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Giant Marble Run

For the 2008 Trunk-or-Treat I built an 8-feet tall marble run.  Only it used pool balls instead of marbles.

Sadly, the marble run didn't survive my engagement, marriage, and subsequent two moves.  This is the best picture I have.  The balls started on the wavy slide at the top, dropping into a weighted swing-arm at the top right.  The swing-arm rotated counter-clockwise about 90 degrees, depositing the ball onto the first of two ramps.  Hidden behind my backpack is a piece of dryer duct that redirects onto the second ramp.  The second ramp also has a spinner activated when the ball passes.  At the end of the second ramp, another piece of dryer duct redirects the ball onto a "staircase" -- a series of plastic tubs, each with a hole in one end.  When the ball falls through the hole in one tub, it lands in another tub.  The last tub deposits the ball in a wavy (side-to-side) track (not shown), after which the balls end up in a cool-whip tub for easy retrieval.

Update: My friend-and-fellow-engineer Eric took a couple of pics: