156B Week 4

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

• • Major components designed and CAD created

    • Size reduced and design made more compact 

  • Ready to fabricate "wedding cake" structure

  • piston issue resolved.

  • Reconsidering Sparkfun board

Accomplishments from Previous Week

• • Designed and 3D printed battery enclosure

  • Designed piston-actuator connection

  • Decided to reuse Scripps dynamic o-ring piston structure (no need to design dynamic double o-ring seal again)

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

• • Assemble acrylic housing - Doris

  • Manufacture inner "wedding cake" structure - Duncan

  • Manufacture the piston - Zach

  • Decide on chip options and order - Hugo/Michael

  • Proof of concept experiments

    • Actuator force test - Zach/Duncan

    • O-ring test - Hugo

    • Waterproof housing pressure test - Doris

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

• • Reconsidered chip option, recommended Arduino Zero (4/25, person)

    • Arduino Zero researched as potential component

• Discussed piston placement and waterproofing (4/25, person)

  • Designed piston to press fit onto actuator, decided to repurpose the o-ring system from the old project for piston waterproofing 

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

• • Concerns about piston o-ring, suggested  (4/19, person)

    • Decided to adopt the o-ring system from the old design due to ease of implementation, proof of success, and affordability

  • Limiting the lateral motion of the piston (4/19, person)

    • Press fitting a specially designed piston to the actuator and securing with a bolt through the holes on the actuator

  • Allowing for slight adjustment of piston position to align with the hole in the housing (4/19, person)

    • Using slots or larger holes to attach the actuator to the "wedding cake" to allow for alignment, then lock down with washers

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

• • None

Risks and Areas of Concern

• •  Ordering problems - unable to process certain orders

    • Need to contact Scripps fiscal manager

    • Waiting on parts will limit time to spend on Proof of Concept presentation

    • 2 orders went through Roxanne but Ian brought up some concerns

  • Running behind schedule for Ghantt Chart

Resources or Information Required but not Available

• • Large number of our orders

Schedule

• • Testing water tight enclosure and ALL components on expedited schedule once they come in

  • Start coding once the controller comes in

  • Updated Gantt chart.

Budget (list amount spent and amount remaining)

• • Spent: $1,663

  • Remaining: $337

Progress on Report and Webpage

• • Completed Impact on Society portion 

  • organized website resources and files so they are in corresponding sections.