Embedded Files
August 1st 2025 - Sep 2nd 2025
Objectives:
Design a car that is set into motion using only the power from a spinning flywheel
Flywheel must be spun by drill to get enough energy
A clutch must be used to smoothly transmit power to wheels
Car must have easy to use clutch activation method
Software and Parts Used:
Onshape CAD software was used to 3d model and Assemble the parts
3D printer used to make PLA and 95A TPU parts
Common Ball bearings were used to keep rotating friction to a minimum.
Rubber was used on rear wheels and clutch for high friction and good grip.
M4 bolts were used to fasten parts together
Spring was used to activate clutch
3/4" Steel balls were used in flywheel to increase rotational inertia
Results:
Final product has flywheel on sliding shaft so it can engage rubber clutch
3D printed belt is used to transmit power from clutch to axel (adjustable tensioner keeps belt tight)
gear teeth on flywheel to allow drill to transmit power
Rubber lined wheels grip ground and provide minimal slip upon starting
Pull tab attached to string allows for user to engage clutch from a distance
Problems (soon to be fixed with next iteration):
Belted drive train has high resistance
Keeping drill gear and flywheel gear together is hard due to large torque
Car veers right upon release (from gyroscopic effects)
Gear ratio is too high. A slower, longer lasting roll is more desired.
Flywheel bearings have to much resistance and 3D printed shaft causes imbalance
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