156B Week 4

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

• • A drawing of the horns has been completed and will be sent to a manufacturer for fabrication.

  • A preliminary design for a pneumatic nesting mechanism is currently being generated.

Accomplishments from Previous Week

• • Purchased load cell, linear actuator for testing, springs, and power supply for linear actuator.

  • Completed "Applicable Standards" portion of final report. 

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

• • Recieve linear actuator and run tests to see whether nest mechanism is feasible. (Hugo)

  • Complete extensive research on pneumatics in case linear actuator concept fails. (Gerui)

  • Finish code to control linear actuator. (Matt)

  • Finish proof of concept presentation. (All members)

  • Complete first draft of report and webpage. (All members)

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

• • A sponsor meeting was not held this week.

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

• • A meeting with our instructor, Dr. Ghazinejad and our TA, Rishabh Khanna was held on 4/23/2020 via Zoom. The comments were:

• 1. If using a load cell, run tests multiple times and take average because load cells tend to give inaccurate readings.

  2. Switching to pneamatic mechanism would be a large shift therefore pneumatics should be researched in parallel with the current tasks concerning the linear actuator.

  3. To control pneumatic mechanism, an open loop system can be used to simplify the process. Implementing this system would require us to determine the desired length that the air cylinder shaft would have to travel in each heat stamping trial otherwise a closed loop system can be used but may be more complicated.

  4. The decision to use brass instead of copper should be considered due to the high pliability of copper.

  5. Run finite element analysis on copper horns and compare the von Mises stress of the part to the yield stress of copper. If the von Mises stress achieves half of yield stress of copper, it is advised not to use copper.

Risks and Areas of Concern

• A main area of concern is whether or not the purchased products will arrive in time. With the current pandemic, shipping has been delayed for most companies therefore the project must be scaled back to accomodate for this situation.

Schedule

• • The Gantt chart was last updated on 4/22/2020 and is currently up to date.

  • The upcoming goal set for 4/26/2020 is to implement the redesigned support frame (consisting of T-slots) into the main assembly.

Budget (list amount spent and amount remaining)

Remaining:

• • Equipment and parts: $1864.66

  • Machine shop expenses: $1500

Spent:

• • Equipment and parts: $135.34

  • Machine shop expenses: $0

Progress on Report and Webpage

• The webpage is up to date for the home, reports, team, and internal sections. The other sections are currently not applicable.

  • The following sections of the final written report have been completed:

  • title page

  • background

  • review of existing solutions

  • statement of requirements

  • deliverables

  • appendix with individual component analyses

  • impact on society

  • professional responsibility

  • applicable standards