156B Week 7

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

• • 2X prototype is underway

  • Mechanical Advantage ideas are being created in CAD

  • Single axis movement with the 52 mm design has been achieved 

Accomplishments from Previous Week

• • Single axis movement with a squiggle motor has been achieved and confined to a nice setup

  • Successful proof of concept presentation

  • 2X model prototype printed

  • Stepper motors will be ordered tomorrow (JV was out on vacation...)

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

• • Get linear stepper motors (Team)

  • Work on programming with the new motors (Dylan & Sean)

  • Work on new iterations of the 2X model prototype

    • Improve design from lessons learned

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

Meeting on 5/7 at Delta Design

• • Machined part

    • ribbons don't fit

  • X prototype with squiggle motor

  • Budget still have about $2000

    • slides

    • squiggle

    • bearings

  • Stepper Motors

    • motor price sounds okay

    • controllers

    • shields - stack-able ($20)

      • best option

      • easiest to program

      • cheapest

    • buy 3 stepper motors

  • Email Keith about Fedex #

  • Keith will check on machine shop (time might be worse)

    • stick with UCSD machine shop

  • Jerry is set on mechanical advantage

    • research mechanical advantage

  • Setup meeting with Jerry

  • Get battery holder and mount everything for presentation

  • Linear stepper

    • Same encoder?

    • I2C Code

    • hall effect analog sensor Arduino

    • have to be closed loop

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 Proof of Concept Presentation (5/7)

• • Great job getting hardware to work

  • Since you are switching actuators:

    • Make sure you understand how the linear motion stepper motor works and explain it to me

    • Make a comparison of the two motors in terms of power density

  • I2C is possible , but it may be simpler to just use a 3 axis motor driver

  • Please present a number of concepts for mechanical advantage => what is your target mechanical advantage

  • For mechanical advantage, consider a ratchet system, also look into biologically inspired methods (look up how a flea jumps)

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

Comments from Proof of Concept Presentation (5/7)

• • Some compliments:

    • Good prototypes

    • Good job with the problem definition

    • Nice CAD, video, and pictures

    • Good progress and way to get a moving part

  • Some suggestions:

    • Have another video at a different angle or with better lighting.  Maybe point to the parts that are moving since our project is so small

    • Explain company's intention for having a 2X model.  Will be be downsized in the future?

    • Good luck on programming with I2C.  Talk to Steve Roberts on I2C programming

    • Pico-motors as a possible alternative to squiggle motors

    • Make sure that since you are splitting up the work to still communicate with each other

    • Utilize 3D printing.  What are you going to do for mechanical advantage?

Risks and Areas of Concern

• • I2C Programming

  • Fitting the linear stepper motors, encoder, and magnets into the 2X model

  • Working mechanical advantage into the 52 mm footprint

Resources or Information Required but not Available

• • N/a

Schedule

• • Milestones:

    • Get stepper motors and achieve movement with the 2X prototype

    • Further develop the mechanical advantage designs (52 mm footprint)

Budget (list amount spent and amount remaining)

• • For a detailed account of the project budget please 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