156B Week 8

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Friction drive with rotary pump

    • Status: assembled and tested

  • Test results: 3 GPM

  • Conclusion: need to implement two pumps with this system to achieve 5GPM reliably

  • Belt drive system to vary gear ratio for power transmission

    • Status: assembled

  • Slider crank mechanism with diaphragm pump

    • Status: close to assembled

    • Test results soon!

*Focus designs around single speed bike --> adjust size and gear ratios to be compatible with OX1

Accomplishments from Previous Week

• • Designed and machined parts for slider crank mechanism

  • Re-tested friction drive assembly to verify low performance (3 GPM) results from initial test

  • Revised final report to reflect instructor comments and added additional content

  • Purchased second rotary pump

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Test slider crank mechanism - Brandon, Jessica, Dennis

  • Determine optimal water pump design based on final tests

  • Machine secondary pump attachment- Dennis, Jamie

  • Research water purification procedures - Jamie

  • Finish report - Team

  • Finish webpage - Kyle, Derek

  • 12V power generation demonstration- Kyle, Derek

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Next meeting with sponsor is 5/30/17

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Meeting in person 5/17/17

    • Friction drive assembly

      • Verify RPM of motor (company provided specs may not be entirely accurate) and make sure pump is running at 4500 RPM

        • Action: verified RPM with Extech Laser Tachometer

      • Purchase 2 pumps to achieve needed flow rate

        • Action: purchased second rotary pump

      • Can try motor driver and write short code to alter PWM

    • Slider crank assembly

      • Can implement power grips on bike pedals to increase pull from rider on uptake stroke

      • Determine where is best to place pump: set on ground vs. mount on bike 

    • Additional comments

      • Potential issue= not always being able to get close to a water source while pumping

      • Have CAD to document all designs and have material to present to sponsor at end of quarter

      • Provide sponsor with cost estimates and manufacturer info regarding parts that can be bought in bulk

      • Showcase proof of principle with standard bike (don't worry about OX1 yet)

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • N/A

Risks and Areas of Concern

Resources or Information Required but not Available

• • Have not seen newest iteration of OX1 design yet

Schedule

• • Presentation - Wed

  • Report -Fri

  • Website - Fri

Budget (list amount spent and amount remaining)

• • Spent $548.90

  • Remaining $1,951.10

Progress on Report and Webpage

• • Report - 75%

  • Webpage - 50%