156B Week 6

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

• • CAD drawings for nutating frame and gyrowheel have been created

  • CAD drawings for rest of assembly will be created this week

  • need to order bearings for support

  • assembled nutating frame to gyrowheel

  • ordered 80/20 for precessing frame

  • the wrong tripod for the base was delivered so there will be a delay on that while we wait for the correct to arrive

Accomplishments from Previous Week

• • Proof of Concept Presentation

  • ordered 80/20 and started assembling precessing frame

  • created CAD drawings for nutating frame and gyrowheel

  • assembled nutating frame to gyrowheel

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

• • assemble precessing frame

  • assemble the base and the support, and hopefully the entire gyroscope

  • test out magnets to reduce friction of spinning parts

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

• • 5/1/18 - Prasad says a motor is not a high priority, however having functional sensors is

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

• • comments from 5/2/18:

    • Motor:

      • Select 2 or 3 different ways of transferring torque from the wheel

      • Transfer plate

      • Brakes with disc to transfer torque

      • Flexible shaft coupling to power torque in line

      • Could attach belt and mount motor from the side

      • How much time do we want it to take to get up to speed?

      • Most of the time have gearbox attached to motor

      • Calculate kinetic energy of gyrowheel at full speed, calculate how many seconds to come up to speed and that is how much energy you need to put in from the motor

        • Maximum power output is in the middle? And multiply by some factor of safety

      • Choose the motor based on how much power you need

      • Choose the gearbox using your simulation

      • Pololu

  • actions take - probably won't actually use a motor

    • List:

      • 80/20 aluminum/t-bar on Mcmaster Carr; Frameworld

      • More detailed list; sublist for each part

      • One person dedicated to designing gyrowheel, one person dedicated to different parts

      • Choose some encoders so they can be integrated into the CAD

      • Need to design and build the frame

      • Try to make a more detailed CAD and if we get stuck then we can talk to James on Friday

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 lot of friction in the spinning parts and we are not sure how to reduce it

  • connecting the base support might be difficult because of how thin the 80/20 aluminum is

Resources or Information Required but not Available

• • none

Schedule

• • Describe upcoming milestone

    • complete gyroscope by end of the week

    • Proof of Concept Presentation

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • we are waiting on the exact amount from Cheryle

  • last week we spent 43 + 63.65 + 56.68 + 95.48 + 37.1 + 57.16 = $353.07

  • brings our total to approximately $853.07

Progress on Report and Webpage

• • completed rough draft of report and webpage