156B Week 6

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

• • Assembly updated with additional 80/20 bar for support, acrylic and rubber/plastic covers for safety

  • Constant force spring and housing added to armrest assembly

Accomplishments from Previous Week

• • Parts for upper assembly structure ordered

  • COTS Sheet updated

  • Website updated to Draft 1 requirements

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

• • Finish purchasing parts

  • Build physical chair prototype

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

• • 5/6:

    • Order everything ASAP and begin building

    • Create complete BOM

    • *See "5/6 Sponsor and Delson Meeting"*

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

• • 5/6 (Delson/Steve):

    • Check in with companies to ensure parts are ordered and shipping

    • Look into guides for designing for kids

    • Add support to back of backrest mechanism -> added to assembly

    • Look into adding constant force spring or pneumatic piston to support armrest -> added constant force spring to assembly with housing

    • Look into adding dampening on forward motion of backrest, similar to boom mics

    • Work on updating website to draft 1 requirements

    • *See "5/6 Sponsor and Delson Meeting"*

  • 5/11 (Ian):

    • Wood is probably fine for panel and arm desk

    • Satisfied with 4-bar linkage for backrest adjustment

    • Look into working with Chris Cassidy for 3d printing

      • Printer can print in nylon and is more accurate

    • Concerns about footrest brackets

      • Unsure about attachment

      • Doesn't recommend 3d printing threads, use inserts melted into 3d printed material (contact Chris for more information)

    • Look into doing analysis on table to check for flexing

    • *See "Meeting w/ Ian 5/11/2020"*

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

• • none

Risks and Areas of Concern

• • safety

  • reliability

  • efficiency

  • CAD of office chair components

  • assembly

  • part ordering

Resources or Information Required but not Available

• • CAD/dimensions of office chair components

  • Tools for fabricating parts

Schedule

• • Week 7:

    • Work on fabrication/assembly

    • Order parts/tools

    • Create assembly instructions (if necessary)

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • $215.87 spent (main frame assembly parts)

  • $2252.65 remaining

Progress on Report and Webpage

• • Webpage updated 

Documents: