156B Week 4

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

• • The cart must be no larger than 26" in diameter, such that it can fit into most vivarium labs. Using SolidWorks, each tier can fit a 11 cage lids (and 22 small wire components).

• The components will be held into place on each tier by rods that are spaced out 3.28" apart on a 11.63" diameter circle and will be placed vertically

Accomplishments from Previous Week

• • Since last week, the team has finalized the cart design to: 

    • Be a single unit, rather than stackable and un-stackable tiers.

    • Be a single unit that would rotate together, rather than rotating independent tiers

    • Have a universal design in each tier which will decrease the amount of components that could potentially be placed if it weren't universal, but easier to manufacture

  • The team has decided that the components will be placed in the cart lengthwise (vertically) so that the cart can be made smaller

  • The team aims to have adjustable tiers on the cart

  • Plan to have a riboflavin test with Prototype #2 to ensure that all components can be washed effectively with the circular spinning design

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

• • Create the third iteration of our prototype with multiple tiers and smaller diameter so that the components can be placed lengthwise (vertically):

    • Find a basket or circular grid that is 26" (Annie)

    • Figure out how to place rods onto the basket as component separators, i.e. is it better to weld or tap the rods? (Kelli)

    • Model cart design on SolidWorks (Jonathan)

    • Figure out how we can attach multiple tiers on our prototype so that we can build it quickly to test next week (Yuji)

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

• • The team sat in a meeting with all the vivarium lab supervisors and discussed what type of cart they would want to use: (ALL comments were made on 1/25 in person)

    • The supervisors were excited about an stackable and un-stackable cart, but after discussing with our sponsors, they do not view that as a priority 

    • They had concerns about the size of the cart and wanted them to fit into the labs so we have decided on a design where we place the components in vertically, which will decrease the diameter of the cart

    • We asked them about what the price they believe the cart should be and have decided that it should fall in between what a "Mule" costs (~$200) and a "Llama" (~$3000)

      • We have also asked our sponsors to give us data of how many components they wash every day so that we can have a goal of how many components we want each cart to hold at a minimum

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

• • Look for already made parts to make our prototype rather than trying to fabricate everything (01/24)

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

• • No comments from other students

Risks and Areas of Concern

• • How many tiers can the cart have before it becomes too unstable and falls over too easily?

  • How do we attach or secure each tier on the cart?

  • How big does the lazy susan need to be to hold the entire weight of the cart?

Resources or Information Required but not Available

• • After finalization of design concept and components needed, we will need to find out the best places to obtain required materials.

Schedule

• • Meet with sponsors on Friday 2/1 and discuss our current design with them.

  • Test Prototype #2 to see if components are adequately cleaned on Friday 2/1

Budget (list amount spent and amount remaining)

• • Nothing bought during Week 3, anticipate buying 20" lazy susan ($58 on Amazon: https://www.amazon.com/Heavy-Duty-Aluminum-Turntable-Single-Row-Bearings/dp/B06ZXQNBLQ/ref=sr_1_3?s=kitchen&ie=UTF8&qid=1548897436&sr=1-3&keywords=20+inches)

Progress on Report and Webpage

• • Continue to update and edit report with data collected from sponsors

  • Add Applicable Standards section to the report by Friday 2/1.