156B Week 4

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

• • Squiggle motors and bearings have been ordered

    • They should be arriving this week

  • Tom is in the process of machining one of the flexure designs

  • Possible new design breakthrough (ask Razi about the concept)

    • Optimization of the current flexure design

Accomplishments from Previous Week

• • Successful design proposal presentation

  • Plan of Action created

    • See attached sheet

  • Parts and Squiggle motors were ordered

  • More CAD models were created

  • Brainstorming for theta stage underway 

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

• • CAD models for new flexure design (Razi & James)

  • Squiggle motor mounting (James & Dylan)

  • Theta stage creation (Razi & Sean)

  • Complete First Draft of the Report by early next week (Team)

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

• • Pursue the option with the least cost

    • Flexures are hard to beat cost wise

  • The sensor is placed 0.28 mm away from the motor

  • Presentation

    • Change cost

    • Change lifetime of flexures - flexures might actually last longer

  • How to attach the motor? Use a clamp?

  • Do not mention the circuit board design in the presentation

  • Do not mention passing current through the flexures

  • Change theta to +/- 0.5 degrees and +/- 0.5 mm

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

• • Comments from Doctor Delson on our presentation:

    • Excellent early CAD and delivery

    • I did not understand L flexure design and parallel mechanism approach

      • are motors mounted to stationary base?

      • Is there sliding between squiggle motors?

    • What about material choice of flexure?

      • Discuss

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

• • Things our peers liked in the presentation:

    • our prototypes

    • they thought we did a much better job with our problem description

    • they enjoyed/appreciated the comparison tables

  • Questions our peers had:

    • What does 22 million cycles convert into (# of days)?

    • Is there a requirement on how many motors we can use?

  • Suggestions our peers had:

    • The use of flexures is a good idea.

    • Using a pivot bearing for the theta stage

*Important to note: Some of our peers liked the serial concept with the linear slides but as a group we feel we can no longer go in that direction.

Risks and Areas of Concern

• • Flexure design

    • Attaching flexures

  • Attaching squiggle motors

  • Intricacies of positioning the sensors

  • Squiggle motor cost (long term/64 array cost)

Resources or Information Required but not Available

• • N/A

Schedule

• • Milestones:

    • New flexure design

    • Experiment with Squiggle motors

    • Mounting Squiggle motors

Budget (list amount spent and amount remaining)

• • See Budget section of the website for an updated project budget

Progress on Report and Webpage

• • Progress are being updated

  • The website is being updated

  • First draft of the report will be worked on in the near future