Week 3

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

• • Created different silicone samples using the Ecoflex mix

    • Thick

    • Thin

    • Combined with glass marbles

  • Done a number of tests

    • Plastic

    • Ice pack container

    • Belkin bag

    • Memory foam pillow

    • Glass tile

    • PP bag

    • Thick silicone

    • Silicone with glass marbles embedded

Accomplishments from Previous Week

• • Acquired silicone mixture

    • Created numerous samples

  • Ran a number of tests on materials

    • Eliminated hot/cold pack, ice pack container, foam pillow, PP bag

    • Leaning more towards Belkin bag with sand or silicone as a filler

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

• • Finishing CADing first prototype (Stephanie)

  • Begin fabricating prototype (Johnson, Allen, Daniel, Stephanie)

  • Begin programming Arduino (Johnson, Allen, Daniel)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (1/18/2012)

• • Want something that doesn't have too much friction

    • Looked into baby powder to reduce friction/stickiness

  • Fine if silicone is replaced every 3-6 months

    • For the foreseeable future, silicone will serve as our skin material

  • Silicone skin layer should be easy to remove

    • Looking into ways to incorporate into our design

  • Move away from sand as much as possible

    • Created a silicone and glass marble combination for possible filler material

  • Have something rigid as the structure, and something more malleable on top

    • Looking into an aluminum structure with silicone on top

  • Convex surface matters the most

    • Ensuring that the design can produce a convex surface

  • Any concavity/convexity would be good as the babies are currently on a flat bed

    • Looking into ways to produce both shapes

  • If you can fit the doll, that would be about as big as premature babies get

    • Plan to make the device 1'x1.5'

  • Priority: heating slab

    • Created potential slab with silicone with marbles embedded, and silicone as top layer

  • Core piece should be twice the volume of the baby

    • Did some calculations to figure out how much silicone we need

Instructor Comments from Last Meeting and Actions Taken to Address these Comments (1/18/2012)

• • Add dates of our meetings to our Reports

    • Made sure to add the date for this week's report

  • If you want to control the heat, probably use the motor driver

    • Spoke with Steve Roberts, who then outlined how to set it up with a Screw Terminal

  • Look into the specific heat of the different filler materials

    • Tested for specific heat of the glass marbles, silicone on its own, and silicone mixed with marbles

  • Thermal analysis

    • Did tests to see measure temperature of the materials

  • Maybe use an ice pack as a container that does not melt

    • Bought one from CVS, which did not work

  • Buy a thermometer to measure temperature outside thermistors

    • Found that Isiah has thermocouple thermometers downstairs

  • Look into a motor driver board/something with screw terminals

    • Purchased an Arduino Screw Terminal

Risks and Areas of Concern

• • What if silicone and glass marble mixture is not safe as a reservoir

  • Where could we find something like sand, or clean sand

Resources or Information Required but not Available

• • Properties of silicone relevant to us from Smooth On

Schedule

• Describe upcoming milestone

  • • Fabricate first design and start on second design

• Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Silicone mixture ($32.28)

  • Smooth On Clay ($4.70)

  • Silicone Ease Spray ($13.20)

  • Arduino Screw Shield ($19.94)

  • emaining Budget = $1329.25 - 70.12 = 1259.13

Progress on Report and Webpage

• Report guidelines have yet to be posted on class website

• Added Weekly Report #3