156B Week 3

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

• • Conducted and finished preliminary tests for feeding mechanism. 

  • Designed preliminary test for new peeling mechanism

    • Machined polypropylene pulleys

Accomplishments from Previous Week

• • Tested PP mesh for friction drive system

    • Was not successful

  • Setup preliminary test bed

  • Got PP samples from Mcmaster

  • Machined polypropylene pulleys

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

• • Order arduino mega, motor driver, DC motors (Patrick/Anthony)

  • Design second spool and machine out of polypropylene (Iman)

    • Order more polypropylene

  • Investigate tensioner devices (Jhon)

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

• • Cannot use anything other than polypropylene (or teflon) to interact with Nafion

    • Contamination is very important

    • Got PP samples and machined temporary spools/pulleys

    • Began redesigning peeling mechanism

  • Look into tensioner (clutch) system to monitor tension in tubing

  • Tracking requirement was confirmed as plus or minus 5 ft

  • Interface requirements were confirmed to be just start and stop commands with error flag

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

• • Look into high precision stepper motor

    • Confirmed with sponsor that this is not necessary, ie. length tracking requirement

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

• • Peeling mechanism

    • Since high friction materials may react with tubing, peeling mechanism has to be redesigned

  • Length tracking

  • Tensioning system

Resources or Information Required but not Available

• • N/A

Schedule

• • Preliminary design proposal (April 16th, 2019)

  • By week 5

    • Finalize peeling and tensioner mechanism

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Budget Remaining: $1724:

    • Target: $6

    • Home Depot: $30

    • Surgical PP Mesh: $10

    • Turntables: $30 

Progress on Report and Webpage

• • N/A