1.Pass in your Technical Drawing Lab and your final Paper Mousetrap (someone else’s that you constructed). 2.If you are missing either assignment (or both), pass in a piece of paper with your name and missing assignment title on it. “Give me a lever long enough and I shall move the world.” Archimedes Unit 3: Engineering Design

Isometric Section Standard View Development Perspective Oblique Cut-away Pictorial Communication Technology A B C D EF G E B C F G D A [REVIEW]

Which of the following images are parallel projections? TECHNICAL GRAPHICS Technical Graphic Communication [REVIEW]

–Print Graphic Communication Visual, lingual messages that include printed media –Photographic Communication Using photographs, slides, or motion pictures to communicate a message –Telecommunications Communicating over a distance –Technical Graphic Communication Specific information about a product or its parts Classes of Communication Technology [REVIEW]

–Major Processes: Relief –A modeled work that is raised (or lowered) from a flat background. –Cuneiform by the Sumerians ~6000 years ago. –Wood block printing ~200 C.E. –Movable type printing ~1040 C.E. (Gutenberg ~1450) –Intaglio (in-tal-yo) ~1430 –Rotary printing press ~1843 Lithography (offset printing) ~1796 –The source and destination are not on raised surfaces –Grease and water do not readily mix –A chemical process –Most modern books and newspapers Print Graphic Communication Intaglio (in-tal-yo) 1. Depressions cut into printing plate 2. The plate is covered in ink3. Excess ink is removed from surface 4. Paper placed on plate and compressed 5. Paper is removed and ink has been transferred Low Relief High Relief Communication Technology Cuneiform [REVIEW]

Telecommunication –Communicating over a distance Tele – Greek, “far off” Communicare – Latin, “to share” –Rely on the principles of electricity and magnetism –2 types: Hardwired systems (telephone, cable, fiber-optic) Broadcast systems (radio and t.v., mobile phones) –Point-to-point: One transmitter and one receiver –Broadcast: One powerful transmitter to numerous receivers Telecommunications Communication Technology [REVIEW]

–Smoke signals and drums –Chains of beacons (Middle Ages) Navigation signals Enemy troops approaching –Homing pigeons Carrier pigeons used as early as 1150 in Baghdad Olympic victors, Greece; Stock options, Europe –Optical telegraph (semaphore, 1792, France) Towers with pivoting shutters Information encoded by the position of the mechanical elements Telecommunications Communication Technology [REVIEW]

No drawing tools SKETCHES Technical Graphic Communication [REVIEW]

Standard Views Sectional Views Auxiliary Views Developments Working Drawings MULTI-VIEW DRAWINGS Technical Graphic Communication [REVIEW]

Show a likeness of an object as viewed by the eye Isometric Perspective Oblique Exploded Assembly Cutaway Pictorial Technical Graphic Communication PICTORIAL DRAWINGS [REVIEW]

Essential Elements of Engineering 1.Thorough understanding of scientific principles Mechanics, Electricity and Magnetism, Thermodynamics, etc. 2.Practical and useful designs Based on design requirements KISS – Keep It Short and Simple 3.Good communication skills Great design is worthless if not effectively communicated ORALWRITTEN DRAWINGS [REVIEW]

Engineering Communication [REVIEW]

TEST FRIDAY Including multiple choice, isometric and orthographic drawing, and 2 algebra problems UNIT 2: Engineering Communication

Topics Covered 1. Force, Energy, Work, Power, and Efficiency 2. Topics in Mechanical Engineering 3. Topics in Electrical Engineering 4. Engineering Design Process 5. Teams and Projects 6. PROJECT: Mechanically Controlled Electromagnetic Crane Unit 3: Engineering Design

1. A push, pull, twist (or bend) 2. A vector quantity 1. Magnitude 2. Direction 3. Thrust – increases velocity 4. Drag – decreases velocity 5. Torque – changes rotational speed Units: Newton (N), Pound-force (lbf) FORCE

1. Inertia “Objects continue to move in a state of constant velocity unless acted upon by an external net force.” 2. F net = ma “An unbalanced force acting on an object will result in the object’s momentum changing over time.” 3. Reciprocal Actions “Forces always occur in action/reaction pairs.” Newton’s Laws of Motion

1. Energy 1. A scalar quantity 2. The amount of work that is (or can be) performed by a force 2. Potential Energy 1. Energy stored within a physical system with the potential to be converted into other forms of energy (e.g., kinetic, thermal, sound, light) 2. Types: Gravitational, Elastic, Chemical, Electrical, Nuclear 3. Kinetic Energy The energy an object possesses due to its motion “Energy can be transformed, but cannot be created or destroyed.” ENERGY

1. Work 1. “The amount of energy transferred to a system by a force acting through a distance.” 2. The change in kinetic energy of a system 2. W = F x d 1. The work done on an object is the product of the component of the force in the direction of the displacement and the magnitude of the displacement. 2. A force does no work if the object doesn’t move Units: Joule (J), Newton-meter (Nm), Foot-pound (ft-lb) WORK

1. Power 1. “The rate at which work is performed or energy is converted.” 2. The rate of change of work or energy. 2. P = W / t Units: Watt (W), Foot-pound per second (ft-lb/s), Horse power (hp) POWER (Mechanical)

1. Efficiency 1. The ratio of the energy delivered by a system to the energy supplied to it. 2. The ratio between the output of a system and the input When is efficiency 100%? 2.Never – 2 nd Law of Thermodynamics 3.Some of the input energy is converted to heat, sound, light, etc. Units: Dimensionless or %, Situational EFFICIENCY EFFICIENCY = x 100% OUTPUT INPUT

1. Equations 1. W = F x d 2. P = W / t 3. F = m x a 4. Eff = (output / input) x 100% 2. Problem Solving Process 1. Write Given, Assign Variables, Sketch and Label Diagram 2. Write Formulas / Equations 3. Substitute and Solve 4. Check Answer, THEN Box Answer Engineering Problems

1. Use dimensional reasoning (and the power-law expression) to determine expressions for the terms on the left side of the equations: 1. W = f(F, d) 2. P = f(F, d, t) 3. F = f(m, a) 4. Eff = f(output, input) 2. Complete front side of worksheet by Wednesday’s class Homework