Engineering Design & Drawings

Engineering Design is Structured Problem Solving

• Various problem solving frameworks:– Commonality?

Define the problem

Develop alternative designs & select the most promising

Build a prototype

Test & redesign as necessary

Document & release the design

Drawings: The Universal Language

• Engineers make drawings to understand and communicate ideas

• Drawings are used throughout the entire engineering design process. – Freehand sketching is used for generating ideas and for

communicating them– Computer-aided design (CAD) is used to for both design

documentation and to evaluate design alternatives.• Engineering design still retains its artistic roots– Design requires both analysis and synthesis

Drawing Conventions: Rules of the Language

• Line techniques and lettering• Planar Projections– Axonometric– Multiview drawings– Auxiliary and sectional view

• Dimensioning and tolerancing• Examples

Planar Projections

Free-Hand sketches---let’s have some fun• Tools• A freehand sketch begins with proportionally

laid out construction lines– Drawn thin & lightly– Guide the drawing

• Object lines are thicker, dark and uniform

Drawing Lines: Techniques

Proportions• Approximating proportions

• Foreshortening