Standout Technical Designers

MAE 416: ME Senior DesignSponsored by

Cooper Hand Tools

Group K4:

Nate OuelletteNathan Mize Justin BridgesBrian Sears Chris Evans Pooria Javidi

Outline• Problem Statement/Constraints• Design Options• Design selection• Design layout• Analysis• Fabrication• Testing Results• Recommendation• Concluding Remarks

Problem Statement

• Design a new tape blade with a minimum standout of at least 10ft while adhering to the defined problem constraints

• Constraints• Blade length: 25 ft• Width: 1.1 inches• Thickness: 0.0047 inches

Critical DesignFeatures

• Based on Combination of Ideas• Utilizes Original Lufkin Dimensions

– Requires Less Changes in Production

• Edges turned over– Double Thickness Flats

• Slots Cut Along Blade Length– First 2’ of Length– Diminishing Returns

• Coil Extendable Support– Coil wire attached to the blade

• comparison of our various cross sections.

Critical DesignSketches

Statistical ConsiderationFactors

• Test how material will perform– Test sample to yield- calculation.– Population mean= 95.24 ksi– Population variance=5.1816 ksi– Coefficient of variance= 0.0169

Probability density for Ultimate Tensile Strength of 1095 carbon steel. Cumulative probability

Optimization Methods

Criterion

Value Adj. (%)

Blade Grips

(score)

  Blade Support (score)

  Sym. Blade

(score)

  Cut-outs

(score)

  Heat Treat

(score)

 

Stiffness

0.25 2 0.5 0 0 3 0.75 -2 -0.5 3 0.8

Safety 0.25 0 0 -1 -0.25 -1 -0.3 -1 -0.3 3 0.8

Mfg. 0.2 -1 -0.2 -1 -0.2 -1 -0.2 2 0.4 3 0.6

Func. 0.15 2 0.3 2 0.3 2 0.3 2 0.3 3 0.5

Cost 0.5 -1 -0.5 -1 -0.5 -2 -1 2 1 -3 -1.5

Mkt. 0.5 1 0.5 1 0.5 1 0.5 2 1 2 1

Durability

0.5 -3 -1.5 -1 -0.5 -2 -1 -1 -0.5 1 0.5

Score Σ

100   -0.9

  -0.65

  -0.9   1.45   2.6

Design Matrix

EthicsEngineering Ethics are a set of standards which define engineers’ obligations to the

public, their clients, and the profession.

• Fundamental Canons– 1st Canon- Safety– 2nd Canon- Perform Services in Expertise– 3rd Canon- Avoid Conflicts of Interest

Concluding Remarks

• Focused on a Single Design• Continued Testing and Simulation• Remain on Schedule• Stay on Budget• Looking Ahead to Prototype Fabrication

Any Questions?