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From the if-you-are-going-to-hit-yourself-with-a-hammer dept...
...use a small hammer.
By this I mean, that I think this is a pretty bad idea for lots of reasons... ...but if you are going to do it, do it as close to the motor as you can.
I have actually seen something like this used on some small toy transmissions. They did not have a linear engagement, but an arc one.
Essentially, an idler gear was mounted on an arm that pivoted about the motor's output gear. This arm's movement would engage gear A or gear B depending on the rotational direction of the motor. It worked for the toy.
I would not like to trust my robot's ability to move on such an idea, but to each his/her own.
Joe J.
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