team fuzzy balls presents: the ball stinger waqas abbasi dusty ashberry daniel grant chadwick harris...
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Team Fuzzy Balls presents: The Ball Stinger
Waqas Abbasi
Dusty Ashberry
Daniel Grant
Chadwick Harris
Gene Karshenboym
Robert Ricaud
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Overview Problem Statement Product Description and Functional Requirements Conceptual Designs Selection Analysis Engineering Analysis Prototype: Stage 1
Design Problems Modified Prototype
Video Demonstration Completed Design Cost Analysis
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Problem Statement
When a can of pressurized tennis balls is opened they begin to loose pressure after approximately 3 hrs of play
Through non-pressurized storage the tennis balls will continue to loose internal pressure
This loss of pressure greatly affects the performance of the tennis balls.
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Problem Statement Cont.
Tennis coaches and avid players use a high volume of tennis balls on a daily basis.
The cost to replace the balls due to pressure loss is a financial burden.
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Product Description and Functional Requirements
A pressurized storage system used to maintain/replenish tennis balls to increase longevity and performance.
Functional requirements/desires1. SAFETY
2. Hold a pressure of 14 psi
3. Maximize capacity (minimum 150)
4. Easy to use
5. Does not hinder regular routine of user
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Conceptual Designs
Sliding Lid, Buckle Top, and Cylinder
Sliding LidBuckle Top
Cylinder
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Comparative Baseline
Ball Charger
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Selection Analysis
Criteria Weights
Capacity Size Ease Safety Portability Dummy Total
Capacity - 1 0 0 0 1 2
Size 0 - 0 0 0 1 1
Ease 1 1 - 0 0 1 3
Safety 1 1 1 - 1 1 5
Portability 1 1 1 0 - 1 4
Dummy 0 0 0 0 0 - -
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Selection Analysis (Cont.)
Design Analysis
Size Capacity Ease Portability Safety Raw Norm.
Sliding Lid
4 5 2 5 5 65 1.00
Buckle Top
4 5 5 5 3 64 0.98
Cylinder 2 2 3 3 5 52 0.80
Ball Charger
4 3 3 5 4 59 0.91
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Engineering Analysis
EI
qL
384
4
in 125.17L
in
lb75.239in 125.17
in
lb14 2 bPq
433
in43.112
in1in125.17
12
bhI
2in
lb 2.030,116E
in324.0384
4
EI
qL
Deflection of Lid w/ Corner Supports:
in02.0384
4
EI
qL
Deflection of Lid w/ 8 Supports:
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Engineering Analysis (Cont’d)Buckles: Total tensile strength must be greater than 600 lb.
for
• N = 2
• d= 1/8 in = .125 in
• F = 600 lbf
2y psi89004
4
125.
lbf 600 S
Area
Force
Therefore, the yield strength of the material must be approx. 48.9 kpsi. Most low alloy steels have yield strengths greater than 50 kpsi.
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FEA data
Polyethylene
Max deflection: 93 inches
ABS Plastic
Max deflection: 1 inch
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Prototype: Stage 1
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Part Drawings: Container
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Prototype Lid
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Part Drawings: Lid
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Part Drawing: Gasket
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Wiring Schematics
AC Power
Pressure Switch
≥15 psi
<15 psiCompressor
Common Switch
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Design Problems
Container Experienced Bulging Due to an inadequate container thickness and
non-ideal box material Buckles would fail due to lid bending Replaced Air Compressor
Air Compressor was inadequate because of 2-stroke design which could allow air to leak from container
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Solution to Design Problems
Straps were placed to redistribute the forces that caused bulging
Replace buckles with clamps An airbrush compressor replaced original tire
compressor
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Modified Prototype Design
Movie Page
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Final Design Criteria
Container thickness changed to 3/8” ABS polycarbonate plastic
4 buckle latches will be used to secure the lid
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Cost Analysis
Prototype Box: $78.00 Lid: $128.00 Pump: $45.00 Fittings: $40.00 Sealant: $5.00 Handles/Latches: $30.00 Total: $326.00
Design Box: $100.00 Lid: $40.00 Pump: $10.00 Fittings: $15.00 Sealant: $1.00 Handles/Latches: $10.00 Total: $186.00
These prices reflect mass unit production.
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Website
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Questions