3D printed truck

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The high cost of good RC truck kits, diminishing need for such kits & the noise of gearboxes made me look elsewhere for a robot platform.  3D printing a truck from scratch, with only a few metal parts still being off the shelf, was the next step.  The only parts which have to be outsourced are the motors, steering servo, & steering knuckles.  Everything else is 3D printed or home made electronicals.  The size was based on the original Tamiya lunchbox.

 

 

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The remote control is a single paw 3 channel, with 100mW radio, ball point pen springs, hall effect sensors.

 

 

 

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The remote control is charged inductively.

 

 

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Motors are direct drive Propdrive 4248's of any KV rewound with 20 turns of 26AWG.   They don't produce enough torque to go up hills.  The motor sensor is a dual hall effect sensor resolver.  

The main problem is cooling the motors while getting more torque.  Metal motor mounts of the right shape continue to be cost prohibitive & PLA doesn't dissipate heat.

 

 

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Electronicals automate just enough to drive it with 1 paw, but not so much that it's never finished.

 

 

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Traction & steering are 2 separate modules.  Steering uses a brushless servo with stock lunchbox servo saver.

 

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Motors are powered by L6234's mounted dead bug style to get the heat out.

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Tires are printed out of TPU in varying shapes to adjust hardness & traction.

 

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Rear tires have a flat wide shape for more forwards traction.  Front tires have a round shape for more sideways traction.

 

 

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The battery is completely enclosed.

 

 

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