156B Week 2

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

• • Analysis:

    • Preparing for statistical repeat-ability test on Nafion length tracking using feeder mechanism

  • Design:

    • Nafion "feeder" prototype and test platform development in progress (RISK REDUCTION PART 2)

      • Verifying basic "peeling without damaging" functionality with roller prototypes wrapped with rubber material

    • Working toward individual subsystem design concepts

      • Second spool height adjuster

      • Mounting components (brackets, turntables, etc.)

      • Electronic components 

  • Tests

    • Setting up test platform for feeder mechanism

Accomplishments from Previous Week

• • Iman/Pat/Anthony

    • Designed parts for feeder mechanism prototype

  • Iman

    • Machined aluminum parts for feeder mechanism prototype

      • Positive and negative rollers

      • Shaft mount

  • Pat+Anthony

    • Threw together rough prototype of feeder mechanism with Aluminum scrap and rubber bands

    • 3D printed parts for feeder mechanism prototype

  • Jhon

    • Updated pretty CAD of feeder mechanism

  • Anthony

    • Sketched height adjustment design concepts

    • Identified tests for Nafion guide functionality

      • Roller based? Or static guide based?

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

• • Verification of feeder mechanism design feasibility (WHOLE TEAM)

    • Fully fabricated test platform

    • Nafion failure characterization after running through feeder mechanism

      • Running pressurized air through and observing leaks, blockage, etc.

      • Measuring wall thickness to ensure deformation is below threshold

  • Design of feeder mechanism prototype REV2 for statistical length tracking test (Jhon)

    • Project specification to spool 160 +/- 5ft of material, need to estimate length during spooling

    • Proposal to assume no-slip at feeder mechanism roller interface, and track roller rotations with encoders

    • Will update feeder mechanism prototype with motors and encoders to do length tracking capability test

  • Nafion guide designs, prototypes, and analysis (Anthony)

    • Smooth "guide" based (like a metal ring that Nafion passes through)

    • Roller based system

      • ensure good way of keeping tubing from "falling out" of roller

  • Second spool design development (Iman)

    • Decide on material and investigate machinability, cost, and primary functional requirements

  • Overall system mounting considerations and design development (Pat)

    • What components move? What components don't move?

    • How to constrain them in effective, cheap ways?

  • Determine specifications for electronic parts, toward ordering by mid week 3 (Anthony and Pat)

    • Motors + encoders

      • DC? Steppers? 

    • LCD screen compatible with Arduino Mega

    • Motor driver and power supply

      • Will be based on motor decisions

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

• • N/A (to be updated after Sponsor meeting 04/09 2:30pm

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

• • O-ring for feeder mechanism-Nafion interface

    • Determined O-rings may be too thin, investigated parts with larger thickness and similar high friction material

    • Purchased rubber bands and bat grip to test

    • Looked into flat belts, vacuum belts

  • Draw 2D FBD of the whole system

  • Potential over-rotation of manufacturer's spool when peeling Nafion

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

• • Deformation of Nafion due to inter-roller force in feeder mechanism

  • High friction causing rubbing, impeded motion, jumping, etc. in Nafion guide components

Resources or Information Required but not Available

• • N/A

Schedule

• • Describe upcoming milestone

    • Verification of feeder mechanism performance and motorized prototype design development by 4/16

      • Peeling capability

      • Does not deform 

      • Toward length tracking test

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Rubber bands, bat grip - $6

    • $1794 remaining

Progress on Report and Webpage

• • Report 0%

  • Webpage - current progress report and Gannt chart updated