156B Week 6

What has been done in the past week

• Finished rough draft of report

• 2D moment demonstration tool

  • Painted for better visibility

  • Added pipe cleaners for force and position vector

• Truss design challenge

  • Brainstormed different ideas for connections

    • Analyzed pros/cons of different ideas

    • Cost estimate for 3D printed hub

• Finished designing center of mass challenge shapes

• Finalizing the production of the Hyatt Regency models

Feedback from meeting with sponsor

Reaction Box

• Wants hinge that doesn’t stop linear sliding

  • Can make one instead of buying one

  • Doesn’t need to be apart of the box

COM Challenge

• Lasercut wood?

• Materials that are able to be lasercut:

  • https://wiki.atxhs.org/wiki/Laser_Cutter_Materials#:~:text=The%20laser%20can%20cut%20or,stone%2C%20tile%2C%20and%20glass

  • Thickest is 1/2inch

• Konex printer is too expensive and time consuming

Truss Challenge

• Lasercut foam core / dense foam

• It’s okay if there’s discrepancy between the calculations and actual implementation

  • e.g: if it breaks at the joints

• Can try 3D printing just to test it out

• Good to at least try different materials out

3D Moment about a Point

• Wants spring at the wall

• Mount flange onto a spring

• It’s okay if this isn’t a priority / doesn’t get done

Buckling demo tool

• Different cross sections

• 10:1 ratio

• Brainstorm materials

  • Flexible filament? Ninjaflex

Ball with string

• To show normal and tangential acceleration

• Smaller than a tennis ball

• Secure so that it doesn’t fly away

• Can buy one

  • Send link to Qi for purchasing instead of coming out of our budget

Presentation

• When kit is finished, we want to focus our presentation on the kit as a whole instead of individual components

• Give a pitch (like Sharktank)

• “Why do you want this expansion pack”

What is the next step of your project

• Reprint Hyatt Regency walkway pieces

  • Once done, send Hyatt Regency to machine shop to glue nuts to threaded rod

• Finalize solidworks shape designs and send files for 3D printing

  • Decide if any shapes can be made out of a different material, present to Tom/Chris tomorrow

    • wood

    • Ask about other 3D printer

• Reaction box --print supports and cut new lid

  • Adding in carrying strap, 1 more bearing, 1 regular hinge, ball and fixed joint

• Finalize vector box design

  • Start buying materials on Thursday 2/11

• 2D moment demo tool

  • Connecting string to rigid body (need to order)

  • Stand for the pegboard (ordering / manufacturing)

• Truss Challenge

  • Testing new materials for the joint connections

  • 3D printing supports

  • Narrowing down specifics of the design challenge (cost, environmental score, design space, etc)

  • Creating a draft of the assignment