Kinetic sculpture

I wanted to make something with gears for the first time. I also find scotch yokes pleasing to my eyes. So I made this useless machine, not completely useless as it works and impossible for me to walk past it without stopping to turn the crank. But doesn't do anything beyond make me smile like a dork.

Video of it in action:

To make one of these you'll need:

4x 18" steel rod a hair between 4-5mm in diameter
15x 4mm x 30mm bolts, washers and nylock nuts.
1x 18"x18" of plywood, wood or laun. I used luan as it was cheap and had a nice finish.
5mm or equivalent-ish drill bit and drill
super glue

For printing, I used ABS but I can't see why PLA or other blends wouldn't work just as well. Unless noted, most parts don't require printing with supports:

4x wedge2
1x gear_handle
1x gear_idle
1x gear_south
1x gear_north
1x gear_east
1x gear_west
1x gear_main
2x log_rodholder
2x log_scotch_yoke (use supports)
2x lat_scotch_yoke (use supports)
2x lat_rodholder

Assembly:
Pretty easy build, take your pllywood and draw a line down the middle in both the X and the Y axis. Attach the gear_main in the center. Line up the gear_east, gear_west, gear_north, gear_south to their corresponding cardinal directions and the 'handles' of those gears should be positioned where they are the closest they can be to the center of gear_main. The axel holes of each gear should fall on the X/Y line you've drawn on the board. The lat_ and log_ rodholders correspond to latitude and longitude directions, as do the lat_ and log_ yokes. The rodholders are of different heights as one axis goes under the other. Run the rods through the yokes but leave them a loose fit at first to make sure they are sliding freely along their rods, yokes don't get hung up on screw heads etc. May have to raise the rod holders with some washers if your bolt heads sit too proud. The gear_idle and gear_handle can be placed a bit more freestyle. Just mate the idle gear to the main gear, drill and attach. Followed by the gear_handle. Once you have everything moving smoothly (don't tighten any bolts too much!) you can use super glue to attach the rods to the rodholders. Finally you add the wedge2 pieces to the holes in the yokes.

Update:
Needed an excuse to experiment with my printers settings and decided to print out these peices at 50% of their original size. Works great, would recommend setting your printer speed pretty low and print with cooling on (even with ABS). Another treat for doing it at 50% smaller is that you can affix the gears to a board with tiny nails. For the rods i used floral wire at first and then upgraded to clothes-hanger wire. Works really well and makes for a good desk toy.