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MB1Advisory Committee Review
April 27, 2006
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Jake Adkins – Frame and SuspensionYa-Chi Chou – Accessories/Seats
Adam Dean – Power TrainJay Mansheim – Power Train
Saptarshi Mitra – Budget/AccessoriesEric Rodgers – Frame and Suspension
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Race Day Results
3rd Place Time of 5:08
Design Competition Winners For best solving the problem of
navigating the lunar surface Most Improved Time
First run 7:21 Second Run 5:08
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Aug Sept Oct Nov Dec
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Concept Design x x x x x x x x x x x
Concept Drawings x x x x x x x
Final Concept Agreement x
Component Research x x x x x x x x x x x x
Drawings x x x x x x x x x x x x x x x x
Stress Analysis x x x x x x x
Component Acquisition x x x x x x x x x
Component Fabrication x x x x x x x
Testing
Clean up
Install Instrumentation
Instrumentation Testing
Buggy Testing
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Jan Feb Mar Apr
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
Concept Design
Concept Drawings
Final Concept Agreement
Component Research x x x x
Drawings x x x x x x x x x x x x
Stress Analysis
Component Acquisition x x x x x x x x x x x x x
Component Fabrication x x x x x x x x x x x x x x x x
Testing x x
Clean up x
Install Instrumentation
Instrumentation Testing
Buggy Testing x x
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Budget
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Source Amount ($)
MB One Members 600
PSU 200
Electronic Systems Grant 0
Caterpillar 1600
Snorkel International Paint
VanBecelaere Machine Works Steel
Total 2400
Funding
TEAM
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Expense Report
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Grand Total
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Design Conditions
Complies with all rules set forth to compete in the NASA competition in Huntsville, Alabama on April 13-14, 2007.
Weight: 80 lbs (192 lbs actual) Top Speed of 20 mph Able to handle 17” obstructions on
various types of terrain
TEAM
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Design Conditions
Reliable for a minimum of 10 miles Braking from 20 mph to 0 mph in 20
feet
TEAM
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Safety Factor
General 2 Critical Weight 1.5 High Dynamic loading (suspension)
4+
JM
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Frame and Suspension
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ER
Frame (orthoscopic)
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ER
Frame (top view)
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WaterJet files drawn in AutoCad
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Shear and Moment Diagrams
ER
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OPERATION WORK INSTRUCTION
Part NumberPart Description
101 Frame Beam, Front
Created by:
ERChecked by: AD
Date: 11/26/2006 Date: 11/26/2006
Material: 1020 HR SFM: 120
Operation #
Operation Descript
ionMachine
UsedTooling/
FixtureTolerance
Speeds, Feeds
1Cut Material
Horizontal Bandsa
w +/- .030
2 Mill Slots Bridgeport
V-blocks, 3/8"
End Mill +/-.0031222
RPM
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ER/JA
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ER/JA
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ER
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Frame Hinge Assembly
JA
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Drive Train
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Design Considerations
Both riders power one output Chain tension constant during setup Differential Differential Placement/Drive shafts Usable 7 speed gear range Quality Components/adjustment Wheels/tires
AD/JM
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ER/JM
Original Chain Path
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JM/ER
Original Chain Path
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Modified Chain Path
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Target Gear Ratios
High gear ratio of 2.2:1 Low gear ratio of .8:1 Have a useable range of gears spaced
in between to have a total of 7 speeds
AD
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Gearing Options
Option 1 56/22/34-11/39 Max Speed 13.8 mph @ 80 rpm Max torque 324 ft lbs @ 350 lbs input
Option 2 56/16/34-11/39 Max Speed 18.9 mph @ 80 rpm Max torque 238 ft lbs @ 350 lbs input
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Item QTY Make/Have Price ea. Totals
Bottom Bracket Case 2 0 $7 $14Bottom Bracket 2 2 $24 $0Plastic BB seal 2 0 $1 $2Crank Set 2 2 $30 $0Chainrings / Freewheels 6 0 $15 $90Cage Pedal Set 2 1 $15 $157 Speed Cassette 1 0 $25 $25Output Shaft/ Bearings 1 x $10 $10Derailer 1 0 $70 $70Shifter / Cables 1 0 $50 $50Differential 1 1 $0 $0Differential Drive Gear 1 0 $15 $15Universal Joints 4 0 $20 $80Driveshafts 2 x $10 $20Diff. Bracket / Bearings 2 2 $0 $0Chain ( 5ft ) 4 0 $25 $100Misc. brackets / etc. 1 x $25 $25
$516
Wheels 4 0 $30 $120Tires / Tubes (26x2.5+) 4 0 $35 $140Wheel Bearings 4 0 $5 $20
$280
Hydraulic Brake System 1 0 $125 $125Hyd. Cable ( 8ft ) 1 0 $20 $20
$145
$941
Sub Total =
Sub Total =
GRAND TOTAL (Drive Train, Wheels, Brakes) =
POWER TRAIN BUDGET
Sub Total =
AD
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Simulated Items
Manufactured out of plastic Vinyl - ABS/PVC Alloy (Density: 0.6
g/cm³) Console, Battery box, TV box, Fender,
some simulated items will use this material
SM/Y-CC
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Problems Encountered
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Failure to fit in 4x4x4 box Best solution would
be to be a total redesign.
Corrective Action: installed a hinge on the front pedal tower.
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Rear Upper Air bag support brackets
MEA (mental element analysis) failed.
Corrective Action: adding cross-sectional area to failed area
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Rear A-arms Rear A-arms were
bent after testing on obstacles.
Corrective Action: added gussets to high stress points on rear lower A-arms.
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Driveshaft pin connection Pins were sheared
multiple times on rear inboard Universal Joints
Corrective Action: Welded it
Jammed an Allen wrench into it and broke it off
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Chain breaking Chain was catching
on sprocket mounting bolts.
Corrective Action: countersunk bolt heads
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Back of rear seat Rear seat back
broke
Corrective Action: welded it.
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Fenders Fender mounts failed
when bent three times
Corrective Action: Redesign of fender mounts.Problem was fixed for the race by simply removing the fenders.
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Things we would have done different.
More emphasis on handlebars and rider ergonomics.
Try to stick closer to manufacturing timeline.
Limit weight
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Questions?
Questions?
PITT THUNDER