caption: Front Wheels - After the failure of the small front wheels during our beach test, we decided to rethink the front portion of the chassis by implementing the same wheels as used in the rear. Since the rear wheels worked so well during the beach test, we are hoping that adding the same wheels in the front would prevent the front from sinking into the sand, thus making the entire machine easier to push. However, having big wheels in the front might have made it difficult to turn, so instead of having the wheels fixed on the axle and having the axle spin in the mount, the wheels will spin on the axle and the axle will be fixed in the mount. This required a slight redesign of the wheel mount to fit the wheel axle instead of the bearing. In addition, we had to order bushings to fit the wheel axle. Since the inner diameter of the wheel was not a standard dimension, we decided to print adapters out of PLA to fit the bushing tightly into the wheel.
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