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SOAPFebruary 27, 2014
Armstrong Hall of Engineering
1SOAP
Presentation Overview Project Identification/Development Body Team Braking Team Steering Team
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Project Objectives To empower kids To provide engaging experience Make car available as a kit
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Indianapolis Soap Box Derby Hosts Super Kids Race http://indianapolissoapboxderby.com/home
Super Kids Race
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Specifications
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Number of Children 100
Weight of Child and Adult 300 - 500 pounds
Height of drivers 4 – 6.5 feet
Number turns per child 2 – 3 per day
Height of Hill 40 feet
Max Speed 35 mph
Max Turning Radius 15 feet
Length of Track 1500 feet
Cost $1000
Braking Distance 300 feet
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Survey Results – Customer Priorities
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Survey Results - Cost
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Budget Breakdown Budget for 2013-2014 year - $1500 Budget remaining - $822.30 Current Cost of Prototype -
$791.14 Target cost for car – $1000
Future Expenses Front wheel breaks Rear steering system with override Rear axle mounting system
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Cost of Prototype2013 Expenses Toward Prototype Price
Seats 200
Seatbelts 49.98
Brake pads 36.71
ODYSSEY brake cable 32.95
2” x 4” x 8’ boards 15.54
½” 4 x 8 plywood 99.80
Spray paint 24.72
Wood Filler 11.58
Steering system 165.98
Wheels 123.88
2014 Expenses Toward Prototype Price
Axles 20.00
Seating Housing 10.00
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Design Evolution
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Prototype IV
Prototype I Prototype II & III
Design Process: Where are we?
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Body Team
Brake Team
Steering Team
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Team Breakdown
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Body Team: Nick F,
Lakshya G, Alexandra M.
Brake Team: Jake S,
Rachel P, Justin S
Steering Team: Nick L, Alan G, Pulkit P
Body Team
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Team Members: Nicholas Farley (team leader) Alexandra Milat Lakshya Gupta
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Questions/Comments
Braking Team
Team Members Jake Schramm - Project Leader Justin Sohn -Webmaster Rachel Pauley - Team Liaison
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Semester Progress Determined exact location of brake pedal Decided to buy new brakes parts as opposed to transferring old
ones Visited Go-Kart and Bike Shops to research new parts Research prices
Semester Progress Created Decision Matrix on Emergency Brake System Traveled to stores Matching tires on car Purchased Brake Parts Started assembling braking system Planning and collaborating on brake assembly with Steering Team
Gantt Chart
Emergency Brake System
Challenge with Tires Original tires would not work with our brakes Two Options
Buy 4 New tires Purchase 2 new tires for back wheels
Purchased Parts
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Purchased Parts
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Purchased Parts
Purchased Parts
Brake System Assembly (Pictures)
Attachment of Brakes on Car Planning Stage Collaborated with steering team
Axle Welding of Parts
End of Semester Prepare sketches for brake system Plan on how to apply brakes for next semester Prepare transitional document
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Questions/Comments
Steering Team
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Steering Housing Calculated the
location of the steering housing-14” tall 12” from front
Based off the angle of the steering shaft, location of the front seat and height of the car
Steering Housing 4x4 piece of wood
drilled into the floor of the car
Hood of the car rests on top of the housing
Attached steering wheel to steering shaft
Steering Housing
Drilled hole in the floor for the steering shaft
This allows the shaft to be attached to the linkage on the front axle
Underside of the Body Consisted of a
combination of our original design and a bedframe design
Decided on this after a 6-3-5 brainstorming activity
Underside of the Body Used 2x2 pieces of
wood and L-brackets
Will test deflection with the same test plan that was used on the old underside of the body
Axle Test
Step 1: We placed our front axle with the steering linkage fully assembled inside a clamp to support it
Axle Test
Step 2: Going by increments of 10 pounds, we slowly added weight to each spindle until the axle started to break
Axle Test
Step 3: At 160 pounds the screws on either side of the wood started to rip out of the wood
Solutions Change axle material Brackets Change orientation of U-bracket
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Questions/Comments
DFMEA (Separate into Teams) Steering System – 720/1000 RPN
Improper slip clutch setting Durability of Brakes – 200/1000 RPN
Must function properly during all day race Wheels Axle
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