ENS 207 ENGINEERING GRAPHICS

Lecture 1: Introduction to engineering

graphics

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Information

Lecturer: Kemal Turan Schedule Tuesday 14:00 to 16:50

(Computer Lab F1.18) Office : F1. 12 Email: kturan@ius.edu.ba

Book

• Engineering graphics with AutoCAD 2008 James D. Bethune PEARSON Additional material will be

provided if necessary.

Assessment

Quizzes (4)

25%

Mid-term exam (2)

25%

Assignments/HW

15 %

Final Exam

35%

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Course Objectives

• Develop the ability to communicate with others through the language of technical drawing and sketching.

• Develop the ability to read and interpret engineering drawings created by others.

• use of international standards for drafting.

• Develop an understanding of 2D and 3D computer aided drafting.

1. Try to write a description of this object.

2. Test your written description by having someone attempt to make a sketch from your description.

Effectiveness of Graphics Language

can you easily understand that …?

Basic Knowledge for Drafting

Graphicslanguage

Wordlanguage

Linetypes

Geometricconstruction Lettering

Projectionmethod

Standards

Standards are set of rules that govern how technical

drawings are represented.

Drawing standards are used so that drawings transmit

the same meaning to everyone who reads them.

ISO International Standards Organization

Standard Code

ANSI American National Standard InstituteUSA

Deutsches Institut für NormungDINGermany

Graphic language in “engineering application” use

lines to represent the surfaces, edges and contours

of objects.

A drawing can be done using freehand, instruments or computer .

Composition of Graphic Language

The language is known as “drawing” or “drafting” .

Freehand drawing The lines are sketched without using instruments other

than pencils and erasers.

Example

Instrument drawing Instruments are used to draw straight lines, circles, and

curves concisely and accurately. Thus, the drawings are

usually made to scale.

Example

Computer drawing The drawings are usually made by commercial software

such as AutoCAD, solid works etc.

Example

DRAWING PENCILS

High-quality drawing pencils help produce good quality technical sketches and drawings.

HardThe hard leads in thisgroup (left) are usedwhere extremeaccuracy is required,as on graphicalcomputations andcharts and diagrams.The softer leads in thisgroup (right) aresometimes used forline work onengineering drawings,but their use is limitedbecause the lines areapt to be too light.

MediumThese grades are forgeneral-purpose work intechnical drawing. Thesofter grades (right) areused for technical sketching,lettering, arrowheads,and other freehand workon mechanical drawings.The harder leads (left) areused for line work onmachine drawings andarchitectural drawings. TheH and 2H leads are widelyused on pencil tracings forreproduction.

SoftThese leads are toosoft to be useful inmechanical drafting.They tend to producesmudged, rough linesthat are hard to erase,and the lead must besharpened continually.These grades are usedfor artwork of variouskinds, and for full-sizedetails in architecturaldrawing.

Style of PencilYou might be surprised how much your drawings benefit from finding a style of pencil that suits your use. Soft pencils, such as HB or F, are mainly used in freehand sketching.

Choose a pencil that:

• Is soft enough to produce clear black lines, but hard enough not to smudge (leke, mrlja) too easily. • Is not so soft that the point breaks easily.• Feels comfortable in your hand.• Grips the lead without slipping.

STANDARD SHEETS

* May also be used as a vertical sheet size at 11" tall by 8.5" wide.