156B Week 6

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

• • The hardware order placed to McMaster Carr is expected to arrive Monday or Tuesday.

  • Motor coupler, battery endcap chassis are fabricated and assembled.

  • The rangefinding sensor has been chosen and the waterproofing method of the sensor has been chosen.*

*The sensor model product page: http://www.maxbotix.com/Ultrasonic_Sensors/MB7367.htm

Accomplishments from Previous Week

• • Battery chassis is fabricated.

  • Mounting the winching system was discussed with SPAWAR. It was determined that it is best to proceed with the current design.

  • The sensor endcap has been redesigned to accomodate the Maxbotix rangefinder and a bulkhead connector.

  • The motor endcap was found not to require redesign.

  • Components in the final design are available in the parts section

  • Rangefinder order has been placed.

  • The first draft of the report is written. It is available in the "reports" section.

  • All sections of the webpage have been updated as much as possible.

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

• • Create techincal drawings of the endcaps. -Jebsen and Thomas

  • Create techincal drawings of the chassis components. -Johnathan and Merlin

  • Create techincal drawings of the level wind componenets. -Matt

  • Widen the inner surface of the PVC pipe. -Matt

  • Fabricate the motor endcap and sensor endcap out of delrin slug. -Thomas and Jebsen

  • Fabricate the motor endcap chassis. -Merlin

  • Cut the 80 tooth gear adapter on the LaserCamm. -Johnathan

  • Machine a tapped hole at the end of the steel shaft. -Matt

  • Fit the 3D printed parts together with gears and the steel shaft. -Matt

  • Layout the circuit for safely powering the Arduino, motor, and sensor with the batteries. -Merlin

  • Assemble the pressure case without electronic components. -Everyone

  • Test the pressure case for waterproofing at the Machine shop. -Everyone

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

• • We were given the rangedinder sensor model and a bulkhead style to work with. The sensor endcap has been redesigned to fit the chosen components.

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

• • Professor Tustaniwskyj told us to investigate methods by which the center of mass could be brought lower into the winch. Discussing with our sponsor, we find that the best method would be to add weights either to the outside of the pressure case or around the batteries if they can fit.

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

• • none.

Risks and Areas of Concern

• • There is a risk that the schedule 80 PVC pipe that we took from the machine shop may not be suitable for the pressure case housing. The inner diameter varies significantly.

Resources or Information Required but not Available

• • None.

Schedule

• • Assembly of the pressure case will occur this week and waterproof testing will occur this week.

Budget (list amount spent and amount remaining)

• • Amount spent: $649

  • Amount remaining: $1851

Progress on Report and Webpage

• • The first draft of the report is complete.

  • All the webpage sections have been updated.