• Spoke to Mark from Machine shop
  • Suggested Laser cutting to save money and time
  • Machining pieces would take roughly 1 week
• Meeting with Professor Kenning
  • Suggested making another prototype before machining final design
    • Test out new changes
  • Mentioned that creating a stand for wheel instead of using bike was okay
    • Since the main project is the CVT gear design, this setup would still highlight that design
  • Requested updates to make sure we stay on schedule

Finished:

• CAD
• Found Gear sizes

To Do List:

• BOM
• DigiKey order
• Belt order
  • Find required belt specifications
• Submit work order
  • Waiting on response from machine shop

Continuing on CAD

• Holes for mounting on cog coincide with previously made slots
  • Need to make adjustments
• Continuing with general fixes for bike mounting

• 

• 

Took apart freewheel

• 

• 

• 

Taking apart the freewheel allows us to reuse parts instead of machining a new freewheel/mount for the gear mechanisms to attach to the shaft

• Need to make CAD changes to mount mechanism to cogs

Decided to bolt front and back plates of gear mechanism together

• Maintains constant axis of rotation for both plates
• Will require more bolts

Continued on CAD

• Gear mechanism needs to be bigger than expected
  • Will reduce desired supported gear ratio range
• Added slot on gear mechanism to account for power transfer protrusion on wheel shaft

Continued working on taking apart freewheel

• Made some progress
• Pieces seem to be turning

Continued trying to take apart freewheel

• Doesn’t seem to budge
• May need to machine custom freewheel

Continued working on CAD

Planning

• E5 Machine shop
  • Return borrowed tools
  • Got a few leads for potential machine shops to outsource the machining parts
• UW Bike Shop
  • We asked about taking apart freewheel
    • Needed to ease the attachment of our gear mechanism onto ratcheting mechanism
  • They advised that it would be extremely hard
  • Suggested buying freewheel or buying new wheels instead
• E3 Machine Shop
  • Told us they would be able to machine parts if given CAD drawings
    • Suggested to look into aluminum instead of steel as it would be easier to machine, cheaper, lighter and won’t rust
      • Need to check material properties and strength requirements
    • Need to email CAD drawings and fill out work order
  • Suggested that the freewheel may be reverse threaded and to try rotating it clockwise