156B Week 7

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

• • Started fabricating an initial prototype - will finish this week and run tests on it

  • Completed initial CAD design

Accomplishments from Previous Week

• • Got all of the parts we need for the prototype and started the initial prototype

    • We worked with Ian to machine the parts we have, but we are not quite done

  • Discussed cutting methods with Ian - we now have a few more ideas to try

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

• • Purchase Camera and LED lights (David)

  • Finalize initial CAD (Joseph)

  • Figure out budget forms (All)

  • Purchase steel wire and fishing line (Tanima)

  • Purchase mesh bags (Bridget)

  • Finish Prototype (All)

  • Edit Report (All)

  • Purchase torsion spring to hold mesh bag open (David)

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

• • Meeting with Chuck on 5/5:

    • He suggested getting fishing line as an option for the cutting wire

      • We will purchase fishing wire and test it's capability

    • We are using sheet metal for the prototype, but sheet metal corrodes over time

      • Chuck suggested plastics or high-grade/marine grade stainless steel instead

        • We are most likely going with stainless steel for the final design

    • We mentioned adding weights on sampler (to stabilize and provide enough force to cut):

      • Chuck suggested having a collar of with spokes (or holes) going around the circumference at the bottom of the sampler to keep the sampler stable

      • The spokes (or holes) could be used to add weights

        • We are considering adding this into our design, but we will first see if the sampler has enough stability and weight without it

    • Chuck said 20 pounds should be the max weight of the sampler

      • We are trying to keep the weight within 10 - 20 pounds

    • Having 2 cords 15 feet down interfacing with the sampler could lead to cord entanglements

      • We are looking into ways to avoid entanglements

    • Attaching mesh bag inside sampler might be a problem

      • Some options that we are looking into:

        • Zipties

        • Velcro

        • Stiffener inside bag for spring action

    • Prototype testing

      • Suggested we test cords by winding and unwinding to determine degree of cord entanglement

        • We will test this after we finish the prototype this week

    • Budget

      • He said SPAWAR SSC will provide $3500 worth of buying material

        • MAE department will need to allocate between the student project and machine shop expenses

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

• • The report needs work (various comments)

    • Will finish editing this week based off instructor and TA comments

  • Wire crimping is a potential idea to use with wire cutting

    • talked to Ian, it is actually called swedging

    • he gave us other ideas around the same concept that we liked more (particularly one that involved a set screw) that we are looking into

  • Asked if sponsor is okay with replaceable parts

    • Brought up idea to sponsor during weekly meeting - was okay as long as it's not too expensive

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

• • There are conflicting views on what our budget is!

Resources or Information Required but not Available

• • N/A

Schedule

• • 5/9: Team meeting

  • 5/10: Finish Prototype

  • 5/12: Test Prototype

  • 5/13: Finish edit of report

Budget (list amount spent and amount remaining)

• • Spent: $111.53

  • Remaining allocated budget: $2,488.13

Progress on Report and Webpage

• • Have finished a first draft of both the report and webpage - will edit them this week