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2021-10-14 Meeting Minutes - Drivetrain

2021-10-14 Meeting Minutes - Drivetrain

Oct 14, 2021

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

Member

Update

Action Items

Member

Update

Action Items

@Former user (Deleted) (Chassis)



  • Discuss with Austin about mounting specifics

  • Implement review notes and finalize CAD details

  • Welded joint analysis (find out our options & maybe strength analysis)

@Former user (Deleted) (Wheel connections)





@Former user (Deleted)



  • Grab tire inner diameter dimensions

  • Grab FOB from Emily (or other)

  • Low priority: assemble wheel back on to rover

@Emily Adam (Deactivated) (Differential bar)

  • Read through literature

  • Order CF tubes this weekend! 

    • Want mass data too

  • Get Melvin and Cindy's approval of encoders, expose to motors

  • Review money and weight budget frfr

  • Follow-up with mentors

  • Discuss with Chan about CF characterization

@Former user (Deleted) (Frame/structure)





@Thomas Valer (Deactivated) 







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