Welcome to E GR 1206 EngineeringGraphics
Engineering Graphics Coordinator • Lee Reynolds • Office: ME 224A • Email: Howard.L.Reynolds@ttu.edu • Voice: 742-3538 Ext. 233 • Academic Website: http//www.reynolds.etec.ttu.edu or 22.214.171.124
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Graphic Language & Design CAD Systems Sketching Techniques Lettering Geometric Constructions Semester Topical Overview • Multiview Projection • Sectional Views • Auxiliary Views • Dimensioning • Tolerancing • Working Drawings
Lecture Overview • Engineering Graphics Language • The Design Process • Parallel & Perspective Projection • Lettering Practices • Homework
Course Title: E GR 1306Lesson Title: Design and Graphic Communication Objectives: After completing this unit, the student should be able to: • Define engineering graphics. • Explain why standards are important. • List the stages of the design process. • Name the three phases of concurrent engineering. • Explain the difference between parallel and perspective drawing. • Apply proper lettering technique.
Define concurrent engineering. • Explain the importance of computer-aided design, engineering, and manufacturing. • Explain the importance of prototypes and rapid prototyping
What is Graphic Communication? • a universal language • Standards organizations like ANSI (American National Standards Institute) and ISO (International Standards Organization) publish standards detailing how drawings should be created so they can be interpreted universally. • the primary medium for communicating and developing design concepts
The Engineering Design Process
Design Process Graphical Method 1. Identify the design problem. 1. Hand sketches to communicate and visualize the problem. 2. Problem Solving Concepts & Ideas. 2. Visualizea number of solution concepts by hand sketching. 3. Compromise Solutions 3. CAD models to communicatedetails for evaluation. • Models or Prototypes. • Production or working drawings 4. CAD model with working drawings to document the solution.
Engineering DesignUses Sketching & CAD • Ideas are initially sketched and then more accurate CAD drawings are created • A single accurate CAD database can be used to go from ideation to manufacturing and documentation. • Finite Element Analysis, 3D rendering, animation, documentation, rapid prototyping software are available for use with CAD.
Terminology • CAD: Computer Aided Design • CADD: Computer Aided Design & Drafting • CAM: Computer Aided Manufacturing • CIM: Computer Integrated Manufacturing • CAE: Computer Assisted Engineering • Reading Drawings: Interpreting drawings made by others • Technical Drawing: Drawings used to express technical ideas • Engineering Design Graphics: Technical Drawings • representing designs & specifications for physical objects
Freehand Sketching • Freehand sketching is used in engineering graphics to quickly communicate your ideas or designs. • A CAD program may not be available, especially during field work • Freehand sketching is not sloppy sketching! Your sketches need to be interpreted by others on your design team
Lettering Basics • Use HB or other medium grade pencil (2H) • Typical lettering height is 1/8” • Lettering is Vertical and UPPERCASE
Letter Shapes • You can think of each letter as being formed on a 6 x 6 grid. • Most letters are 5 units wide by 6 units tall. • T O M Q V A X and Y are all 6 units by 6 units. • Letter W is 8 units wide and 6 units tall • Letter I and numeral 1 are only the width of a single stroke.
Spacing Lettering • Space letters by eye so that the background areas appear equal, not so that the actual distance from one letter to the next is equal. • Space letters within words relatively close together. Space words relatively far apart. A good rule of thumb is to space words the width of capital “O” apart.
Remember!! • Neat legible lettering is used to add dimensions and notes to sketches. • Poor lettering can ruin an otherwise good sketch. • Engineering lettering is usually drawn with HB or other relatively soft lead. • Use vertical, uppercase single-stroke letters
Fundamental Axioms • Axiom 1: If a planar surface is parallel to a projection plane, then that planar surface will project true size onto the projection plane. • Axiom 2: Points transfer orthogonally into adjacent views.
Summary • Engineering drawing can be a universal language to communicate your ideas. • The engineering design process uses sketching and CAD to communicate and record ideas. • A single CAD database can be used to produce many types of drawings and models used throughout the design process.