by emmett, published
This started out as an exercise in using Greg Frost's awesome involute bevel gear script thingiverse.com/thing:3575, but turned into a rather pleasing worry-ball type thing. It's also clearly influenced by Greg's broken heart thingiverse.com/thing:4683, though this has octahedral gears rather than dodecahedral, so they all mesh with each other and spin. My favorite thing about it is that you can grab two opposite gears and twist them, making the center with the other six gears spin rapidly around.
Recent Commentsview all
We just put one of these together, and painted it. This is a delightful little gadget, thank you for posting it!
You should make little pieces that you can glue on the ends with the screws so that it looks like a full cube.... Or maybe i'll do it...
Liked Byview all
Give a Shout Out
Use a screw to tap threads into the center block first, because it makes it easier to assemble. No glue needed, the screws should stay tightly in the center block while the gears revolve. Attach the gears, making sure the edges of the cube connect them. If the gears are too tight to spin easily, just unscrew them all a millimeter or two.
The OpenSCAD file is highly parameterized to allow easy tweaking (for different proportions, screw sizes, etc.). You can also change the ratio of teeth on the gears, but you'll need to put the desired parameters into gearopt.m and run in Matlab (or Octave) and copy the result into the OpenSCAD file. This is necessary because I couldn't solve the geometry with anything but an iteration loop, which OpenSCAD doesn't handle so well. I used the MCAD library for Greg's involute gears github.com/elmom/MCAD.
You must be logged in to post a comment.