Customizable coupling with a keyed shaft for fitting an M8 motor shaft into trolley wheel

thingiverse

This ingenious device functions as a coupling mechanism for securely fastening an M8 motor shaft to a trolley wheel featuring a precision-keyed internal shaft. A sturdy printed M12 nut then provides further stabilization by securely tightening its grip. To stay informed about the most recent updates, visit https://github.com/hyperair/motor-wheel-coupling. The project relies heavily on https://github.com/hyperair/MCAD. 2014/08/17: Engineers took proactive steps to improve functionality, modifying the motor shaft hole's design by introducing a flat section instead of an entirely cylindrical structure. This clever innovation helps distribute weight more evenly across the entire shaft, effectively mitigating the strain placed on both the setscrew and joint between wheel and collar. Steps To Follow To initiate assembly, carefully measure your trolley wheel dimensions alongside the motor shaft dimensions and choose the ideal nut or setscrew size for the project at hand. Once you have confirmed that all necessary settings in the .scad file are correct, proceed to export a .stl model before slicing it with an optimal 20% density and honeycomb infill configuration (as I discovered through extensive experimentation). Adjust your extrusion width to 0.6mm while maintaining a 0.1mm layer height – omitting any requirement for support material will greatly simplify the process. To complete assembly, follow these simple steps: Push an appropriately-sized nut into its corresponding slot within the collar. Gently slide the collar onto the motor shaft while aligning the screw hole with the newly-arranged flat portion (present if your motor features it). Choose between employing a regular M3 or a more versatile setscrew to secure the connection in place, defaulting on M3 for convenience. Fit the wheel securely onto its companion coupling. Once this assembly has been achieved, proceed to apply gentle pressure and twist until an M12 nut snugly engages with the threaded component that extends beyond the perimeter of your 3D-printed assembly (possible difficulty initially mitigated by applying periodic, steady pressure – thus reducing any wear on threading as you coaxively force-finish it into final securement position).