156B Week 5

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

• • Overall Frame redesign

    • Acrylic spines added to sides

    • Rails moved closer together to make room for spines

    • Moving block was raised so it can travel freely above ground

  • Linear Actuator Resolution Verification

    • Tested Arduino code to step motor, verified motor step size/resolution

Accomplishments from Previous Week

• • Received all parts except shaft collars and secondary motor driver

• Verify components' size according to CAD model and manufacturer specs

• Built acrylic test frame for resolution verification

  • Received aluminum stock from Tom

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

• • Finalize CAD Design - All

    • Determine fastning method of actuator mount and moving block

    • Confirm grip design can meet all specs and be insulated from the sample

  • Machine motor mount, stationary block, moving block, and grips - All

    • Bring drawings to Tom at start of the week to determine best practices for machining

  • Verify resolution of potentiometer - All

    • Use test frame and arduino ADC shield, along with "map" function to produce potentiometer output in micrometers

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

• • Sample alignment is user's responsibility, so should not be a major concern in load frame design (4/20, in person)

    • Continued with previous grip design with sponsor's approval

  • Samples must be electrically insulated from the frame

    • Redesigned grips with space along back wall to add insulating material

  • Grips must be able to accomodate samples up to 2mm in thickness

    • Continued with previous grip design, as it accommodated higher thicknesses

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

• • Attach allen key or socket wrench to load frame so it isn't lost (4/20, in person)

  • Use a hard durometer rubber for grip surfacing (4/20, in person)

    • Ordered rubber samples from Rubbercal.com

  • Press-fit and Insulate shoulder screws used in grips (4/20, in person)

    • Design has been updated to reflect this

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

• • N/A

Risks and Areas of Concern

• • Attaching linear actuator to moving block, while keeping the tapped and clearance holes aligned for mounting

Resources or Information Required but not Available

• • N/A

Schedule

• • Have all parts machined by end of week 6

  • Have load frame assembled by end of week 7

  • Have closed-loop control by end of week 8

Budget (list amount spent and amount remaining)

• • $580.22 spent

  • $919.78 remaining

Progress on Report and Webpage

• • Updated progress reports, gantt chart, budget

  • Added "Impact on Society" section to report