156B Week 6

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

• Created few iterations of Force Measurement Mount Adapter with correct alignments

  • Talked with sponsor about pricing of components and places for fabrication

    • Display Panel, Adapter Fabrication, etc.

• Performed heat analysis on DUT mount to show SLK doesn't get heated with DUT

  • Presented in Proof of Concept Presentation

  • Ultem Fabrication Procedures

Accomplishments from Previous Week

• • Presented Proof Of Concept Presentation

  • Performed Heat Analysis on DUT Adapter

    • Compatible with the Finalized Load Cell Choice

    • Used bottom heating block as heat source at steady state temperature

  • Looked into the electrical circuit behind controlling the DUT and RTD

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

• • Sam

    • Cartridge Heater Update for Rate of Heating Requirements

    • Look into PLCs vs Temperature Controllers

  • Damon

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

    • Research about which microcontroller and MOSFET would suit our needs

    • Work on the electric circuit design

  • Work on DUT Circuit

  • Daniel

    • Improve DUT Adapter

      • Making it less material for better heat transfer

        • Increase rate of heating by stripping unnecessary material

    • Look into tolerances for Cartridge Heater

  • Richard

    • Improve force fixture adapter design

      • Considering the slots and holes

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

• Clarifications

  • At a certain temperature, can you provide a certain DUT power.

    • Ex: SLK=10W; DUT = 100W?

  • Output both heater wattage and temperature

• RTV can be used for RTD mounting

  • Near leads, so they don't get damaged

  • Unnecessary for heater, as heater leads aren't as fragile

• Thermal Conductivity for AOS Heat Sink Compound is much less than that of Copper's

  • This is to take place of air, which has an even lower thermal conductivity

• One 250W heater should be enough, regardless of heating time

  • 1.5 inches in length for heater

• Look into captive screws for adapter mounting to SLK

• Base plate doesn't need a surface finish

  • Usually already measured to 1 micron

  • Surface finish important for the DUT tool to ensure even contact to SLK thermal head 

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

• • Ask Sponsor few questions:

    • Maximum wattage of computer chip?

    • Do we need to reach 155 C while SLK cools chip?

    • Regarding heat distribution hotspots & uniformity

• Include a rough estimate of the eclipse machine cost in presentation for context

• Omega - PLC

  • High current & Control Heaters

    • 1000W Output?

• Effects of Heat on hole sizes and thermal expansion on thermal grease

• Ask Team 2 for how they are controlling temperatures

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

• • N/A (No presentation 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