Ways to go about making a mechanism to lift then rapidly drop a small box lid?
I'm looking to build a sound installation that uses the sound of a sheet metal box lid slamming. The box would probably be approx. 6" x 6" x 12". I'd be willing to make it slightly larger. I'd like to have a mechanism inside the box that lifts the lid, then rapidly drops it, either pulling it shut or dropping out of the way. I'm sure a mechanism like this exists somewhere in the instructables for other objects but I'm not sure where to look! Any assistance would be very helpful!