Team Gun Show

Final PresentationDecember 1, 2004

Group Members:

Nate GriggsClay Hamlin

Marc ManningJon Megahy

Van VoJoel Williamson

Project Overview

Problem Concept & Objectives Existing Product & Limitations Problem Statement & Constraints Design Partition Pair-wise Comparison Conceptual Design Prototype Review Conclusion Future Concepts

Problem Statement & Objectives

Our Customer is a Sporting Event Promoter

Repeatable Firing Mechanism for T-Shirt Gun to be used for promotional events

Customer Needs Ability to fire at least 5 T-shirts before reloading More rapid loading/firing of T-shirts Less operation labor

Existing Product

Limitations:

Length of Loading Time

Labor Intensive Loading

Existing Product

Limitations:

Only Capable of Single Shot Operation

Design Specifications & Constraints

Safety Precautions allow for only design of the repeating modifications, not the firing assembly

Specifications/Constraints Should attach to existing device Less than 4 feet in length Total weight should less than 35 lbs Operable by one person Rubber seals to handle pressure Cost effective

Design Partition

4 Main Sub-Systems Barrel

Provides the means for directing t-shirt in a desired direction at high velocity

Would most likely be a tube of some sort. Barrel housing / Slide

Forms the “body” of the assembly Responsible for holding all of the other subsystems

together Facilitates necessary movement of parts in the

assembly

Design Partition (continued)

4 Main Sub-Systems (cont.) 5 Shot Queue

Will allow for at least 5 t-shirts to be stored and subsequently fired in rapid succession

Gun Rear Will contain the rear seal for the firing chamber along

with the firing mechanism. Firing Mechanism will NOT be improved upon

(commercially available); taken as a given

Pair-wise ComparisonWeighting Criteria

X= 1.14Criteria Category A B C D E F G H I J K L M N Weights

Safety A -- A A A A A A A A A A A A A 13 A's 14.77Marketability B -- -- B D E B G H B J K B B B 6 B's 6.82Affordability C -- -- -- D E C G H C J K C C C 5 C's 5.68

Weight D -- -- -- -- D D D H D D D D D D 11 D's 12.50Length E -- -- -- -- -- E E H E J E E E E 9 E's 10.23

Durability F -- -- -- -- -- -- G H F J K L M F 2 F's 2.27Loading Ease G -- -- -- -- -- -- -- H G J K L M G 2 G's 2.27

Repeatable Firing H -- -- -- -- -- -- -- -- H H H H H H 12 H's 13.64Aesthetics I -- -- -- -- -- -- -- -- -- J K L M I 1 I 1.14

Sealing Quality J -- -- -- -- -- -- -- -- -- -- J J J J 10 J's 11.36Operation Ease K -- -- -- -- -- -- -- -- -- -- -- K K K 8 K's 9.09

Fabrication Ease L -- -- -- -- -- -- -- -- -- -- -- -- L L 5 L's 5.68Maintainability M -- -- -- -- -- -- -- -- -- -- -- -- -- M 4 M's 4.55

Dummy N -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0 Dummy 0.00

Selection Analysis Pair-wise Comparison

Baseline

Criteria WeightsMax

ScoreGatling

GunChain-Feed

Double-Barrel

ShotgunMagazine

Loaing Revolver

Existing T-shirt Gun

Safety 14.77 10 7 6 8 7 8 10Marketability 6.82 10 7 6 7 7 7 8Affordability 5.68 10 5 6 7 7 7 5

Weight 12.50 10 3 4 7 9 7 7Length 10.23 10 3 7 7 7 8 7

Durability 2.27 10 5 5 7 6 5 7Loading Ease 2.27 10 5 7 2 10 10 3

Repeatable Firing 13.64 10 9 10 4 10 10 1Aesthetic Potential 1.14 10 9 9 7 7 9 7

Sealing Quality 11.36 10 4 8 9 4 8 10Operation Ease 9.09 10 3 4 7 8 8 8

Fabrication Ease 5.68 10 3 6 6 3 3 8Maintainability 4.55 10 7 8 6 7 7 9

Scores 100.00 1000 525.00 656.82 675.00 722.73 768.18 706.82Normalized Scores 1.00 0.53 0.66 0.68 0.72 0.77 0.71

Concepts

Conceptual Design Open/Loading Position

Barrel

Coupling

GripS-Slide

Revolver Housing

Firing Chamber

Existing

Trigger

Mechanism

Isometric View of Open Position Revolver

Gasket

Conceptual Design Closed/Firing Position

Barrel

Coupling

GripS-Slide (sheathed by Grip)

Isometric View of Firing Position Revolver

Revolver Housing

Firing Chamber

Existing

Trigger

Mechanism

Conceptual Design Indexing Assembly

Spring

Ratchet

Firing

Chamber

Conceptual Design S-Slide

Isometric View of S-SlideTop View of S-Slide

Open

Locked and Ready to Fire

Conceptual Design Pumping Assembly

s-slide

grip

Conceptual Design Animation

Prototype Open/Loading Position

Barrel

Coupling

Grip

S-Slide

Revolver Housing

Firing Chamber

Existing

Trigger

Mechanism

PrototypeClosed/Firing Position

Barrel

Coupling

Grip

S-Slide (sheathed by Grip)

Revolver Housing

Firing Chamber

Existing

Trigger

Mechanism

PrototypeIndexing Assembly

PrototypeS-Slide

Conceptual Design Pumping Assembly

PrototypeVideo

Conclusions

Design vs. Prototype: Major problem with

prototype is substitution of welds

Prototype uses many material substitutions

Repeatable Firing Mechanism for T-Shirt Gun to be used for promotional events

Project Constraints: Safety Repeatable Firing Sealing Operation Ease

Revolver Design is Best Solution for Criteria

Future Concepts Attach a Firing Mechanism

Test SealsTest Launching DistanceTest Operation Ease

Pneumatic Indexing System

Aesthetic Improvements

Make Design more Robust for Mass Production/Easier Manufacturability

Questions/Suggestions?