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