156B Week 4

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

• • Prototype fabrication and testing

Accomplishments from Previous Week

• • Finalized machine dimensions to order all the parts (Alec, Seb)

  • Ordered parts for the assembly (ALL)

  • Prototyped circuit to control grinder motor with Arduino (Seb)

  • test 1/2'' and 1/4'' tubing and create more detailed CAD (Alec)

  • Created system control flowchart (Alec)

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

• • Take apart kettle, look into level sensors, figure out kettle shut off (Phil)

  • prototype QD, mesh prototype (Alec)

  • Get grinder working with Arduino/ explore new screw mechanism design (Sebastian)

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

• • All comments made in person on Thursday 1/24/2019

  • kettle needs to be titled slightly to drip all the water

  • figure out when kettle switches off

  • don't worry about stratification

  • thermocouple to track temperature of water/buy thermocouple

  • go with the switching power supply/order this week (instead of the AC "wall wart" power supplies)

  • reiumburesment dicussion

  • block diagram/stagger grinding and heating

  • discuss level sensors to detect water level

  • buy 8020 frame

  • discussed QD and tube diameter

  • discussed 3dp alterante solution

  • call on saturday to finalize BOM

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

• • Individual power supplies vs. step down transformers

  • Temperature constraint of the pump

  • Particles getting into the pump (goes thru the pump and out)

  • Temperature stratification

  • adjusting pump power as water level decreases

  • running the pump super hot (testing in extreme environment aka hot water)

  • High Temperature o-rings

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

• • Need to find 3d printing material that can withstand high temperature and is food safe

  • Non-self priming pump leaves excess coffee in tubing

Resources or Information Required but not Available

• • Need to find high temperature, high volume, self priming pump

Schedule

• • Upcoming milestones (due Friday):

    • Heat water to 205 °F

    • Pump heated water into brewing chamber

    • Grind and dispense coffee grounds

    • Functional system power supply

  • Next milestones (due 1/4)

    • Assemble prototype frame (aluminum extrusion)

    • Integrate functioning subsystems

Budget (list amount spent and amount remaining)

• • Spent: $416.85

  • Remaining: $3,083.15

Progress on Report and Webpage

• • Impact on society, done

  • Team page in progress