Coaxial shaft

Coaxial shaft assembly is not independent model it is part of future robot design but is stored independently on Thingiverse. Purpose of this design is to integrate two coaxial independently powered shafts in one mechanism. For example: One drive wheel second drive fliper. This is first prototype.

BOM

COTS:
JGA25-371 - 25 mm diameter motor with gearbox and encoder
10x15x4 6700 bearing
20x27x4 6704 bearing

key printed parts
M1 16z 30deg bevel gear
M1 40z 60deg bevel gear

STL export

resolution: 1 um

Resolution setup in FreeCAD:

1. Switch to Mesh Design bench
2. Go to Edit > Preferences > Import-Export > Mesh Formats
3. Set Maximum mesh deviation 1 um

Slicer setup

Slicer: Slic3rPE-1.41.0+win64-full-201809010758

Print settings: 0.15mm OPTIMAL MK3
Filament: Prusa PLA
Printer: Original Prusa i3 MK3

Changes from default settings:

• Print Settings
  • Layers and perimeters
    • Seam position: Random
  • Infill
    • Fill density: Shafts & Rings 40% Gears 20 %
    • Fill pattern: Honeycomb

g-codes

g-codes generated for MK3 and MK2.5
Shafts printed independently
All sleeves and rings for both shafts
Gears for both shafts