1 Group 11- ASME Design Competition Alicia Christie Desmond Bourgeois Toddrick Ruff

2 Overview of Design Competition Schematic of Test Course Optimize Score Weight Power used (mAh) Time Accuracy Follow Competition Rules Size (14.5 x 6.5 x 6.5 in)

3 Decision from Last Presentations 3 – Wheel Design Rock Collector Mechatronics, Ariel University Center

4 Changes to Drive Train Old Design

5 New Design Lighter Decreased Complexity Increased Reliability Increased Modularity Changes to Drive Train

6 Motors DTXC 3315 Speed Controllers DTXM 1280 and 1281 Gear and Motor Selection Gears Material: Molded Nylon Torque: 4:1 Speed: 1.5:1

7 Control Logic Tele-operation Wireless No Fabrication Big Transmitter Umbilical Cord Tethered Fabricated Control Box More Compact Umbilical Cord Old DesignNew Design

8 M1M3 M6 M4 M2 M7 M8M9 Control Logic Channel Number Signal Type Analog: Ch# 1-4 Digital: Ch# 5-6 Top view of robot

9 Platform Design Old DesignNew Design

10 Changes to Rock Collector ½” shorter length Walls are Cast Acrylic and spaced with putty to make lighter Difference is 224.3g Density of Aluminum 2.70g/cm 3 Density of Cast Acrylic 1.2g/cm 3 Old Design New Design

11 Expandable Body Expansion based on design changes is 3.61” 2y – x = 3.61” x = 0.95” y = 2.28” x y Light-weight spring-assisted knives

12 Removing Material from Backing Problem –Weight is a constrain on the overall score –Rock Collector Backing Al 6061 Solution –Remove material from robot Strength is important!!!

13 Swiss Cheese Design Inspiration Avoid notch stress concentration

14 X-Bracket Design Inspiration Bridges and trusses Notch stress concentration

15 H-Bracket Design Inspiration Least material possible

16 Thanks To Sponsors American Society of Mechanical Engineers Boeing Individuals Dr. Carl Moore Dr. Dave Cartes Dr. Chiang Shih Dr. Daudi Waryoba

17 References Density of Aluminum : Density of Plexiglas: