Graphics_1 - INTRODUCTION I. Roles of Engineers A. Create...

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Unformatted text preview: INTRODUCTION I. Roles of Engineers A. Create idea sketches B. Calculates strcsScs C. Analyze motions D. Size the parts E. Specify materials and production methods F. Supervise preparation of drawings and specifications II. Communication A. Must be able to communicate ideas to associates and support staff B. Obtain skill in freehand sketching C. Obtain ability to work with computer-controlled drawing techniques D. Become proficient in drafting, designing, and conceptualizing III. The Graphic Language A. Earliest forms of writing were picture forms B. Drawing is a graphic representation of a real thing C. Drawings have many forms D. Graphic representation of representation is a basic natural form of communication IV. Types of Drawings A. Artistic 1. Aesthetic qualities 2. Philosophic ideas 3. Abstract ideas B. Technical 1. Represent design of objects 2. Indicate method in which to construct an object 3- Earliest known technical drawings-4000 B-C. V. Earl}r Descriptive Geometry A. Origins: problems were encountered in designs for building military fortifications in 18th century B. Gaspard Monge--"inventor" of descriptive geometry 1. Developed the principles of projection--basis of technical drawing 2. Principles of descriptive geometry were a military secret for 15 years in France. 3. Principles of descriptive geometry were eventually used to combat manufacturing problems a. manufacture of interchangeable parts VI. Modern Technical Drawing A. Introduction of blueprint process-- 18% at Philadelphia Centennial Exposition B. Blue prints replaced copper-plate engraving C. Pre 1900 drawings were first angle projection 1. Top View placed under the front View 2. Left side View placed at right of the front View D. Third angle projection 1. Views are arranged in more logical position 2. Standard in United States E. Drafting Standards 1. American National Standard Drafting Manual--Y14 VII. Definitions A. Descriptive geometry-projection of three-dimensional figures on the two-dimensional plane of paper 1. geometric manipulations--deter1nine length, angles, shapes B. Mechanical drawing--applies to a drawing made with drawing instruments C. Computer graphics--application of conventional computer techniques 1. CAD (computer aided designy-produce technical drawing 2. Finite Element Analysis-stress problems, thermal problems D. Technical drawing-any drawing used to express technical ideas E. Engineering graphics-part of a technical drawing that is concerned with the graphical representation of designs F. Technical sketching-freehand expression of graphic language 1- Mechanical drawing is the instrumental expression of graphic language (3. Blueprint readingwsinterpretation of all ideas expressed on technical drawings VIII. Projections A. Behind every drawing of an object is a space relationship 1. Station point--observer’s eye 2. The object 3. Plane of planes of projection 4. Projectors-also called visual rays lines of sight B. Perspective-when projectors form a I'cone" 1. Observer is relatively close C. Projection--projectors are parallel 1. Observer is infinitely distant 2. Orthographic projectionuprojectors are parallel and perpendicular to the plane of projection 3. Oblique projection--projectors are parallel but oblique to the plane of projection. q- - . -. . ----— '45. 21$}?!qu - rm. . PICTUHEFLAHEDH _ -.~,_..:;.;1- m7- PLANE OF FRELIECTIDN " ' -:v - STATION POINT {a} PERSPECTIin PICTURE PLANE DH PLANE 0F PROJECTION “3} PARALLEL PHDJECTIDN ...
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This note was uploaded on 10/12/2009 for the course ENFD enfd 251 taught by Professor Thomashuston during the Spring '08 term at University of Cincinnati.

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Graphics_1 - INTRODUCTION I. Roles of Engineers A. Create...

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