156B Week 8

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

• • Redid CAD with better tolerances to allow for deformation of the plastic

    • Combined spring mounts with camera/latch mounts to minimize space needed

  • Updated report according to instructor feedback

  • Refined analysis of impact as a rigid body problem

  • Analyzed spring/damping coefficients of honeycomb Ninjaflex samples

    • Chose better sample, may print optimal one if time allows

    • Reach goal: come up with a list of optimal prints for each weight range

Accomplishments from Previous Week

• • CAD'd and printed all attachment points

    • found areas to be improved on while assembling parts

  • Printed less rigid Ninjaflex, optimal for lighter weights/lower impacts

  • Started on rigid body analysis

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

• • Print optimal honeycomb, compile spring/damping values (Andrew)

  • CAD attachment points for honeycomb alone (Zoe)

  • Refine report (Mark)

  • Finish rigid body analysis (Ang)

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

• • 5/18, in person

    • Make sure we document all of our designs, not only to show progress but also to help out future groups

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

• • 5/16, in person

  • Straight arm bar may be too low for user's comfort

    • Replace solid bar with angled pipe

  • Honeycomb is a good, more slim option than honeycomb+springs

    • Investigate honeycomb design further

  • Best way to thread 3D prints is with heated metal inserts

    • Investigate further for latch attachment point - would help strength of part as well

  • 5/16, email

  • Refine report

    • Clarify background

    • Narrow down requirements

    • Further discussion of safety requirements needed

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

• • 5/16, presentation feedback

    • More clear graphics in presentation would aid understanding

    • Need to do more in depth analysis of Ninjaflex

    • More details regarding dampers needed

Risks and Areas of Concern

• • N/A

Resources or Information Required but not Available

• • N/A

Schedule

• • Refine prototype, test second prototype

Budget (list amount spent and amount remaining)

• • Home Depot

    • 4x Copper Tube - $28.92

    • 2x Copper Elbows - $5.04

  • 3D printed Ninjaflex honeycomb part 1 inch - $18

Progress on Report and Webpage

• • Report updated in accordance with instructor comments

  • Webpage updated weekly as progress is made