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Group 5 Self-Assembling Picnic Table Group Members: Lee-Jen Chen (Andy) Shi Li (Jeff) Spencer Soloduka Kwun Fong Tse (Ken) Supervisor Alex Kalamkarov.

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Presentation on theme: "Group 5 Self-Assembling Picnic Table Group Members: Lee-Jen Chen (Andy) Shi Li (Jeff) Spencer Soloduka Kwun Fong Tse (Ken) Supervisor Alex Kalamkarov."— Presentation transcript:

1 Group 5 Self-Assembling Picnic Table Group Members: Lee-Jen Chen (Andy) Shi Li (Jeff) Spencer Soloduka Kwun Fong Tse (Ken) Supervisor Alex Kalamkarov

2 Self-assembling Picnic Table Objective: Design self-assembling collapsible furniture Once initiated by button, the assembly process requires no human contact Fully functional picnic table that can be collapsed to minimized space for storage/transportation Suitable for indoor or outdoor use Must seat at least 4 people (100 kg each) with sufficient table space Should be carried by one adult (< 50 lbs) Must be safe! 1

3 Final Solution Opened ModeCollapsed Mode 2

4 Components: Chairs Table Central Transmission Motor and Battery Control System Presentation Contents 3

5 The Chairs (Main Features) Chair Surface Chair Frame Rear Legs Front Legs L-Bracket Torsion Spring Ropes 4 Prototype (Bottom View ) Prototype (Standing)

6 The Chairs (Opened / Collapsed Mechanism) CollapsingOpening 5

7 The Chairs (Stress Analysis) 220 lb Yield Strength of Steel ≈ 310 (MPa) 195/310 = 63% 6

8 The Table Opened Mode Collapsed ModeTop View A ring is underneath the table for support and guidance. 7

9 The Table 8

10 Table Pieces Table pieces are held together using 16 pieces of fabric. TopBottom Side View Table Piece Fabric 9

11 Table Piece Each table piece is made of one piece of ABS plastic and 2 aluminum support channels. The U bar is for connection to the central shaft. 10

12 Support Channel Stress Analysis Under a 50lb load, the maximum stress on the aluminum channel is 210MPa (Yield strength of Aluminum alloy 6061-T6 is 270MPa). The maximum deflection is approx. 9mm. 12’’6” 11

13 Central Transmission A set of spur gears connects the motor and the lead screw. The screw sits on a thrust bearing. The nut does not rotate so it moves up and down. 12

14 Motor & Battery 24V, 4200mAh NiMH rechargeable battery pack 5.0A discharge rate 24V DC gear motor, approx. 69W 179 RPM, in-lbs 13

15 Motor control circuit One-push button Checks potentiometer connected along transmission against reference resistor (R=0 -> open, R = Rref -> closed) 4-way switch reverses polarity of motor 14

16 Safety control circuit Purpose is to disable adjacent control circuit in the case that the table is loaded Checks 4 strain gauges mounted on each chair against four reference resistors (uses strain gauges on unloaded material for temperature compensation) Uses normally closed magnetic relay to control power to motor circuit 15

17 Control system – System coupling 16

18 Conclusion 17

19 Conclusions – Results (Dimension) Opened ModeCollapsed Mode 18

20 ItemsMaterialsWeight (lb) Chair (x4)Aluminum, Steel, Plastic24 TableAluminum, ABS10 Central StructureAluminum, Steel10 Motor & BatteryN/A4 Control SystemN/A0.5 Total Weight:48.5 Conclusions – Results (Total Weight) 19

21 Conclusions - Budget ComponentsCost Chair (x4)$360 Table$370 Central Structure$150 Motor & Battery$350 Control System$175 Contingency (15%):$210 Tax (15%):$242 Total:$1858 Allotted amount:$

22 Conclusions – What’s next Full scale prototype Procurement of materials and custom fabrication  Consult technicians  Design build report II Spec. components for control system  Simulation  Determine placement on system Assembly Testing Modifications/optimizing Final Design Report Lessons learned 21

23 Thank You! Supervisors Dr. Alex Kalamkarov Shane Yates Prototype Reg Peters Angus MacPherson Consultation Dr. Robert Bauer Dr. Lukas Swan Funding Shell Canada 22

24 Questions? 23


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