Engineering Drawing

An Introduction

Engineering Drawing

Importance

Graphic Language & Effectiveness

Try writing the description of these pictures……………

Graphic Language & Effectiveness

And let someone attempt to make a sketch or visualize from your description.

………………..………Or these pictures

The word language is

inadequate

for describing the

sizesize, shapeshape and featuresfeatures

completely as well as concisely.

It can be found that …

Graphic Language & Effectiveness

Engineering Drawing

Process

Engineering Drawing In Design Process

Problem identification& exploration of ideas

Visualize

Sketches

Geometric model

Detail drawings&

3D model

Draw , design and record initial ideas

Created from sketchesused or analysis

Refine, optimize & record the precise data for production

process or implementation

Visualization is the ability to mentally

picture things that do not exist

Communication the design solution

should be communicated to others without

ambiguity

Documentation permanent record of the

solution

Problem Definition

Exploration of Ideas

Design

Analysis

Refinement and Optimization

Implementation

Visualize

Sketches

Geometric model

Detail drawings& 3D model

Engineering Drawing In Design Process

Design

Analysis

Refinement and Optimization

Implementation

Visualize

Sketches

Geometric model

Detail drawings& 3D model

Engineering Drawing In Design Process

Problem Definition

Exploration of Ideas

Analysis

Refinement and Optimization

Implementation

Visualize

Sketches

Geometric model

Detail drawings& 3D model

Engineering Drawing In Design Process

Problem Definition

Exploration of Ideas

Design

Refinement and Optimization

Implementation

Visualize

Sketches

Geometric model

Detail drawings& 3D model

Engineering Drawing In Design Process

Problem Definition

Exploration of Ideas

Design

Analysis

Visualize

Sketches

Geometric model

Detail drawings& 3D model

Engineering Drawing In Design Process

Problem Definition

Exploration of Ideas

Design

Refinement and Optimization

Analysis

Implementation

Visualize

Sketches

Geometric model

Detail drawings& 3D model

Engineering Drawing In Design Process

Problem Definition

Exploration of Ideas

Design

Implementation

Analysis

Refinement and Optimization

Engineering Drawing

Standards

Standards Definition

Drawing standards are set of rulesset of rules that govern how

technical drawings are represented.

Drawing standards are used so that drawings conveyconvey

the same meaningthe same meaning to everyone who reads them.

Why Necessary

ISO International Standards Organization

Standard Code

ANSI American National Standard InstituteUSA

JIS Japanese Industrial StandardJapan

BS British StandardUK

AS Australian StandardAustralia

Deutsches Institut für NormungDINGermany

Country Code Full name

Engineering Drawing

Drawing Sheet

Drawing Sheet : Standard size

Trimmed paper of

a size A0 ~ A4.

Standard sheet size

(JIS)

A4 210 x 297

A3 297 x 420

A2 420 x 594

A1 594 x 841

A0 841 x 1189

A4

A3

A2

A1

A0(Dimensions in millimeters)

Drawing space

Title block

dBorder lines

Drawing Sheet : Orientation & Margin

A3 297 x 420

Engineering Drawing

Drawing Scale

Drawing Scales : Definition

Drawing Actual

Length, size

:

ScaleScale is a ratio between the linear dimension of a

drawn representation of an object and the actual object.

1 2

20

10

Designation of a scale consists of the word “SCALE”

followed by the indication of its ratio, as follows

SCALE 1:1 for full size

SCALE X:1 (X > 1) for an enlargementenlargement scales

SCALE 1:X (X > 1) for a reductionreduction scales

Drawing Scales : Designation

Drawing scale is commonly found in a title block.

Standard reducing scales are

1:2, 1:5, 1:10, 1:20, 1:50, 1:100

Drawing Scales : Standard scale

Standard enlarging scales are

2:1, 5:1, 10:1, 20:1, 50:1, 100:1

Engineering Drawing

Lettering

- Size (or text height)

- line thickness

- Shape

- Space between letters

- Space between words

Recommendation

LegibilityLegibility

UniformityUniformity

Text’s style on the drawing

must have the following

2 properties

Examples

GOOD

Not uniform in style.

Not uniform in height.

Not uniformly vertical.

Not uniform inthickness of stroke.

Inappropriate spacebetween letters

Style (this course)

Gothic vertical style.

Begin the sentence, phrase or word with a capital letter.

Text height 2~3 mm.

Space between lines of text is about of text height.

Height of the lower-case letter is about 2/3 of that of a

capital letter.

Basic Strokes

Straight Slanted CurvedHorizontal

1 1 2

3

“I” letter “A” letter

1

2

3

4 5

6

“B” letter

Examples

Leave the space between words equal to the spacerequires for writing a letter “O”.

Example

Sentence Composition

ALL DIMENSIONS ARE INMILLIMETERS

O O OOUNLESS

OTHERWISE SPECIFIED.O

Engineering Drawing

Line Types

Basic Line Types &Application

Continuous

DashChain

Style

Thickness Thick Thin 1. Dimension line2. Extension line3. Leader line

Center line

Hidden line

Visible line

represent features that can be seen in the current view.

represent features that can not be seen in the current view.

represents symmetry, path of motion, centers of circles,

axis of axisymmetrical parts

indicate the sizes and location of features.

1. Visible line

3. Hidden line

4. Center line

2. Dimension line

Extension line

Leader line

Basic Line Types An Example

Basic Line Types