Engineering Drawing An Introduction

Engineering Drawing Importance

Graphic Language & Effectiveness Try writing the description of these pictures……………

Graphic Language & Effectiveness ………………..………Or these pictures And let someone attempt to make a sketch or visualize from your description.

Graphic Language & Effectiveness It can be found that … The word language is inadequate for describing the size, shape and features completely as well as concisely.

Engineering Drawing Process

Engineering Drawing In Design Process Visualization is the ability to mentally picture things that do not exist Problem identification & exploration of ideas Visualize Draw , design and record initial ideas Sketches Communication the design solution should be communicated to others without ambiguity Created from sketches used or analysis Geometric model Refine, optimize & record the precise data for production process or implementation Detail drawings & 3D model Documentation permanent record of the solution

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Design Geometric model Analysis Refinement and Optimization Detail drawings & 3D model Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Design Geometric model Analysis Refinement and Optimization Detail drawings & 3D model Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Design Geometric model Analysis Refinement and Optimization Detail drawings & 3D model Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Design Geometric model Analysis Refinement and Optimization Detail drawings & 3D model Implementation

Engineering Drawing In Design Process Refinement and Optimization Problem Definition Visualize Exploration of Ideas Sketches Design Geometric model Analysis Refinement and Optimization Detail drawings & 3D model Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Design Geometric model Analysis Refinement and Optimization Detail drawings & 3D model Implementation

Engineering Drawing Standards

Standards Definition Why Necessary Drawing standards are set of rules that govern how technical drawings are represented. Why Necessary Drawing standards are used so that drawings convey the same meaning to everyone who reads them.

Standard Code Country Code Full name ANSI American National Standard Institute USA JIS Japanese Industrial Standard Japan BS British Standard UK AS Australian Standard Australia Deutsches Institut für Normung DIN Germany ISO International Standards Organization

Engineering Drawing Drawing Sheet

Drawing Sheet : Standard size Trimmed paper of a size A0 ~ A4. A4 A3 Standard sheet size (JIS) A4 210 x 297 A3 297 x 420 A2 420 x 594 A1 594 x 841 A0 841 x 1189 A2 A1 A0 (Dimensions in millimeters)

Drawing Sheet : Orientation & Margin Border lines A3 297 x 420 Drawing space Title block

Engineering Drawing Drawing Scale

Drawing Scales : Definition Length, size Scale is a ratio between the linear dimension of a drawn representation of an object and the actual object. : 1 2 10 20 Drawing Actual

Drawing Scales : Designation 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 enlargement scales SCALE 1:X (X > 1) for a reduction scales Drawing scale is commonly found in a title block.

Drawing Scales : Standard scale Standard reducing scales are 1:2, 1:5, 1:10, 1:20, 1:50, 1:100 Standard enlarging scales are 2:1, 5:1, 10:1, 20:1, 50:1, 100:1

Engineering Drawing Lettering

Recommendation Text’s style on the drawing Examples must have the following 2 properties Examples GOOD Not uniform in style. Legibility - Shape Space between letters Space between words Not uniform in height. Not uniformly vertical. Uniformity Not uniform in thickness of stroke. - Size (or text height) - line thickness Inappropriate space between 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 Horizontal Curved Examples “I” letter “A” letter “B” letter 4 5 1 1 1 2 6 3 3 2

Sentence Composition ALL O DIMENSIONS O ARE O IN MILLIMETERS O UNLESS Leave the space between words equal to the space requires for writing a letter “O”. Example ALL O DIMENSIONS O ARE O IN MILLIMETERS O UNLESS OTHERWISE O SPECIFIED.

Engineering Drawing Line Types

Basic Line Types &Application Thickness 1. Dimension line 2. Extension line 3. Leader line Thick Thin Visible line Style Continuous Hidden line Dash Chain Center line 1. Visible line represent features that can be seen in the current view. 2. Dimension line Extension line Leader line indicate the sizes and location of features. 3. Hidden line represent features that can not be seen in the current view. 4. Center line represents symmetry, path of motion, centers of circles, axis of axisymmetrical parts

Basic Line Types An Example

Basic Line Types