pic: 716 Dual Motor/Dual Speed

[tkwetzel]

that silver square piece with the chamfered corners does the same thing as the Technokat's "dog", but it does it without requiring CNC machining
. Basically, the final 2 gears you see are rotating freely around the shaft, since they have bearings pressed into them. What happens is when that square piece is moved in one direction, or the other, it engages the gear by going into a square hole on them. Since the silver square is fixed onto the shaft, when it engages the gear, it causes that one to also be "fixed" and allow it to transfer power to the output shaft, rather than spinning freely on the shaft.

That's an interesting way of shifting. 116's gearbox has a gear specially made with a dog on it (use the lathe to cut down gear stock), but instead of a free spinning gear, the gear moves to engage other gears. Team 116's gearbox can be made without the use of a CNC, and this one looks the same way.