Scrub-RayBy: Cole, Kevin, Alex, Karol, Roland

Roland

Washing Dishes is a Pain!• For those without dishwasher access (especially college students)• Alternative to elbow grease/expensive machines• Effective, compact, and affordable

2Roland

RecapCompetitors:

Initial Design:

3Roland

Design Characteristics1.Wanted the product to be comfortably operated with one hand (4 in.

diameter, 2 in. depth)2.Maximize the efficiency of the water powered turbine

a.Includes the angle of entrance for waterb.Minimizing frictionc.Correct disposal of water from chamberd.Turbine Shapee.Gear system

3.Easy disassembly for interchangeable gears/turbines (DoE)

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Old vs. New

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Demo Movie

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Issues1. 3-D printing tolerances2. Friction3. Gearing

•Ratios•Planetary system

4. Creating a pressure differential5. Tolerance stack-up and alignment6. Adhesives/fasteners7. Water Release System

7Alex

Successes1.Use of planetary gear system

a.Solved the insufficient torque issue2.Acrylic as the material

a.Excellent tolerancesb.Far lower friction

3.Sufficient amount of budget lefta.$88/$200 (44%)

4.Product’s rotational piece spins efficiently and powerfully

8Alex

Manufacturing Method• Our Purposes (Prototype)

• Layered laser cut acrylic and plastic bonder• Through-holes for bolt fasteners (disassembly)

• Mass Produced• Injection molded with plastic bonder• Not made for disassembly

9Karol

MaterialAcrylic

• Pros:• Low friction• Great tolerances• Precision cutting• High machinability

• Cons:• Must create 2-D parts and layer to make 3-D• Poor wear resistance• Easily chips

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Prototype vs. Ideal

11Kevin

CAD Drawings

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DFA (Prototype)

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DFA (Ideal)

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aPriori Cost Analysis

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DOEMeasured Revolutions Per Minute

• Tied string to shaft

Variables • Turbine Shape (x1) • Water Power (x2) • Gears (x3)

Characteristic Equation • RPM = 119 + 39.92x2 + 45.42x3 + 13.33x2x3 • Max = 218 RPM

17Karol

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Gantt Chart

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Budget

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Wrap-Up• Despite multiple obstacles, we managed

to turn a common kitchen faucet into a dish cleaning machine!

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“The race is not always to the swift, but those who keep on running”