156B Week 4

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

• • Presented Updates and Progress to Sponsor

  • Looking into various displays and their accuracies/compatibility with our requirements

  • Researching on Secondary Deliverable

    • Creating a rudimentary DUT Design on CAD

Accomplishments from Previous Week

• • Finalized Load Cell

  • Created a list of possible Display Options

    • Compatible with the Finalized Load Cell Choice

    • Options of Handheld, Panel Mount, Laptop

  • Performed FEA of Base Plates

    • Used bottom face of S-Beam Load Cell as an Area for the Distributed Load

  • Created CAD of mount for various head sizes

  • Looked into various types of heaters for DUT

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

• • Sam

    • In contact with several vendors about display options

      • Considering Cost and Compatibility with Load Cell

    • Finalize Cartridge Heater Selection

  • Damon

    • Look into possible RTD's that would work with our requirements

  • Contact Steve Roberts

    • Ask about Electric Contacts and Circuitry behind the control of the RTD

  • Daniel

    • Look into ideas for DUT Mount

      • Material Selection

      • Insulting Washers to stop heat transfer from Screws

  • Richard

    • Mount Designs for Ease of Fabrication as well as user convenience

      • Perform CAD/Hand-drawn designs

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

• Not as Important to be thermally uniform, due to small size

  • Cartridge heaters would work

  • Mount

    • Dowel pins only used for alignment

    • Placed at incorrect location on current CAD design iteration

      • O-Rings are Seals

• Look into Captive Screws for ease of attaching fixture

  • Research into Ultem

    • Insulating Material

  • Voltages for DUT Component

    • Handler outputs 180V

    • Wall outputs 120V

      • Heater only needs to be 120V

  • Max heating temperature is 155 C

• Look into Resettable thermal fuses

  • Switches that doesn't turn the heater off when max temperature is reached, but rather regulates power

• No external cooling needed

  • Thermal Head on SLK performs this 

    • No need for -55 C temperatures for DUT

• Display

  • Hand Held Contained

    • No Laptop & No Panel Mount

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

• • Presentation Notes

    • FEA

      • Add a slide before the Analysis to show the objective of the FEA

      • CAD Images of component before FEA

    • Put FEA in Context

      • What do the stresses/deflection indicate?

      • Are the results what you expected?

      • Why do these stresses/deflection matter for the component?

• Why is the S-Beam Load Cell more Accurate than the Button Load Cell?

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

• • N/A (No presentation to the class this week)

Risks and Areas of Concern

• • DUT

    • Safety Risk

      • Incorporate a kill switch

    • Ensure mounting doesn't conduct heat generated from DUT

      • Don't let the SLK head heat up from generated heat

Resources or Information Required but not Available

• • N/A

Schedule

• • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • N/A

Progress on Report and Webpage

• • Updating Webpages

  • Drafting Report