2021-10-14 Meeting Minutes - Drivetrain

Goals

• Get initial feedback on first draft CADs

CAD Spins

Chassis

Notes:

• Current mass: 7.5 kg
• Consider where to switch to a clamping mount around the CF tube instead of adhesive bonding
• Consider where to bond to the outside of the tube VS the inside
  • Fear of inner mounts puncturing CF tube (i.e. at base of vertical CF stand)
• Simplify mounting blocks to require less complex boring
• Look for OTS clamp for rocker beam
• Believe we're okay without a cross beam → aluminum surface plates should increase stiffness and resist torsional loads
• Consider Gimbal routing low priority 
• Going forward with CF chassis...if we hit a dead end, can swap to aluminum extrusion

Suspension/Legs

Notes:

• Current mass: 1.1 kg
• Don't use bolts for alignment, use just for clamping. Use steps and dowel holes to align critical pieces
  • Consider reamer sizes for fits needed VS boring bar
• Move the bogie in-line with the rocker
  • Upper rocker acts as a hardstop
  • Consider stiffening bogie joint structure → make more like a clevis pin where you have one solid structure
• Add differential mounting
  • Vertically down from the rocker pivot point
• Using bearings on all joints instead of bushing as they are better at handling loads

Wheel connections

Notes:

• Consider taking off NEMA plate on motor
  • Download the actual motor CAD lmao
• Want to get ID of tire without hub

Differential bar

Notes:

• Look into more adjustable eye joint linkage configurations
• Use heat-sink inserts

Update & Action Items

• Everyone work through feedback
• Everyone ISO limits and fits
• Everyone CAD naming organization scheme

Other Notes

• Welded joints analysis → Andrew
• Rotational ability on CF beam, if we want to use for rocker beam
  • Could add a steel sleeve to integrate into bushing? More work?
• Review limits and fits (ISO), CAD naming scheme
• Future of Automotive Body & Chassis, Steering, Suspension & Braking seminar, ~45 minute digital meeting