5
6
7
8
Involute
• Drawtangentsto thecirclefromalltheeight
points.
a. C
1
2
3
4
5
6
7
8
8’
• Make sure that the last tangent through the point
touching the ground should be of length equal to the
circumferenceof the circle.
L = 2R
• Dividetheline8 – 8’ intoasmanyequalpartsas
thecircle,i.e., into8 equalparts.
1’ 2’ 3’ 4’ 6’
5’ 7’
P
• Renamethepoint8 as pointP. Thispointisthe
endof thethreadthatisgoingto beunwound
aroundthecircle.
Involute
• WithP-1’as radiusswingan arcto cutthetangentthrough1 at P1.
a. C
1
2
3
4
5
6
7
8
8’
1’ 2’ 3’ 4’ 6’
5’ 7’
P
P1
• WithP-2’ asradiusswinganarcto cutthetangentthrough2 at P2 untilP8.
P2
P8
P3
P4
P5
P6
P7
Involute
• JointhepointsP1,P2, P3…P8. Thisistheinvoluteof thecircle.
a. C
1
2
3
4
5
6
7
8
8’
1’ 2’ 3’ 4’ 6’
5’ 7’
P
P1
P2
P8
P3
P4
P5
P6
P7
Involute – Tangent and Normal
a. C
1
2
3
4
5
6
7
8
8’
1’ 2’ 3’ 4’ 6’
5’ 7’
P
P1
P2
P8
P3
P4
P5
P6
P7
M
N
O
Orthographic Projection
If straight lines are drawn from various points on the contour of an object to meet a
plane, the object is said to be projected on that plane.
The figure formed by joining, in correct sequence, the points at which these lines
meet the plane, is calledthe projection of the object.
The lines fromthe object to the plane are calledprojectors.
Orthographic Projection
Orthographic Projection
The FOUR Quadrants
Vertical Plane or Wall
Horizontal Plane or
Ground
The FOUR Quadrants
The FOUR Quadrants
HP
VP
The Front and Top Views
Vertical Plane or Wall
(VP)
Horizontal Plane or
Ground(HP)
HP
VP
Front View
Top View
The Projection
HP
VP
FrontViewFV or Elevation
Top ViewFV or Plan
HP
VP
FrontViewor F.Vor Elevation
Top View orT.Vor Plan
The Projection
The Projection
The Projection
Drawthe front viewand top viewof the following objectsfromthe directionof the arrow
mark indicatedin the diagrams.
The Projection
Drawthe front viewand top viewof the following objectsfromthe directionof the arrow
mark indicatedin the diagrams.
x
y
F.V
T.V
L. S.V
The Projection
Drawthe front viewand top viewof the following objectsfromthe directionof the arrow
mark indicatedin the diagrams.
x
y
F.V
T.V
L. S.V
The Projection
8 8’
80 mm
1’ 2’ 3’…. 7’
Syllabus
Curve Constructions and OrthographicProjection (Module 1)
Lettering – Types of lines – Dimensioning – Conics- Construction of ellipse,
parabola and hyperbola by eccentricity method - Construction of cycloid - Construction of
involutes of square and circle- Drawing of tangents and normal to these curves. Principles of
Orthographic projection – Layout of views Orthographic projection of simple Engineering
components using first angle Projection. Drawing of multiple views from pictorial views of
objects.

Más contenido relacionado

La actualidad más candente

La actualidad más candente (20)

Eguqp
EguqpEguqp
Eguqp
 
Isometric
IsometricIsometric
Isometric
 
Eg unit 1 plane curves
Eg unit 1 plane curvesEg unit 1 plane curves
Eg unit 1 plane curves
 
Isometric projection
Isometric projectionIsometric projection
Isometric projection
 
Isometric projections
Isometric projectionsIsometric projections
Isometric projections
 
Lesson 11 Isometric Projection - Part I
Lesson 11 Isometric Projection - Part ILesson 11 Isometric Projection - Part I
Lesson 11 Isometric Projection - Part I
 
Orthographic projection
Orthographic projectionOrthographic projection
Orthographic projection
 
Lesson 13-perspective-projection
Lesson 13-perspective-projectionLesson 13-perspective-projection
Lesson 13-perspective-projection
 
Types of projections
Types of projectionsTypes of projections
Types of projections
 
Piping Isometric drawing guide
Piping Isometric drawing guidePiping Isometric drawing guide
Piping Isometric drawing guide
 
Isometric drawing
Isometric drawingIsometric drawing
Isometric drawing
 
Unit 8
Unit 8Unit 8
Unit 8
 
Isometric projection
Isometric projectionIsometric projection
Isometric projection
 
Engineering graphics
Engineering graphicsEngineering graphics
Engineering graphics
 
EG unit 1 - Plane curves
EG unit 1 - Plane curvesEG unit 1 - Plane curves
EG unit 1 - Plane curves
 
Auxiliary views
Auxiliary viewsAuxiliary views
Auxiliary views
 
B.tech i eg u5 isometric
B.tech  i eg u5 isometricB.tech  i eg u5 isometric
B.tech i eg u5 isometric
 
Isometric sketching lect 07 OF CIVIL ENGINEERING DRAWING
Isometric sketching lect 07 OF CIVIL ENGINEERING DRAWINGIsometric sketching lect 07 OF CIVIL ENGINEERING DRAWING
Isometric sketching lect 07 OF CIVIL ENGINEERING DRAWING
 
Oblique form 4
Oblique form 4Oblique form 4
Oblique form 4
 
Ge6152 engineering graphics jan 2014 an
Ge6152  engineering graphics jan 2014 anGe6152  engineering graphics jan 2014 an
Ge6152 engineering graphics jan 2014 an
 

Similar a Eg unit 1 2

Eg unit 1 2
Eg unit 1 2Eg unit 1 2
Eg unit 1 2Sundra3
 
Engineering drawing unit test soln sandes sigdel
Engineering drawing unit test soln sandes sigdelEngineering drawing unit test soln sandes sigdel
Engineering drawing unit test soln sandes sigdelsigdelsandes
 
Conics Sections.pptx
Conics Sections.pptxConics Sections.pptx
Conics Sections.pptxPradeep140613
 
geometricalconstruction-101112193228-phpapp01.pptx
geometricalconstruction-101112193228-phpapp01.pptxgeometricalconstruction-101112193228-phpapp01.pptx
geometricalconstruction-101112193228-phpapp01.pptxPraveen Kumar
 
Drawing views and Basic 2D contructions.ppt
Drawing views and Basic 2D contructions.pptDrawing views and Basic 2D contructions.ppt
Drawing views and Basic 2D contructions.pptmnafis
 
Development of surfaces of solids
Development of surfaces of solidsDevelopment of surfaces of solids
Development of surfaces of solidsSumit Chandak
 
Engineering Graphics - 1.ppt
Engineering Graphics - 1.pptEngineering Graphics - 1.ppt
Engineering Graphics - 1.pptSudhakarNakka3
 
OCW Chapter 5.pptx
OCW Chapter 5.pptxOCW Chapter 5.pptx
OCW Chapter 5.pptxFelixXZ
 
Geometricalconstruction
GeometricalconstructionGeometricalconstruction
GeometricalconstructionSaidon Aziz
 
Unit 1 plane curves engineering graphics
Unit 1 plane curves engineering graphicsUnit 1 plane curves engineering graphics
Unit 1 plane curves engineering graphicsganesasmoorthy raju
 
IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...
IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...
IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...IRJET Journal
 
Lesson 10 Development of surfaces - Part II
Lesson 10 Development of surfaces - Part IILesson 10 Development of surfaces - Part II
Lesson 10 Development of surfaces - Part IIJeyapoovan Thangasamy
 
Ge8152 engineering graphics 02- by learn engineering.in
Ge8152  engineering graphics 02- by learn engineering.inGe8152  engineering graphics 02- by learn engineering.in
Ge8152 engineering graphics 02- by learn engineering.inGopalaRaoT
 
Lesson 10-development-of-surfaces-ii
Lesson 10-development-of-surfaces-iiLesson 10-development-of-surfaces-ii
Lesson 10-development-of-surfaces-iieglive
 
EG UNIT 1PLANE CURVES.ppt
EG UNIT 1PLANE CURVES.pptEG UNIT 1PLANE CURVES.ppt
EG UNIT 1PLANE CURVES.pptGanesamoorthy14
 

Similar a Eg unit 1 2 (20)

Eg unit 1 2
Eg unit 1 2Eg unit 1 2
Eg unit 1 2
 
Engineering drawing unit test soln sandes sigdel
Engineering drawing unit test soln sandes sigdelEngineering drawing unit test soln sandes sigdel
Engineering drawing unit test soln sandes sigdel
 
Conics Sections.pptx
Conics Sections.pptxConics Sections.pptx
Conics Sections.pptx
 
Cycloidal curves
Cycloidal curvesCycloidal curves
Cycloidal curves
 
geometricalconstruction-101112193228-phpapp01.pptx
geometricalconstruction-101112193228-phpapp01.pptxgeometricalconstruction-101112193228-phpapp01.pptx
geometricalconstruction-101112193228-phpapp01.pptx
 
Drawing views and Basic 2D contructions.ppt
Drawing views and Basic 2D contructions.pptDrawing views and Basic 2D contructions.ppt
Drawing views and Basic 2D contructions.ppt
 
ISOMETRIC PPT
ISOMETRIC PPTISOMETRIC PPT
ISOMETRIC PPT
 
Development of surfaces of solids
Development of surfaces of solidsDevelopment of surfaces of solids
Development of surfaces of solids
 
Dimensioning
DimensioningDimensioning
Dimensioning
 
Dimensioning
DimensioningDimensioning
Dimensioning
 
Engineering Graphics - 1.ppt
Engineering Graphics - 1.pptEngineering Graphics - 1.ppt
Engineering Graphics - 1.ppt
 
Eg 1
Eg 1Eg 1
Eg 1
 
OCW Chapter 5.pptx
OCW Chapter 5.pptxOCW Chapter 5.pptx
OCW Chapter 5.pptx
 
Geometricalconstruction
GeometricalconstructionGeometricalconstruction
Geometricalconstruction
 
Unit 1 plane curves engineering graphics
Unit 1 plane curves engineering graphicsUnit 1 plane curves engineering graphics
Unit 1 plane curves engineering graphics
 
IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...
IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...
IRJET -, How to Encourage the Students Interest to Engineering Graphics, Meth...
 
Lesson 10 Development of surfaces - Part II
Lesson 10 Development of surfaces - Part IILesson 10 Development of surfaces - Part II
Lesson 10 Development of surfaces - Part II
 
Ge8152 engineering graphics 02- by learn engineering.in
Ge8152  engineering graphics 02- by learn engineering.inGe8152  engineering graphics 02- by learn engineering.in
Ge8152 engineering graphics 02- by learn engineering.in
 
Lesson 10-development-of-surfaces-ii
Lesson 10-development-of-surfaces-iiLesson 10-development-of-surfaces-ii
Lesson 10-development-of-surfaces-ii
 
EG UNIT 1PLANE CURVES.ppt
EG UNIT 1PLANE CURVES.pptEG UNIT 1PLANE CURVES.ppt
EG UNIT 1PLANE CURVES.ppt
 

Último

How to Write a Good Scientific Paper.pdf
How to Write a Good Scientific Paper.pdfHow to Write a Good Scientific Paper.pdf
How to Write a Good Scientific Paper.pdfRedhwan Qasem Shaddad
 
Guardians and Glitches: Navigating the Duality of Gen AI in AppSec
Guardians and Glitches: Navigating the Duality of Gen AI in AppSecGuardians and Glitches: Navigating the Duality of Gen AI in AppSec
Guardians and Glitches: Navigating the Duality of Gen AI in AppSecTrupti Shiralkar, CISSP
 
Multicomponent Spiral Wound Membrane Separation Model.pdf
Multicomponent Spiral Wound Membrane Separation Model.pdfMulticomponent Spiral Wound Membrane Separation Model.pdf
Multicomponent Spiral Wound Membrane Separation Model.pdfGiovanaGhasary1
 
me3493 manufacturing technology unit 1 Part A
me3493 manufacturing technology unit 1 Part Ame3493 manufacturing technology unit 1 Part A
me3493 manufacturing technology unit 1 Part Akarthi keyan
 
Vertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptx
Vertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptxVertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptx
Vertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptxLMW Machine Tool Division
 
EPE3163_Hydro power stations_Unit2_Lect2.pptx
EPE3163_Hydro power stations_Unit2_Lect2.pptxEPE3163_Hydro power stations_Unit2_Lect2.pptx
EPE3163_Hydro power stations_Unit2_Lect2.pptxJoseeMusabyimana
 
Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...
Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...
Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...Sean Meyn
 
Graphics Primitives and CG Display Devices
Graphics Primitives and CG Display DevicesGraphics Primitives and CG Display Devices
Graphics Primitives and CG Display DevicesDIPIKA83
 
SUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docx
SUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docxSUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docx
SUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docxNaveenVerma126
 
SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....
SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....
SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....santhyamuthu1
 
Modelling Guide for Timber Structures - FPInnovations
Modelling Guide for Timber Structures - FPInnovationsModelling Guide for Timber Structures - FPInnovations
Modelling Guide for Timber Structures - FPInnovationsYusuf Yıldız
 
Dev.bg DevOps March 2024 Monitoring & Logging
Dev.bg DevOps March 2024 Monitoring & LoggingDev.bg DevOps March 2024 Monitoring & Logging
Dev.bg DevOps March 2024 Monitoring & LoggingMarian Marinov
 
solar wireless electric vechicle charging system
solar wireless electric vechicle charging systemsolar wireless electric vechicle charging system
solar wireless electric vechicle charging systemgokuldongala
 
Lecture 1: Basics of trigonometry (surveying)
Lecture 1: Basics of trigonometry (surveying)Lecture 1: Basics of trigonometry (surveying)
Lecture 1: Basics of trigonometry (surveying)Bahzad5
 
Nodal seismic construction requirements.pptx
Nodal seismic construction requirements.pptxNodal seismic construction requirements.pptx
Nodal seismic construction requirements.pptxwendy cai
 
ChatGPT-and-Generative-AI-Landscape Working of generative ai search
ChatGPT-and-Generative-AI-Landscape Working of generative ai searchChatGPT-and-Generative-AI-Landscape Working of generative ai search
ChatGPT-and-Generative-AI-Landscape Working of generative ai searchrohitcse52
 

Último (20)

How to Write a Good Scientific Paper.pdf
How to Write a Good Scientific Paper.pdfHow to Write a Good Scientific Paper.pdf
How to Write a Good Scientific Paper.pdf
 
Guardians and Glitches: Navigating the Duality of Gen AI in AppSec
Guardians and Glitches: Navigating the Duality of Gen AI in AppSecGuardians and Glitches: Navigating the Duality of Gen AI in AppSec
Guardians and Glitches: Navigating the Duality of Gen AI in AppSec
 
Multicomponent Spiral Wound Membrane Separation Model.pdf
Multicomponent Spiral Wound Membrane Separation Model.pdfMulticomponent Spiral Wound Membrane Separation Model.pdf
Multicomponent Spiral Wound Membrane Separation Model.pdf
 
Lecture 2 .pptx
Lecture 2                            .pptxLecture 2                            .pptx
Lecture 2 .pptx
 
Litature Review: Research Paper work for Engineering
Litature Review: Research Paper work for EngineeringLitature Review: Research Paper work for Engineering
Litature Review: Research Paper work for Engineering
 
me3493 manufacturing technology unit 1 Part A
me3493 manufacturing technology unit 1 Part Ame3493 manufacturing technology unit 1 Part A
me3493 manufacturing technology unit 1 Part A
 
Vertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptx
Vertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptxVertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptx
Vertical- Machining - Center - VMC -LMW-Machine-Tool-Division.pptx
 
EPE3163_Hydro power stations_Unit2_Lect2.pptx
EPE3163_Hydro power stations_Unit2_Lect2.pptxEPE3163_Hydro power stations_Unit2_Lect2.pptx
EPE3163_Hydro power stations_Unit2_Lect2.pptx
 
Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...
Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...
Quasi-Stochastic Approximation: Algorithm Design Principles with Applications...
 
Présentation IIRB 2024 Chloe Dufrane.pdf
Présentation IIRB 2024 Chloe Dufrane.pdfPrésentation IIRB 2024 Chloe Dufrane.pdf
Présentation IIRB 2024 Chloe Dufrane.pdf
 
Graphics Primitives and CG Display Devices
Graphics Primitives and CG Display DevicesGraphics Primitives and CG Display Devices
Graphics Primitives and CG Display Devices
 
SUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docx
SUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docxSUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docx
SUMMER TRAINING REPORT ON BUILDING CONSTRUCTION.docx
 
SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....
SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....
SATELITE COMMUNICATION UNIT 1 CEC352 REGULATION 2021 PPT BASICS OF SATELITE ....
 
Modelling Guide for Timber Structures - FPInnovations
Modelling Guide for Timber Structures - FPInnovationsModelling Guide for Timber Structures - FPInnovations
Modelling Guide for Timber Structures - FPInnovations
 
Lecture 2 .pdf
Lecture 2                           .pdfLecture 2                           .pdf
Lecture 2 .pdf
 
Dev.bg DevOps March 2024 Monitoring & Logging
Dev.bg DevOps March 2024 Monitoring & LoggingDev.bg DevOps March 2024 Monitoring & Logging
Dev.bg DevOps March 2024 Monitoring & Logging
 
solar wireless electric vechicle charging system
solar wireless electric vechicle charging systemsolar wireless electric vechicle charging system
solar wireless electric vechicle charging system
 
Lecture 1: Basics of trigonometry (surveying)
Lecture 1: Basics of trigonometry (surveying)Lecture 1: Basics of trigonometry (surveying)
Lecture 1: Basics of trigonometry (surveying)
 
Nodal seismic construction requirements.pptx
Nodal seismic construction requirements.pptxNodal seismic construction requirements.pptx
Nodal seismic construction requirements.pptx
 
ChatGPT-and-Generative-AI-Landscape Working of generative ai search
ChatGPT-and-Generative-AI-Landscape Working of generative ai searchChatGPT-and-Generative-AI-Landscape Working of generative ai search
ChatGPT-and-Generative-AI-Landscape Working of generative ai search
 

Eg unit 1 2

  • 1. 20MEGO1 – Engineering Graphics Preparedby: M. SundraPandian, M.E., M.B.A. Assistant Professor, Department of MechanicalEngineering, Sri RamakrishnaInstituteof Technology, Coimbatore - 10
  • 2. Syllabus Curve Constructions and OrthographicProjection (Module 1) Lettering – Types of lines – Dimensioning – Conics- Construction of ellipse, parabola and hyperbola by eccentricity method - Construction of cycloid - Construction of involutes of square and circle- Drawing of tangents and normal to these curves. Principles of Orthographic projection – Layout of views Orthographic projection of simple Engineering components using first angle Projection. Drawing of multiple views from pictorial views of objects.
  • 3. Cycloids What is a Cycloid? The curves generated by a fixed point on the circumference of a circle, which rolls without slipping along a fixed straight line or a circle. The rolling circle is called generating circle and the fixed straight line or circle is termed directing line or directing circle.
  • 4. Cycloids A circle of 50 mm diameter rolls along a straight line without slipping. Draw the curve traced out by a point P on the circumference, for one complete revolution of the circle. Draw a tangent andnormalto thecurve. ø50 • Draw a circle of given dia.5o mmand mark itscenteras C. C . • Divide thecircle into8 equalpartsand name it as 1, 2,3,…until8 as shown. 2 1 3 4 5 6 7 8 • Draw a horizontal line 8 – 8’ passing through point ‘8’ and length equal to the circumference of the circle. L = Circumference = 2R = 2 x  x 25 = 157 (approx.) 8’
  • 5. Cycloids • Divide the horizontalline intoas manyequal partsas the circle is divided,here it is 8 equal parts. C . 2 1 3 4 5 6 7 8 8’ 1’ 2’ 3’ 4’ 6’ 5’ 7’ • Drawhorizontal lines frompoint s 1, 2, 3, … 7. • Drawperpendicular lines frompoint s 1’, 2’, 3’, … 8’. C1 C2 C3 C4 C5 C6 C7 C8 • The point of intersectionof center line through C and verticalline from1’ is C1. SimilarlymarkC2, C3,…C8.
  • 6. Cycloids • Nowcut an arcwith radiusas the radius of the generatingcircle,i.e.,25 mmand cut the horizontal line 1. Thiswillbe P1. C . 2 1 3 4 5 6 7 8 8’ 1’ 2’ 3’ 4’ 6’ 5’ 7’ C1 C2 C3 C4 C5 C6 C7 C8 P1 • NowC2 as center and radius25 mm,cut anotherarc cutting the line passing through 2. Name it as P2.SimilarlycontinuetillP8 P2 P4 P3 P5 P6 P7 P8 • Join points8, P1,P2, …P8.This curve is called the cycloid.
  • 7. Cycloids • Locatea randompoint P on the cycloid. C . 2 1 3 4 5 6 7 8 8’ 1’ 2’ 3’ 4’ 6’ 5’ 7’ C1 C2 C3 C4 C5 C6 C7 C8 P1 P2 P4 P3 P5 P6 P7 P8 P • Withthe point as centerand radiusequalto the radiusof the generatingcircle,25 mm,cut an arcat the line passing throughC. M O • The arccutsthe center line throughC at M. • Drawa  line fromM to the line 8 – 8’ and name it as O. • Join PO this is the normal • Drawa  line to PO at P and thisis the tangent.
  • 8. Application of Cycloidcurves In Engineering designs like, gear tooth profile design.
  • 9. Involute The curves traced out by an end of a piece of thread unwound from a circle or a polygon, the threadbeingkept tight. It may also be defined as a curve traced out by a point in a straight line which rolls without slipping along a circle or a polygon.
  • 10. Involute The involute curves are used in the determination of length of belt used for pulleyconveyors and also determining the amount of material used for tyres and wheels.
  • 11. Involute Drawthe involuteof a square of side or edge 30 mm. • Draw asquareof side30 mm andmarkit as A, B, C andD asshown. 30 A B D C • Extendthe edgeCB, DC, AD andBAasshown.
  • 12. Involute • WithB as centerandBA as theradius,drawan arcto cut thelinethroughB at 1. A B D C 1 • WithC ascenterandC1 astheradius,drawan arc to cutthelinethroughC at 2. 2 • WithD ascenterandD2 astheradius,drawan arcto cut thelinethroughD at 3. 3 • WithA ascenterandA3 astheradius,drawanarc to cutthelinethroughA at 4. 4
  • 13. Involute A B D C 1 2 • Join1, 2, 3 and4 witha smoothcurve 3 4
  • 14. Involute Drawthe involuteof a circleof radius 25 mm. • Drawa circleof radius25mmandmarkthecenter asC. a Ø 50 . C • Dividethecircleinto8 equalpartsandmarkthe pointsasshown. 1 2 3 4 5 6 7 8
  • 15. Involute • Drawtangentsto thecirclefromalltheeight points. a. C 1 2 3 4 5 6 7 8 8’ • Make sure that the last tangent through the point touching the ground should be of length equal to the circumferenceof the circle. L = 2R • Dividetheline8 – 8’ intoasmanyequalpartsas thecircle,i.e., into8 equalparts. 1’ 2’ 3’ 4’ 6’ 5’ 7’ P • Renamethepoint8 as pointP. Thispointisthe endof thethreadthatisgoingto beunwound aroundthecircle.
  • 16. Involute • WithP-1’as radiusswingan arcto cutthetangentthrough1 at P1. a. C 1 2 3 4 5 6 7 8 8’ 1’ 2’ 3’ 4’ 6’ 5’ 7’ P P1 • WithP-2’ asradiusswinganarcto cutthetangentthrough2 at P2 untilP8. P2 P8 P3 P4 P5 P6 P7
  • 17. Involute • JointhepointsP1,P2, P3…P8. Thisistheinvoluteof thecircle. a. C 1 2 3 4 5 6 7 8 8’ 1’ 2’ 3’ 4’ 6’ 5’ 7’ P P1 P2 P8 P3 P4 P5 P6 P7
  • 18. Involute – Tangent and Normal a. C 1 2 3 4 5 6 7 8 8’ 1’ 2’ 3’ 4’ 6’ 5’ 7’ P P1 P2 P8 P3 P4 P5 P6 P7 M N O
  • 19. Orthographic Projection If straight lines are drawn from various points on the contour of an object to meet a plane, the object is said to be projected on that plane. The figure formed by joining, in correct sequence, the points at which these lines meet the plane, is calledthe projection of the object. The lines fromthe object to the plane are calledprojectors.
  • 22. The FOUR Quadrants Vertical Plane or Wall Horizontal Plane or Ground
  • 25. The Front and Top Views Vertical Plane or Wall (VP) Horizontal Plane or Ground(HP) HP VP Front View Top View
  • 26. The Projection HP VP FrontViewFV or Elevation Top ViewFV or Plan HP VP FrontViewor F.Vor Elevation Top View orT.Vor Plan
  • 29. The Projection Drawthe front viewand top viewof the following objectsfromthe directionof the arrow mark indicatedin the diagrams.
  • 30. The Projection Drawthe front viewand top viewof the following objectsfromthe directionof the arrow mark indicatedin the diagrams. x y F.V T.V L. S.V
  • 31. The Projection Drawthe front viewand top viewof the following objectsfromthe directionof the arrow mark indicatedin the diagrams. x y F.V T.V L. S.V
  • 32. The Projection 8 8’ 80 mm 1’ 2’ 3’…. 7’
  • 33. Syllabus Curve Constructions and OrthographicProjection (Module 1) Lettering – Types of lines – Dimensioning – Conics- Construction of ellipse, parabola and hyperbola by eccentricity method - Construction of cycloid - Construction of involutes of square and circle- Drawing of tangents and normal to these curves. Principles of Orthographic projection – Layout of views Orthographic projection of simple Engineering components using first angle Projection. Drawing of multiple views from pictorial views of objects.