156B Week 10

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

• • The acrylic tank was found to have one uneven edge that prevented it from fitting underneath the unit, but the edge has been sawed off and the tank can now be slid into place

  • Thicker mounting brackets have been 3D printed, and based on initial runs of the mister unit on the cart while in motion, are able to support the system even over sidewalk ledges.

  • The mister system is able to support the additional weight of a person's legs resting on top of the lid of the unit. Although, the legs were carefully placed on the unit.

  • The prototype design is mountable with functioning misters and fans, but the tank can only be filled to about 4.5 liters (1.2 gallons) - about 2 liters less than desired.

Accomplishments from Previous Week

• • Wires and tubes have been cut to more appropriate lengths and secured together with zip ties.

  • A fourth iteration of the mister fan casings have been 3D printed, and they contain reinforced  holes to be used to secure the fans and mister housings without snapping off as easily

  • A CAD design for a rotomoldable fan casing (fifth iteration) has also been made in which the thicknesses of each wall are uniform 

  • Time for assembly of the mister system has been recorded to be about 35 minutes 30 seconds with four people

  • The prototype system has been mounted on the Club Car golf cart and the misters and fans were used while the cart was in motion. (acrylic tank was not used since it was not cut to fit at this point)

    • The pump cycles were about 2 minutes apart

    • Produced mist was able to reach the driver with fan on while stationary (mist reaches driver's torso without fan while driving)

    • Driving over street curbs did not visible affect the misting system (we suspect that the water tank will leak since there is no space to implement a lid)

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

• • Finish the user's manual (pictures are being taken to demonstrate each step of assembly) (Oscar, Erasmo)

  • Final test runs of system with tank (Team)

  • Finalize CADs to be delivered (Cristobal, Chota)

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

• • Our sponsor was not available for our weekly meeting as he was out of the State on business during this past week

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

• • Molded components must be comprised of walls of the same thickness so that they cool at the same rate

  • The fan casings could be secured with fasteners/retaining clips along their circumference and inside securing holes instead of the extended guiding inserts we are currently using (meeting 5/30/17

    • A fifth design for the fan casings is being made which accounts for the uniform thickness of the walls, and we will recommend that screw inserts be used instead of threaded holes (we may not have that much time to do so ourselves)

  • It was recommended that the team fabricate a tool to pull the wires through the support beam for ease of assembly (5/30/17)

    • Such a tool was made with a wire coat hanger with a hoop at the ends, and it has been used successfully so far during re-wiring of the system

    • Wires have also been secured with ties

  • The lever toggle switches stick out and can be a hazard if the customer is not careful (5/30/17)

    • We have a rocker switch that can be recommended to our sponsor, but it is harder to reach than the lever switch when on the 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

• • While re-wiring the system (shortening the wires and tying them together) some wires were connected improperly and the full 48 V from the cart battery were fed to one of the fans. The fan was damaged and a replacement was needed. 

  • The team is considering using a water jug as a replacement for the acrylic tank if it appears to not hold the water well while the cart is in motion

  • The replacement and all other electrical components needed for filtering should be on by 6/5/17

Resources or Information Required but not Available

• • Pricing estimates of the molds are still an unknown

Schedule

Budget (list amount spent and amount remaining)

• • Budget limit: $1,800

  • Total spent: $496.15

  • Remaining: $1,303.85

Progress on Report and Webpage

• • Peer comments are being addressed first before the prototype performance section will be updated