156B Week 6

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

• Design: We have had the first draft of the test chamber frame design. In addition, we are improving the gantry system design.

• Fabrication: We have purchased everything required to fabricate the sandwich panel for the test chamber. In addition, we have purchased the timing belts, the pulleys, and the fiber glass rails for the gantry system.

Accomplishments from Previous Week

• Han Cui: Finalized the test chamber frame design.

• Jiahao Fu: Determined the commercial pulleys for the gantry system and further machining. Studied the ''home position" mechanism.

• Yingqiao Jiang: Tested relays. Edited the design of gantry system.

• Yue Wen: Tested the new stepper motor and the driver. Edited the design of the gantry system based on the prototype results.

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

• Han Cui: Revise the test chamber design based on the comments received from the sponsor.

• Jiahao Fu: Machine the pulleys after receiving them. Finalize the ''home position'' mechanism and purchase needed parts for it.

• Yingqiao Jiang: Use temperature data from the sensor and a relay to control the cooler.

• Yue Wen: Build the new prototype for the gantry system. Coding for the positioning of the motor.

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (5/1 In Person)

• We can put I-beams under the base plate of the gantry system to reduce displacements.

• We need to make sure that the adhesive will not "attack" the components we need to bond together.

  • We will test the adhesive on a small pieces before using it to fabricate the sandwich panel. 

• The sponsor mentioned that it is important to keep the total weight of the device under 40 lb to prevent injury

  • We will try to further reduce the weight of the test chamber frame, as most of the weight is from the frame.

• The sponsor mentioned that we need to reduce friction in the gantry system.

  • We have changed the rails from Delrin rods to fiber glass rods. In addition, we are considering using Connex3 for the 3D printed parts.

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

• N/A

Comments from Other Students in the Class (4/29 Proof of Concept Presentation Feedback)

• "There are other parts which we which were unclear, we don't know any info about the project so pretend like we are dumb and present with that in mind."

• "More eye contact and less reading off of slides would be helpful."

• "Gantt chart is not placed in sequence of events. The blocks, or time duration, are scattered everywhere throughout and it may look better if they are arranged by date so the overall gantt chart appears to look like "descending stairs."

• "The oral presentation and the position of the students standing infant of the screen can be improved."

• "Some concepts are hard to follow, maybe simplify just for the sake of the presentation."

• "The Project management stage seemed limited."

• "A couple aspects of the design as the whole could have been explain a bit more, but this was only for one or two minor concepts."

Risks and Areas of Concern

• The sponsor is not satisfied with the total weight of the current design.

Resources or Information Required but not Available

• N/A

Schedule

Budget (list amount spent and amount remaining)

• Spent: $ 1162.62

• Remaining: $ 837.38

Progress on Report and Webpage

• Finished the first draft of the final report.

• Finished the first draft of the team webpage.