156B Week 6

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

• • Proof of Concept Presentation this week

  • One axis of motion achieved using squiggle motors

  • Working on Mechanical Advantage solutions

  • Working on a 2X model

  • Ordering Stepper motors

Accomplishments from Previous Week

• • More prototypes created

  • One axis of motion using Squiggle motors achieved!!

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

• • Creating a 2X model for stepper motors (Sean)

  • Mechanical advantage ideas/prototyping (Razi and James)

  • Stepper motors and programming (Dylan)

  • Machining (Julie)

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

• • Sheet metal design:

    • There are no sliding surfaces because this design uses flexures.

  • New constraints:

    • Forget the 9 mm height requirement

    • New requirement for height is 18 mm

    • Focus on mechanical advantage

      • This might not be possible to implement, so at least make a CAD model

    • New foot print of 105 mm squared because there is an application for this size

      • If 10 mm is still an issue, move up to 15 mm

      • Current sensor should fit within there 10 mm walls

    • Possibly make a parallel device

    • Look into stepper motors

      • less expensive

      • less precise

      • closed loop

      • Arduino

      • Keith will send us links to possible motors

  • Goal: have 1 DOF working on the 52 mm squared serial design by next week.  With this design, do not worry about theta stage. Aperture can be made smaller in order to fit sensor within the walls.

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

• • For the report:

    • Double space the first draft

    • Single space the final report

  • We will be using spring steel for the flexures on the machined design

  • Mechanical advantage

    • The original goal of 3 lbs of mechanical advantage came from the SMA wire design

  • Things to do this week:

    • rewrite objectives

    • start playing with the squiggle motors this week!

    • get a microscope (use part number from Optimization Micro-Alignment Mechanism team)

  • Write up a plan of action

    • include all options

    • show how we can provide value to our sponsor

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

Comments from last in class presentation:

• • 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

• • Mechanical Advantage

    • how much and is this enough space?

  • Implementing stepper motors into a 2X model

Resources or Information Required but not Available

• • N/A

Schedule

• • Milestones:

    • Ordering squiggle motors

    • Coming up with a 2X design

    • Getting one axis of motion in the 52 mm footprint using Squiggle motors

Budget (list amount spent and amount remaining)

• • For a detailed account of the project budget see the "budget" section of the website.

Progress on Report and Webpage

• • The website is being constantly updated

  • The progress reports are being constantly updated