156B Week 8

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

• • A preliminary mister fan casing has been 3D printed and initial problems, such as the strength of the guiding flanges and the spacing of fan and mister while inside, have been noted

  • Toggle switch boxes have been cut out of acrylic and glued together with access openings for them to slide into the mounting bars

  • An acrylic tank has been assembled out of acrylic pieces, but it still needs to be sealed to prevent water from leaking 

Accomplishments from Previous Week

• • Tubing and associated clamps have been replaced with reinforced rubber tubes and spring clamps (hose clamp pliers were used to fasten these clamps)

  • The prototype components that comprise the main body of the misting system have been machined and assembled with minor adjustments, such as sealing the tank, needed.

  • As stated above, a second mister fan casing has been modeled based on issues that were observed from the first model and are currently being printed 

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

• • Seal the acrylic tank with fish-tank adhesive to allow it to retain water(ordered by Chota)

  • feed tubes and electrical wires through the aluminum bars and connect them to their appropriate components; also create the necessary access holes on the bar for said wires and tubes (Cristobal, Chota, with help from the rest of the team)

  • Screw/fasten all components into the acrylic and 3D printed system (team) 

  • mount the system onto the Club Car cart by deciding to either use the existing mount brackets or creating a pair of prototype brackets (Erasmo, Oscar, with help from the rest of the team)

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

• • The mister fan could be fastened with a hexagonal nut that is sunk into the roto-molded model and fastened with a threaded rod, essentially creating a clamp (meeting 5/20/17)

    • The prototype casings currently use two 8-32 screws to hold its two halves together with one side being threaded and the other having a clearance hole. The roto-molded products could be made with the hexagonal sinks and full clearance holes, which will avoid complicating the fabrication by having threaded holes. 

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

• • The water tank may be constructed from polycarbonate, PVC sheets, or acrylic (instructor meeting 5/15/17) 

    • The tank has been formed out of acrylic bonded by acrylic cement and an additional sealant will be applied once that arrives

  •  Mold will likely form in the tank and periodic cleaning should be considered (5/15/17)

    • The stainless steel mister heads must be cleaned periodically with cleaning vinegar already, so the maintenance personnel can be advised to clean the tank in conjunction with them 

  • spring clamps and automotive tubes are more reliable in the long-term and should be implemented even at early stages of design (5/15/17)

    • The system is now equipped with these recommended components and no leaks have been detected while water runs through the system. 

  • The team should provide an estimate on assembly time so that the expenses of having manufacturing companies mount the system can be estimated (5/15/17)

    • This can be measured while connecting the electrical components together in the misting system

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

• • NA

Risks and Areas of Concern

• • The price of the spring clamps and reinforced tubing may be unappealing in the short-term

Resources or Information Required but not Available

Schedule

Budget (list amount spent and amount remaining)

• • Budget Limit: $1,800

  • Amount spent as of 5/21/17: $368.69

  • Amount Remaining: $1,431.31

Progress on Report and Webpage

• • Secondary revisions have been made and new component have been added. The team is identifying further mistakes that have or will be revised.