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Project 1.1.6

Drew Wellinghoff, Matt Sullivan, Tim Sullivan

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Table of Contents

1-3. Brainstorming

6. Decision Matrix

7. Final Design Solution

8. Video of the Final Project

9-11. Calculating Mechanical Advantage and Efficiency

12-13. Conclusion Questions

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Brainstorming - Potential Tasks

  • Lift and put a spherical object (aka a ball) in motion
  • Compress a button to activate a simple DC circuit
  • Unscrew the cap of a plastic water bottle
  • Use the conductive nature of a marble to complete a simple DC circuit

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Brainstorming Idea #1

This idea included the use of a wheel and axle, pulley, and an inclined plane.

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Brainstorming Idea #2

This idea included the use of a wheel and axle, compound gear train, and a sliding rack and pinion.

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Brainstorming Idea #3

This idea included the use of a lever, gear train, and an inclined plane.

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Decision Matrix

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Final Design Solution

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Video of Compound Machine

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Final Design Solution

  • 1st Mechanism - 2nd Class Lever

IMA = DE/DR

= (1in)/(0.2875in)

= 3.478

AMA = FR/FE

= (0.25lb)/(0.072lb)

= 3.472

Eff. = AMA/IMA * 100%

= 3.472/3.478*100

= 99.8%

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Final Design Solution

  • 2nd Mechanism - Simple Gear Train

GR = nout/nin

= 84/12

= 7:1

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Final Design Solution

  • 3rd Mechanism - 1st Class Lever

IMA = DE/DR

= (7.25in)/(5.25in)

= 1.38

AMA = FR/FE

= (0.015lb)/(0.014lb)

= 1.07

Eff. = AMA/IMA * 100%

= 1.07/1.38

= 77.5%

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Total Efficiency

TAMA/TIMA

TAMA = .052/.072

= .72

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TIMA = 3.478*1.38

= 4.8

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Teff = .72/4.8

= 15%

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Conclusion Questions

  1. The gear train was the easiest to calculate the drive ratio because it was simple math nout/nin.
  2. The mechanical advantage of the 1st class lever was the hardest to calculate because we had to deliberate over what type of lever it was, then figure out where the forces were applied.

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Conclusion Questions Cont.

  1. For an input force we would estimate 1/10th of a pound. For an output force, we would estimate 1/4th of a pound.
  2. We could have tried a belt driven system as opposed to a gear train. We could have also used a smoother surface for the marble to roll on, the one we have is bumpy.