manually adjustable stilts “easy lifts” 1 intro ideas problem design analysis budget schedule...
TRANSCRIPT
MANUALLYADJUSTABLE
STILTS
“Easy Lifts”
INTRODUCTION
1
INTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
GROUP MEMBERSTrent HilliardIan JuurlinkBrad PoirierMitchell Weir
SUPERVISORDr. Marek Kujath
INTRODUCTION
2
INTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
PROBLEMINTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
3
CURRENT STILTS:
1. Used for tasks requiring small rises in elevation
2. Difficulties:• Getting on stilts• Picking up objects• Adjusting
PROBLEMINTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
4
PROBLEM
5
INTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
GETTING UP:
PROBLEM
6
INTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
PICKING UP OBJECTS:
PROBLEM
7
INTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
GETTING DOWN:
PROBLEMINTRO
IDEAS
PROBLEM
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
8
LIFTING DEVICE
1. Power screw
IDEAS
http://forums.vwvortex.com 9
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LIFTING DEVICE
2. One leg-lift
IDEAS
10
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LIFTING DEVICE
3. Hydraulic Scissor Lift
IDEAS
11
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
www.autoliftuk.com
LOCKING DEVICE
Rotary Ratchet
IDEAS
www.wikipedia.org
www.istockphoto.com12
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LIFTING DEVICE: SCISSOR LIFT
DESIGN
13
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LIFTING DEVICE: SCISSOR LIFT
DESIGN
14
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
1. Member Design
2. Member Confinement
3. Assembly Materials
• Aluminum• Bushings• Snap Rings
LIFTING DEVICE: SCISSOR LIFT
DESIGN
15
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LOCKING MECHANISM:
DESIGN
16
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LIFTING DEVICE: SCISSOR LIFT
DESIGN
17
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
LINEAR DAMPER:1. Gas Spring2. Provides upward force3. SAFETY feature
DESIGN
18
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
FORCE DETERMINATION:
ANALYSIS
19
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
W = Force Applied L = Length of Beam D = Location of Center of Gravity
Stress Analysis:
ANALYSIS
20
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
0 5 10 15 20 250
5
10
15
20
25
30
35
40
45
50Stress in Most Heavily
Loaded Beam
Height (in)
Str
ess (
ksi)
Aluminum Yield Stress
Total StressBending & Axial
MinimumLockingHeight
BUDGET
21
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
Item Item Cost Qty. Total CostStilts $365.00 1 $365.00Bearings $1.41 16 $22.56Bushings $0.72 16 $11.52Aluminum Plating $88.16 1 $88.16Steel Flat Bar $6.96 2 $13.92Aluminum Flat Bars $6.30 6 $37.80Pins $6.00 2 $12.00Concept Prototype $50.00 1 $50.00Snap Rings $36.31 1 $36.31Actuator $30.00 2 $60.00Locking Mechanism $74.80 1 $74.80Damper $50.00 2 $100.00
TOTAL (with 10% contingency) $1,274.16
CRITICAL SCHEDULE ITEMS
Jan/14/10: Final Drawing Submission
Feb/01/10: All material obtained
March/01/2010: Fabrication and assembly
SCHEDULE
22
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
CRITICAL SCHEDULE ITEMS
March/22/10: Testing
April/08/10: Final report submission
April/10/10: Final presentation
SCHEDULE
23
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
WHAT’S LEFT?
1. Fine details on locking mech.
2. Finalize the damper force
CONCLUSION
24
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
QUESTIONS?
CONCLUSION
25
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
WALKING WEIGHTS:
1. Current Stilts weight: 15.5 lbs.
2. Competitor stilts: 14-17 lbs
3. Miner’s work boots: 7 lbs
4. Target stilt weight: <20 lbs
CONCLUSION
26
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM
CONCLUSION
27
INTRO
DESIGN
ANALYSIS
BUDGET
SCHEDULE
CONCLUSION
IDEAS
PROBLEM