Reverse Engineering - Engineering Design and Graphics - Lecture Slides, Slides of Computer-Aided Design for Engineers

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Reverse Engineering:

An Introduction

What is Reverse Engineering?

A systematic methodology for

analyzing the design of an existing

device or system, either as an

approach to study the design or as a

prerequisite for re-design.

Levels of Analysis in

Reverse Engineering

1. System-Wide Analysis

2. Subsystem Dissection Analysis

3. Individual Component Analysis

System-Wide Analysis

• Customer Requirements
• Engineering Requirements
• Functional Specifications
• Prediction of Subsystems and Components

Individual Component Analysis

• Repeat Dissection Steps to Individual

Component

• Define Component Material Selection and

Fabrication Process

• Suggest Alternative Designs, Systems,

Components, and Materials

Example: Small Kitchen Scale

• The Kitchen Scale is a useful device to measure out small amounts of food that are to be prepared. There are many people who need to be careful of the quantity of food that they take in. Diabetics must be careful of the amount of certain foods that they eat in order to maintain a proper sugar level. People on weight loss diets must also be careful with the number of calories that they consume at every meal. The Kitchen Scale is a device that can help control the amount of food consumed by an individual.

Engineer’s Perspective:

The engineer has a totally different perspective from which he operates. The engineer will be looking at things like the material that the object is made of, the mechanisms that are required, the strength of the materials used, etc.

In relation to the kitchen scale:

• Is the riveting process of the plate to the stem adequate?
• Are the materials used strong enough to hold one pound of weight?
• Does the kitchen scale have any sharp edges that could cause injury?
• What mechanism is necessary to give an accurate reading on the scale?

Functional Requirements

• The kitchen scale must be able to accommodate 1 pound of

food.

• The plate must be large enough to hold 1 pound of food.
• The stem must be strong enough to support the plate and the

food.

• The linkage must be designed so that the reading is accurate

to the nearest .25 ounce.

• The read-out must be easily read.
• The design must lend itself for easy cleaning and sanitizing.

FISHBONE DIAGRAM FOR MECHANICAL DISSECTION

(Example: Small Kitchen Scale)

Kitchen Scale

PLATFORM

TOP PLATE

STEM RIVETS

FOUR-BAR MECHANISM & HOUSING (Example: Small Kitchen Scale)

LINK 2 LINK 3

LINK 1

COVER

BOTTOM

READOUT

ME

Team Project Proposal

“Reverse Engineering of a Small Toy,

Hand Tool, or Home Appliance”

• Cover Page
• General Description
• Graphic Picture

Due February 25, 2008, In-Class

Bathroom Scale

Beer Faucet

Bicycle Pump

Bolt Cutter

Can Opener

Corkscrew

Deadbolt Lock

Desktop Clamp

Differential Gear

Doorknob Assembly

Fuel Pump

Gate Valve

Hand Tool

Hose Nozzle Master Cylinder Model Car Drive Train Oil Pump Oscillating Sprinkler Pencil sharpener Pepper Grinder Pipe Clamp Ratchet Tie-Down Shower Massage Head Sprinkler Head Stapler Vise Grip Water Faucet Valve

ME302: Example Reverse Engineering Items