156B Week 6

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

• • 3D print of Car and Penguin models done

  • Problem with getting suction cup to seal well

  • Looking to finalize designs

Accomplishments from Previous Week

• • 2nd prototype of interlock design (Penguin shape) was printed

    • Lid needs slight tweaking

    • Finger slot needs more space for easy release

    • Eating areas need to be more rounded

    • Suction cup needs a way to seal correctly (threaded hole leaks air)

  • 1st prototype of snap on design (Car shape) was printed

    • Dimensions need work: eating area, space for suction cup

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

• • Ebrahim - Fix Car model

  • Jinfeng - Find alternative suction cups that may fix seal problem

  • Nima - Update budget

  • Emmanuel - 3D print Penguin (Delivered by Monday of week 8)

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

• • 5/7/12

  • Wants to still work on both designs

    • Believes both designs can be brought to market

  • Emphasized the importance of working suction cup

  • Considered colors for Penguin (baby blue tray, white or clear lid?)

    • Clear lid would allow consumer to see the inside of the tray while inside packaging on the shelf

    • Opaque lid would look more aesthetically pleasing

  • Would like to see colored prototype, or prototype with smoother surface

    • Voiced concern about ability to draw on the lid with dry erase markers

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

• • 5/8/12 (Presentation Comments)

  • Excellent CAD and annotation

  • Great progress on prototype

  • Get an estimate for molds for designs (Better to get feedback now)

    • Create cost breakdown: Material, Suction cup, Mold

  • Like the design but lid is still a challenge (on penguin). It is not obvious or easy to take lid on or off

    • Maybe relax the requirement of the flat lid => open up possibilities (eg. knob)

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

• • Lid design

    • Tray should have face, even without lid

    • Lid design that can be interchangeable with other designs (not just with the penguin)

    • If snap-on lid is tough to take off => might cause food to go everywhere

    • Multiple lids

    • Prototype lid with thermoform (0.01" PVC)

  • Suction cup seal issues

    • Teflon/nylon tape

    • Loctite (look on website for correct type)

    • O-ring

    • Recessed metal nut in base

  • Finger hold size concerns

Risks and Areas of Concern

• • Lid design for Snap-on

  • Suction cup sealing well

    • Modify threads, extrusion design, new suction cup

Resources or Information Required but not Available

• • N/A

Schedule

• • 3D print penguin in Week 7

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • $698 remaining

    • Need to update with suction cup purchase, probably around $30

  • About 20 cubic inches left of 3D print material

Progress on Report and Webpage

• • Starting next draft of report