ENS 207 engineering graphics Lecture 1: Introduction to engineering graphics

Information Lecturer: Kemal Turan Book Schedule Tuesday 14:00 to 16:50 (Computer Lab F1.18) Office : F1. 12 Email: kturan@ius.edu.ba Engineering graphics with AutoCAD 2008 James D. Bethune PEARSON Additional material will be provided if necessary.

Assessment 25% Quizzes (4) Mid-term exam (2) 15 % Assignments/HW 35%   Mid-term exam (2) Assignments/HW 15 % Final Exam 35%

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.

Effectiveness of Graphics Language 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. can you easily understand that …?

Basic Knowledge for Drafting Graphics language Word language Line types Geometric construction Projection method Lettering

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.

Standard Code ANSI American National Standard Institute USA Deutsches Institut für Normung DIN Germany ISO International Standards Organization

Composition of Graphic Language Graphic language in “engineering application” use lines to represent the surfaces, edges and contours of objects. The language is known as “drawing” or “drafting” . A drawing can be done using freehand, instruments or computer .

Freehand drawing Example The lines are sketched without using instruments other than pencils and erasers. Example

Instrument drawing Example Instruments are used to draw straight lines, circles, and curves concisely and accurately. Thus, the drawings are usually made to scale. Example

Computer drawing Example 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. Hard The hard leads in this group (left) are used where extreme accuracy is required, as on graphical computations and charts and diagrams. The softer leads in this group (right) are sometimes used for line work on engineering drawings, but their use is limited because the lines are apt to be too light. Medium These grades are for general-purpose work in technical drawing. The softer grades (right) are used for technical sketching, lettering, arrowheads, and other freehand work on mechanical drawings. The harder leads (left) are used for line work on machine drawings and architectural drawings. The H and 2H leads are widely used on pencil tracings for reproduction. Soft These leads are too soft to be useful in mechanical drafting. They tend to produce smudged, rough lines that are hard to erase, and the lead must be sharpened continually. These grades are used for artwork of various kinds, and for full-size details in architectural drawing.

Style of Pencil You 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.