156B Week 8

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

• • Finished initial prototype

    • Fabrication led to a concern regarding how to interface between the cutting wire and the mesh bag closing

      • If we weave the cutting wire through the mesh bag so that they both close at the same time, the cutting wire does not cut as well as without the mesh bag

      • Decided to keep these components separate - first close the mesh bag, then cut the algae

  • Tested initial prototype in Del Mar Lagoon

Accomplishments from Previous Week

• • Fabricated a prototype of our design

    • This includes the chicken wire housing, top and bottom sheet metal pieces, mesh bag, nylon cutting wire, and Delrin pieces to hold the cutting wire in place

  • Updated the first draft of the report and website with instructor/TA comments

  • Updated the sampler CAD drawing

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

• • Buy nylon music wire, fishing line, steel wire for cutting wire options (Tanima)

  • Look into waterproof camera purchase for camera visualization (David)

  • Look into waterproof LED lighting for camera visualization  (David)

  • Machine metal column pieces for sampler (Joseph)

  • Fabricate Dispenser (All)

  • Finalize cutting wire material choice (Bridget)

  • Fabricate weight holders for sampler (Joseph)

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

• • 5/13: Phone meeting with Chuck

    • Suggested to make cutting wire independent of mesh bag closing instead of woven within mesh bag netting

      • In this case, we discussed possibly having two wires: one for the cutting of the sample and the other for the closing of the bag

      • Top and bottom will close simultaneously

      • We decided to use this idea 

    • Camera quadrant visualization:

      • Will be used to take a picture/video of sampling area - post processing with video is fine

      • But for now he said main priority should be getting the sampler to work consistently

      • We narrowed down camera selection to 2 choices, and will ask Chuck what he thinks

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

• • 5/9 Instructor meeting

    • Suggested welding metal pieces together (top/bottom cylindrical sheet metal pieces, sheet metal pieces that go around the mesh wiring) and then wrap mesh around structure

      • As of now, we are going to fasten the cylindrical sheet metal pieces with screw/nut/washer but we are considering welding for the final design

    • CAD is high priority - it will help with figuring out how everything interfaces with each other

      • We updated the CAD drawing - still working out some minor details

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

• • Should we use Nylon wire or fishing wire to cut?

  • What material should we use for the cord/tubing and how should we interface it with the capsule?

Resources or Information Required but not Available

• • N/A

Schedule

• • Buy various cutting wire parts (5/18)

  • Purchase camera and LED lighting (5/18)

  • Finish 2nd draft of the report (5/20)

  • Machine metal column pieces (5/17)

  • Buy mesh bags (5/18)

  • Buy cord/tubing (5/18)

  • Go to fisherman shop to buy fishing line (5/17)

Budget (list amount spent and amount remaining)

• • Spent: $111.87

  • Remaining: $2488.13

Progress on Report and Webpage

• • Updated first draft of report, accounting for instructor feedback

  • Updated budget sheet on website

  • Added report and CAD files to website