The differential on Sawppy is different from the differential in an automotive drivetrain. Instead of distributing different forces across different drive wheels, this differential distributes suspension forces across the two sides. It is a key part of how the rocker-bogie suspension keeps all six wheels on the ground.
CAD source Differential with brackets to mount to body in Body Box Mounts
3D Printing STL Files:
- DiffBrace.stl * 2
- DiffEnd.stl * 2 (Mirror one of them)
- DiffLink.stl * 2
- DiffLower.stl * 1
- DiffUpper.stl * 1
- Rod Support.stl * 2
3D Printing Notes:
- The differential brace is a large part that needs to be rotated 45 degrees in order to fit on a 200mm x 200mm print bed.
- Aside from the differential brace, everything else can be printed together.
Post-Processing:
The most dimension-critical part is the differential link. It needs to grab onto the 8mm shaft used as differential rod via set screws. It also needs M3 threads to connect (via a turnbuckle) to the suspension rocker arm.
Use 8mm reamer to ensure good fit on 8mm rod used for differential rod.
The pair of rod supports also need 8mm reamer cleanup.
The lower differential part needs four M3 thread heat set inserts. The upper and lower parts also each get a bearing.
