Wooden percussion elements
Rocker elementThe rocker element is a sort of see-saw that throws marbles up in the air.
Marbles are dropped on the left side of the rocker element. The marble then rolls to the right side. When the next marble is dropped on the left side, the impact catapults the marble on the right side off the rocker.
The rocker paddle is screwed loosely into the base. The piece should be able to tip towards the right side a bit, but not too far to the left. If it can tilt too far to the left, marbles might not roll to the right. Note that the slope of the floor of the machine puts the whole element at an incline, so marbles will roll to the right even if the rocking piece is level with the top or inclined slightly to the left.
Clacking boxThe clacking box is designed to make a loud clack when a marble falls onto it.
Now gluing the halves together. I smoothed the bandsaw-cut joint surfaces with a belt sander. Also note that I haven't cut the pieces to length yet. I trim the length after gluing the halves together. That makes sure both pieces are flush with each other, just like I did with the rocker element (sorry, I neglected to take a photo of that step)
The clacking box is just slightly higher where the top attaches. So to cut the rest of it lower, I'm passing it over the table saw. I didn't bother to peel off the template because this step cuts away most of it.
Although I used a paper template for the top, it's actually easier to cut it on the table saw than the bandsaw. The paper template is still useful to make sure I have the size right, and for cutting the corner radiuses on the bandsaw afterwards.
Doing a quick sound check of the clacking box, comparing it to the one for my first marble machine 2. I originally cut the top to be 5 mm thick, but the sound wasn't as good as the old one, so I cut it down to 3 mm. I changed the plans to 3 mm.
Back to Marble machine 2.1