cequent group “the development of a tie down ratchet group 2 stephen smith otto gerdeman adam...
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Cequent GroupCequent Group“The Development Of A Tie Down “The Development Of A Tie Down RatchetRatchet
Cequent GroupCequent Group“The Development Of A Tie Down “The Development Of A Tie Down RatchetRatchet
Group 2
Stephen Smith
Otto Gerdeman
Adam Schmitz
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The Team MembersThe Team MembersThe Team MembersThe Team Members
Steve Smith- Group Leader Ensures that all deadlines are met Keeps the team organized and focused
Adam Schmitz- Purchasing Agent Obtains and orders equipment & material Controls/upkeeps the budget
Otto Gerdeman- Technical Liaison Coordinates business with the University machine shop Controls drawings and maintains communication throughout the
manufacturing stages
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Project BackgroundProject BackgroundProject BackgroundProject Background Market is saturated with
tie-downs nearly identical in appearance and function
– Product differentiation is essential to our client
Our objective is to design and create features that provide this differentiation
– Quality/Price
– Functionality/Ease of Use
– Appearance/Packaging
Adam SchmitzAdam SchmitzAdam SchmitzAdam Schmitz
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Steps Taken to Identify SolutionSteps Taken to Identify SolutionSteps Taken to Identify SolutionSteps Taken to Identify Solution Re-examined the objective through a marketer’s
perspective
Appearance and packaging were first characteristics observed
Buying tie-downs is a low involvement purchase
The perceived value of the customer is not always the actual value
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House of QualityHouse of QualityHouse of QualityHouse of Quality
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Strap Storage DesignStrap Storage DesignStrap Storage DesignStrap Storage Design
Final Design:Final Design:Final Design:Final Design:
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Crank-WinderCrank-WinderCrank-WinderCrank-Winder
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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Crank-WinderCrank-WinderCrank-WinderCrank-Winder Normal Operating Force
How to Determine Sudden Spike in Forces
Two Options
– Experimentally
• Use Force Measuring Equipment
– Theoretically
• Mass of arm moving at a speed
To Many Assumption with Theoretical Calculation
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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Crank-Winder ExperimentCrank-Winder ExperimentCrank-Winder ExperimentCrank-Winder Experiment
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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Crank-Winder ExperimentCrank-Winder ExperimentCrank-Winder ExperimentCrank-Winder ExperimentExperimental Data:Experimental Data:
Calculated Forces at CrankCalculated Forces at Crank
Normal:Normal:
Worst Case:Worst Case:
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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Crank-Winder FEACrank-Winder FEACrank-Winder FEACrank-Winder FEA
•Factor of Safety: 3.49• Nylon 6/6 was used as material
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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Snaps for Hook StorageSnaps for Hook StorageSnaps for Hook StorageSnaps for Hook Storage Holds hooks in place
– Prevents straps from unwinding in storage
Simple and easy to use
Cheap to Manufacture
Fatigue Analysis
– Subject to repeated loading and unloading
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Fatigue Analysis for Hook SnapsFatigue Analysis for Hook SnapsFatigue Analysis for Hook SnapsFatigue Analysis for Hook SnapsModeled as a straight beam
Givens:
Unknowns:
δ
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Stress Amplitude vs. Cycles to Failure Stress Amplitude vs. Cycles to Failure Stress Amplitude vs. Cycles to Failure Stress Amplitude vs. Cycles to Failure
Approx. 0.70ksi
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Final DimensionsD=0.40 ind=0.32 inL=0.40 inb=0.25 inh=0.04 in
Fatigue Analysis for Hook SnapsFatigue Analysis for Hook Snaps
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Storage Compartments/PocketsStorage Compartments/PocketsStorage Compartments/PocketsStorage Compartments/Pockets Houses straps while
not in use
Dimensions acquired from crude prototypes
Tight fit increases ease of winding
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Overall Design - AppearanceOverall Design - AppearanceOverall Design - AppearanceOverall Design - Appearance Cequent desired a more modern look with
smoother edges
Must compromise size and functionality
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Overall Design - SizeOverall Design - SizeOverall Design - SizeOverall Design - Size Size is an issue to major retailers like Wal-Mart
– Major customer to Cequent
Overall size has increased by about 45%
– 165 in^3 to 240 in^3
– Increase depth at pockets
– Smoother edges and curves
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BudgetBudgetBudgetBudget
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
Items purchased: Quantity: Price:
Chalk box 2 $3.97
Dowel Rods 5 $0.91
Hot glue gun 1 $9.95
Total: $22.94
Item to be purchased:
Labor @ $65/hour 4 $260
Nylon shaft 5 ft. $3.55
Rapid Prototype 1 $200
Total: $463.55
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TimelineTimelineTimelineTimeline
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Meet Group & Assign RolesMeet/Talk with ClientProject ResearchBrainstormingProposal (Presentation & Report)Design Obtain/Order EquipmentExperimentation/VerificationMidterm (Presentation & Report)Finalize Design CharacteristicsWeb Page Design Final (Presentation & Report)
CompletedRemaining
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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SummarySummarySummarySummary Tasks Completed
– Rough Prototypes Built
– Stress Analysis
– Drawings Finalized and Approved
Tasks Remaining
– Finish Exact Prototype
• Test
– Create Labeling
• Marketing Research
Otto GerdemanOtto GerdemanOtto GerdemanOtto Gerdeman
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Project DeliverablesProject DeliverablesProject DeliverablesProject Deliverables Provide a new and fresh perspective on Cequent’s
products and the overall tie-down market
Produce a working replica of the redesigned packaging
– A wind-up and storage feature that improves functionality and adds value to consumer
– Create a more sleek and modern look
– Calculations that prove reliability, safety, and functionality
New packaging label that is informative and appealing
– Using Marketing concepts
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Questions?Questions?Questions?Questions?