Tooth loads produce axial thrust. Crossed helical gears are helical gears that mesh together on non-parallel axes. Straight bevel gears have teeth that are radial toward the apex and are of conical ...

There is scarcely a mechanical combination of any kind into which toothed or gear whecls ... then the teeth are placed at a suitable angle with the shaft, and are called bevel wheels.

An EV3-controlled motor powers the whole thing. He also makes use of an obscure part–the 14-tooth bevel gear, last manufactured by LEGO in 2002 and even then it was mostly sold in part ...