156A Week 10

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

• • By the beginning of week 10:

    • CAD of first version design in all finished and discussed with the sponsor.

    • Few improvements needed to be applied to the previous design.

    • Begin prototyping.

Accomplishments from Previous Week

• • CAD of the first version of the design is finished.

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

• • Work on prototype and make tests on the prototype:

    • Shihao Xu: 3D print the transducer gate and install rubber o-ring. Use the transducer to test its water tightness.

    • Shengkai Peng: Build the initial version of the tank. Minimize friction. Build transducer support.

    • Quan Chen: Estimate the proper gear ratio and laser cut the gear.

    • Qiaosong Liu: 3D print the gantry beam and supports to see if the vertical position can be adjusted properly; also check if the hollow part in the beam can hold the LED stably.

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

• • The first version of design seems ok, but it is larger than needed (March 06):

    • We asked for the CAD files of the transducer and made measurements of transducer and LED device.

  • Performance of watertight at transducer gate is important, and the transducer should be able to slide inside transducer gate during the process of imaging(March 06):

    • We redesigned the transducer gate and will start prototyping to see the performance of water tightness of current design.

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

• • We are over-confident on our design in an aspect of manufacturability and water tightness (March 05):

    • We reconsidered our design of transducer gate and asked Tom (in machine shop) for help, and we redesign the transducer gate according to his advice.

    • We reconsidered our design of the drive train and come up with a new design with better manufacturability.

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

• • N/A

Risks and Areas of Concern

• • Performance of watertight is one of the most important risks that need to be tested by a prototype.

  • Drive train composed of gears needs to be tested to make sure it is functional. Otherwise, we need to change the design.

  • Rotational friction between tank and support table.

Resources or Information Required but not Available

• • CAD files of the transducer are needed from the sponsor.

Schedule

• • Finish prototyping by the end of week 10 (mainly 3-D printing)

  • Gantt Chart

Budget (list amount spent and amount remaining)

• • N/A

Progress on Report and Webpage

• • Webpage updated on March 10, 2019