156B Week 5

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

• • Cart design has returned to a 30" diameter, maximizing the number of components held and washed. 

  • Tested arrangement can hold around 20 lids or wire bars per tier (components separated by tier).

  • Components are to be separated using galvanized cables tied through each level.

  • Each basket will be held up by 4 support poles at their outer diameter which can be stacked onto each other using a bung system.

  •  After testing, we confirmed that slowing down the rotation speed allows for components to clean well, even with slight nesting of components

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• Above is an image of a new tested prototype with gloves tied to the bottom to provide friction and slightly slow rotation. Wire bars, which did not clean well previously, reached acceptable levels of cleaning from riboflavin testing.

  • Components are still separated with twine as cable will be a more permanent solution that we will use after finalizing how components are arranged.

Accomplishments from Previous Week

• • Further polished cart design (02/03)

    • Cart is now stackable through a bung system in the outer support rods

    • Cart is back to a 30" diameter to increase number of components held

    • Components will be separated using galvanized cable set up in each level

  • Part procurement (02/04)

    • Went to Marshalls and IMS to purchase aluminum rods and cables for cart fabrication

    • Looked into options such as steel grating or self-manufactured aluminum sheets for basket

      • Decided on ordering baskets we found online rather than manufacturing a basket ourselves.

  • Prototype Testing (02/01)

    • Team went to CAEP to do more riboflavin testing and further test for an ideal arrangement of components

    • Found that the spin is necessary for a thorough clean with our design

    • Lids clean well even when slightly nested, wire bars did not clean.

      • (02/06) Tested wire bars again with different angle orientation in the cart as well as with a slower rotational velocity

      • We found that components were cleaned thoroughly with slower spin speeds.

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

• • Find a method of slowing down rotational velocity of cart in wash (Kelli)

  • CAD final cart design concept and obtain dimensions for machining (Yuji)

  • Machine already purchased support  rod materials and bung materials for fabrication (Jonathan)

  • Research part options and order un-purchased components for fabrication (Annie)

  • Complete fabricating a tier of our final design concept (All)

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

• • Our Sponsors are prioritizing quantity of components washed rather than the compactness of the cart (02/01)

    • Having the cart fit into vivarium rooms is not a top priority

  • Sponsors are interested in using stainless for the cart prototype .

    • After discussing the price differences and material benefits with our sponsors, we decided to move forward with aluminum for our prototype due to its inexpensiveness.

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

• • Try to use materials that are available for purchase rather than personally manufacture parts (01/31).

    • After searches online, we purchased baskets to be used rather than fabricating our own (02/04)

      • See: https://www.storesupply.com/pc-14100-1206-wire-basket-topper-for-round-racks-60124.aspx?from=details&fbclid=IwAR2j2rjZCG3HozjM0KPbSUkCM8SUYWaqBYb7slDM5gBgtzvYum4l1VKi_Ww 

    • Rods and cables were purchased at Marshalls and IMS (02/04).

  • If possible, reduce number of support bars from 4 to 3 (01/31)

    • We are still moving forward with the 4 bar design for both simplicity and to keep the footprint of car within the dimensions of the wrapping machine platform (02/04).

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

• • How can we keep the footprint of the cart within the wrapping machine platform (22inx22in)?

    • How can we maintain stability of the cart while staying within this footprint?

  • How can we make component arrangement intuitive for technicians use?

  • How will we slow down the spin speed of the whole cart?

Resources or Information Required but not Available

• • Where can we obtain "centripetal brakes" and how do they function?

Schedule

• • Weekly meeting with sponsor to present our new cart design present testing results (02/08)

  • Begin machining parts for tier one of final cart prototype (02/06-07)

Budget (list amount spent and amount remaining)

• • Purchases made haven't been reimbursed yet:

    • Aluminum rods (IMS): $21 + $42.59 +$27.69

    • Small aluminum rod: $13.13

    • Galvanized cable: $5

    • Crimping tool for cable: $42.59

    • Wire baskets (2):$100

  • Amount Spent: $287.44

  • Remaining: $1712.56

Progress on Report and Webpage

• • Report is being updated with design changes and sponsor feedback

  • Rough draft to be ready by end of this week