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MB1Advisory Committee Review
April 27, 2006
Jake Adkins – Frame and SuspensionYa-Chi Chou – Accessories/Seats
Adam Dean – Power TrainJay Mansheim – Power Train
Saptarshi Mitra – Budget/AccessoriesEric Rodgers – Frame and Suspension
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
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
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
Budget
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
Expense Report
Grand Total
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
Design Conditions
Reliable for a minimum of 10 miles Braking from 20 mph to 0 mph in 20
feet
TEAM
Safety Factor
General 2 Critical Weight 1.5 High Dynamic loading (suspension)
4+
JM
Frame and Suspension
ER
Frame (orthoscopic)
ER
Frame (top view)
WaterJet files drawn in AutoCad
Shear and Moment Diagrams
ER
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
ER/JA
ER/JA
ER
Frame Hinge Assembly
JA
Drive Train
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
ER/JM
Original Chain Path
JM/ER
Original Chain Path
Modified Chain Path
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
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
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
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
Problems Encountered
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.
Rear Upper Air bag support brackets
MEA (mental element analysis) failed.
Corrective Action: adding cross-sectional area to failed area
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.
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
Chain breaking Chain was catching
on sprocket mounting bolts.
Corrective Action: countersunk bolt heads
Back of rear seat Rear seat back
broke
Corrective Action: welded it.
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.
Things we would have done different.
More emphasis on handlebars and rider ergonomics.
Try to stick closer to manufacturing timeline.
Limit weight
Questions?
Questions?
PITT THUNDER