The ball machine is 3'5" (104cm) tall and 2'9" (84cm) wide. It has about 3,700 pieces, and would have had more aside from the fact that I almost ran out at the end. The machine has seven paths, which will (according to my custom) be dealt with in separate steps. I also used the Stepper Lift, and will be making instructions once I take the machine down, since there are none on Instructables already.
So sit back, relax, and enjoy watching...Retrograde!
Note: Retrograde refers to the term retrograde motion, which is the process that make the planets appear to circle back on their orbits through the sky. I thought the name appropriate, because a lot of the ball machine's elements use circular motion.
The music in the video is Chopin’s Fantasy-Impromptu for piano in C sharp minor, Op. 66, CT. 46 and Mazurka for piano No. 23 in D major, Op. 33-2, CT. 73.
Step 1: The Stepper Lift
Since I always build on a red rod support structure, this lift posed several design challenges. I had to get the lift to connect to the rest of the machine! I settled on the 4 grey rod height because 5 red rods is roughly the same as 3 1/2 grey rods...which was the height of one side of the lift. I simply put connecting rods across the gap.
The other problem was the width - the yellow rod lift would not match my red rod structure, either. I solved this dilemma by placing the lift at a 45o angle to the rest of the machine. In this position, it fit perfectly. I curved the entrance and exit paths and voila! I could defy gravity!
Note: My gate mechanism may be a little different from I_am_Canadian's...that was out of necessity. There weren't any really good pictures of it, so I improvised... :-D
knexpert#10829476 created a motor housing and posted a picture in the comments thread.