156B Week 3

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

• • Two prototype designs under consideration: spring steel vs. timing belt driven (or hybrid of the two?)

    • Calculations and decisions still pending

  • Testing rig designs still in progress

Accomplishments from Previous Week

• • Preliminary CAD models of spring steel and timing belt protos

  • Design proposal presentation

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

• • More calculations for timing belt drive (Mike and Tai)

  • Methods of machining spring steel into springs/flexures (Sean and Alex)

  • Calculations for spring steel drive (SolidWorks analysis?) (Sean and Alex)

  • Ordering parts for testing rig; ordering sets of parts for parallel prototype design? (Steven)

  • Begin work on Proof of Concept presentation (all members)

  • Complete design for heat/cold test rig; complete design for cycle testing rig (Steven and Tai)

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

• • Meeting with Ernest (Jan. 17th)

    • Extending pucks to full .5" (or just under) width will NOT interfere with shuttle plate that carries our prototype; it will only help the heat path! 

    • Positions of pucks almost entirely unchangeable

    • Puck sizes may vary; some test devices are huge, and a 4x puck proto would be necessary (we're only going to focus on the 8x puck proto)

    • If we're going the route of using springs to provide the restoring rotation, the pneumatics CAN be left on during testing; this is just a matter of programming in the MATRiX

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

• • Meeting with Professor Tustaniwskyj (Jan. 15th)

  • Vetoed to the purely pneumatic design: don't redesign pneumatic piston-chamber 

  • Suggested spring steel ribbon to wrap around pucks with a spring on the other side to rotate back

  • Basically eliminate any sliding motions (that would produce friction and wear)

Risks and Areas of Concern

• • Will timing belt show wear?

  • Are spring steel flexures feasible?

    • Do they need to be longer than we have space for?

    • Will they fatigue too quickly?

Resources or Information Required but not Available

• • How to perform flexing calculations on spring steel bends?

Schedule

• • Describe upcoming milestone

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • none spent

Progress on Report and Webpage

• • Progress reports accessible on external page

  • CAD model pictures available in CAD section