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Originally Posted by tkwetzel
Very nice indeed. Looks similar to 116's gearbox, except yours is a bit more compact. How does the shifter work, it is unclear in the picture. Your mount for the drill motor is nice, looks pretty sturdy.
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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.
Cory