2021-11-09 Meeting Minutes - Drivetrain Review w/ Ping

notes

Chassis

flip rocker and bogie end
take a look at the flexing of the top plate
- 10/15 kg arm on the plate may flex
- add some clamps onto the carbon fiber rods
carbon fiber
- make additional pieces to test and play around with
- bigger factor of safety for carbon fiber
- validate the carbon fiber
- bond strength between carbon fiber and aluminum is variable
- glass beads to fill the gap between epoxy and aluminum to prevent touching
- avoid carbon fiber touching aluminum
- strength testing on the instron on campus
  - google this to get some good data
  - bonding related to formula sae suspension arm
measure the carbon fiber tubes before manufacture
flip the bolt around in that block so it can be disassembled
chassis will react to the arm movement whole thing will wiggle with arm movement - be aware of that
pem nut some of the aluminum sheet metal parts - smaller detail
flanged hex blots to eliminate washers no need for socket heads - small detail
no issue boring that depth - boring bar, might not be able to bore in one go
do a circular cut out instead of a square slot
to get haas training you must go in with a CNC -reasonable part
need to refine some of the features
should add a step to make the expoxy joint concentric (see 4th link)
why have those plastic blocks - switch plastic to aluminum (make the block taller)

gap size depends on epoxy type - use
make the angle a whole number for ease of manufacture
spacer between bearings on the rocker arm - already on block
retaining compound for bearings
- internal retaining rings if the bonding doesnt work, block will have to get wider and add a groove
change the bracket to slightly cover the bearing.
DO NOT WANT EXPOSED BEARINGS
might be some slop in the bogie side
- shoulder bolt on either side instead if it fits
side to side bending concern on bogie side - especially in turning - more concerned with the bond strength of the tube though

tap the aluminum piece
main machine shop has all the tools
round out corners of the carbon fiber tubes where the round goes to flat - needs internal radius
try the wheel hub ASAP to see if it works
more internal radii for the 3D printed stuff - against this
beef up the thing alot
really need to try the 3d printed thing - highly suspect
might want to adapt the OG wheel hubs
round out the square holes

fixture jig

steel plate that you clamp to- super heavy super stiff
drill and ream holes in the steel plates and use shoulder bolts everything needs to be perfectly flat
glue thing together then bolt onto the fixture
you can make out of plywood too
- https://www.streetsource.com/threads/132294/ask-pro-loweer-control-arm-jigs-poics-please
  Control Arm Welding Fixture for Formula SAE Car | Portfolium

papers:

items:

ethan’s special message to us: