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A stepper motor might do the trick, but it needs to be able to overcome the initial amount of force that will start the can cruching. If you used a stepper motor in conjunction with a small gearbox, then it should work. Or you could just have more awesome stepper motors than I'm used to working with.

So, just watched the episode of the show with the automatic can crusher and came up with a good way to make it work. Not sure how the math works out, but I remember getting a lot of torque out of re-purposed drill motor assemblies the last time I needed to build something like this. So what think you?