156B Week 7

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

• • 3 dof test stand awaiting tape to attach hall effect sensors

  • deliverable CAD design underway

  • Researching sensors and components for deliverable stage

  • Altering code and circuits for switch to Arduino Due (from Uno)

Accomplishments from Previous Week

• • Parts for 3dof prototype ordered, some arrived

  • CAD of deliverable has began

  • Discovered need to switch flexures due to results of spring analysis

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

• • Finalize CAD of deliverable (Carl  & Ben)

  • First draft of PCB to be approved by sponsor (Kyle & ?)

  • Component selection for PCB electronics (Eder)

  • Bias springs selected for final design (Chad)

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

• • Sponsor prefers using a 'shelf' for stage to 'rest' on in case of flexure overloading instead of greater FOS by thicker SMA wires

  • Comments on CAD

    • Adjustable SMA tension

    • Maximum flexure exposed

    • Consider set screws for flexure mounting instead of clamp

  • PCB is a MUST for deliverable

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

• • Need better presentation or more effective communication. Use clear color coded diagrams and clearly label all components. Need to have better description of motivation for project and overall objectives. Make clear what deliverable will be presented.

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

• • haven't received comments from presentation yet. 

Risks and Areas of Concern

• • PCB & machining stage have long lead time, any design changes after parts are made could compromise schedule

  • Worried about CNC capabilities regarding time constraints, tolerances, tapping holes, and milling features. 

Resources or Information Required but not Available

• • None currently.

Schedule

• • CAD for deliverable finalized by Fri Wk 7

    • Show to sponsor & machine shop for critique by Saturday Wk 7

    • Start machining early wk 8

  • PCB for deliverable designed by Mon Wk 8

  • Order PCB Parts by Mon Wk 8

Budget (list amount spent and amount remaining)

• • $207.51 spent, $2,292.49 remaining

Progress on Report and Webpage

• • Updated multimedia section with video. animations, diagrams, and images.