me2103 ch 1 introduction

ME2103 Engineering Visualization & Modelling

by:

A/P Lee Kim SengRoom: EA 04-17Tel: 6516 [email protected]

http://courses.nus.edu.sg/course/mpeleeks/personal/index.htm

http://ivle.nus.edu.sg/cwb/website/ME2103

ME2103 Course Contents1. Introduction2. Introduction to SolidWorks3. Principles of Projection4. Sectioning and Dimensioning5. Isometric & Orthographic sketching6. Limits, Fits and Tolerances7. Convention and Symmetry8. Screw and Nuts Representation9. Keys, Coupling and Locking Devices10. Welding Symbols & Representations

A/P Lee Kim Seng

CAD Tutorials

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Grouping: A – N (14 groups)

Tuesday: I, J, K, L,Wednesday: A, B, C, D,Thursday: M, NFriday: E, F, G, H.

CAD TutorialsE2 03-08 (PC6) & E2 03-09 (PC7)

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How to register on-line?

Tuesday: I, J, K, L,Wednesday: A, B, C, D,Thursday: M, NFriday: E, F, G, H.

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50%

2 unseen CAD assignments20%(Qns to be given on the day)

Tutorials CT2- CT5 30%,

CAD50%

50%Total

On-line QuizMCQs(Early Nov)

CA

Tutorials

Course Quiz50%

ME 2103 Grading

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Consumer ProductsDesigned in SolidWorks

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Medical ProductsDesigned in SolidWorks

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Electronic ProductsDesigned in SolidWorks

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Basic Manual Drawing Instruments

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Basic Manual Drawing InstrumentsPencil (H or 2H for constructions, 2B for outlines)

Set square (30 & 45 deg)

Ruler & Scale Rule

Protractors

Compass or Instrument set

Eraser & Erasing shield

Radii & Circle templates

French curve & Flexible curve

T-square

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Lines

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Types of Lines and applications

Line Description General Application

Illustration

Continuous thick line

Visible outline & edges

Continuous thin line

Dimension lines & Projection/ Extension lines

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Leader lines

Hatching/Sectioning

Outline of revolve section


Illustration




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Dashed thin line

Hidden outlines & edges


Illustration

Chain thin line

Centre lines

Chain thick line

To indicate a surface that requires additional treatment.

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Types of Lines and applicationsLine Description General

ApplicationIllustration

Chain thin line with thick short lines at both ends

Symmetry lines

Continuous thin (straight) with zigzags

Long break lines

Continuous thick (freehand) line

Short break lines

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Types of Lines and applicationsLine Description General

ApplicationIllustration

Chain thin, thick at ends and changes of directions

Cutting planes

Chain thin double-dashed

Phantom lines

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Types of Lines Available in SolidWorks

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Drawing involving Complicated Hidden DetailDescription Correct Correct Illustration Incorrect

Hidden line begins with a dash, Not a space

Hidden lines intersect with no gap in between

Hidden lines intersect at corner with no gap in between

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Drawing involving Complicated Hidden Detail

Three hidden lines meet at the corner

Hidden line begins with a space as a continuation from a visible line

Invisible arc begins with a dash

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Drawing involving Complicated Hidden DetailHidden arc begins with a space as a continuation of a visible arc

Very small arc may be made solid

Two hidden arcs meet at the point of tangency

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Scale

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What is Scale?

1:1

2:1

1:2

Half Size (reduced)

1:2

Full Size

1:1

Double Size (enlarged)

2:1

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To Specify the Scale on a Drawing

For drawings, the scale indicates the ratio of the size of the drawing of the part or machine to its actual size.

Recommended practice:

1:1 for full size

1:2 for half size and similarly for other reductions

2:1 for double size and similarly for other enlargements

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Scale on a Drawing

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Drawings

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DrawingsInternational Designation

Dimension of drawing papers (mm)

A0 1189 x 841

A1 841 x 594

A2 594 x 420

A3 420 x 297

A4 297 x 210Standard paper sizes

Standard drawing paper dimensions.

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Examples of Drawings

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Example of Assembly

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Examples of Drawings: Exploded View

Bill of Materials

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Example: ME2103 drawing sheet

Default Settings:

• 3rd Angle Projection

• A4

• Landscape

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Title Block

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What is Title Block?1. Contains vital part and/or assembly

information (drawing scale, angle of projection, part name, tolerances etc…)

2. Each organization can have its own unique version of a title block although there are different standards of title blocks (ANSI, DIN, ISO, JIS etc..)

3. Usually situated at the base of the drawing sheet with a border enclosing the drawing views.

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Example: ME2103 title block

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Example: ANSI title block

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Example: DIN title block

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Example: ISO title block

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Example: JIS title block

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Construction

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Geometric Construction of // LineA. To Draw a Line Through a Point and Parallel to a Line

A

B

C

DP

Triangle may be used instead of ruler

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Geometric Construction of // LineB. To Draw a Line Parallel to a Line and at a Given Distance

G

H

A

B

E

Triangle may be used instead of ruler

R = CD

C D

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Geometric Construction of ⊥ Line

A BPC D

E

F

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Geometric Construction: Bisecting an Angle

DA

B

C

R

r

r

F

E

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Geometric Construction of PentagonA

B

CO DE

r

R

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Application of the Pentagon shape

Famous Defense Building in USA: The PentagonA/P Lee Kim Seng

Geometric Construction of HexagonA

B

C

F

D

E

RR

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Application of the Hexagon shape

Screws, Bolts and Nuts

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Construction of an Ellipse

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Construction of an EllipseMajor Axis Method

A B

1

2

34 5

E

Ffocus

Major axis

Minor axis

1/2 Major axis

1/2 Major axisA3 B3

1 2 3 4 5

C

D

A3 + B3 = AB (Major axis)

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Construction of an EllipseTwo Circles Method

Major axis

Minor axis

BA

C

D

30°

Z

Y

E

P

Q

F

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O

30°R

A

B

C

D

E

F

G

H

R

I

J

Construction of an Isometric Ellipse

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Construction of an EllipseParallelogram Method

A B

C

D

O Major axis

Minor axis

123

1

2

3

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Construction of an Ellipse

A B

C

D

Four-Centre Method

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Tangents

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Drawing Tangents to 2 Circles

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Tangents

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Examples of Geometric Construction

External CaliperA/P Lee Kim Seng


Internal Caliper

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SpannerA/P Lee Kim Seng


Special S-WrenchA/P Lee Kim Seng


Rocker ArmA/P Lee Kim Seng

Thank You

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me2103 ch 1 introduction

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