[Dan] had a bunch of concrete mixing to do. Sure, it was possible to stand there and mix concrete and water in a wheelbarrow for hours and hours but that sounds like a tedious task. Instead, [Dan] looked around the shop to see if he had parts available to make a concrete mixer. As you may have guessed, he did. Instead of stopping at just a concrete mixer, he decided to make a concrete mixing wheelbarrow!
The frame is built out of plywood left over from a past canoe project. The frame holds a mixing barrel that was also hanging around the shop. From the photo, the drive system looks simple but it is not. First, the small motor pulley spins a larger pulley that is in-line with the barrel. Gearing down the drive this way increases torque available to spin the barrel, and that gear reduction is necessary to spin the heavy concrete slowly. What you can’t see is a planetary gear system that gears down the drive train again. The gears are cut out of plywood and were designed in this Gear Generator program. The sun (center) gear of the planetary setup is supported by another scavenged part, a wheel bearing from a Chevy minivan.
Now [Dan] can mix all the concrete he wants, wheel it over and dump it wherever he needs it. With the exception of the drive belt and some miscellaneous hardware, all the parts were recycled.
For those unfamiliar with it, Bocce Ball is an outdoor game played with a set of heavy grapefruit-sized balls. We’ve never really thought of making our own set, but as you can see above, it can be done. These are six Bocce balls produced at home by [Horvitz444].
It seems the commercially available balls have a cement or clay core covered in a layer of high-impact epoxy. [Horvitz444] was able to recreate this starting with some vacuum forming. He built his own former out of peg board and a shop vac. The plastic stock he used was a light panel from the home store. After heating it up in the oven he formed a mold using what looks like two halves of Bocce balls. The mold halves were melted together using a soldering iron. After pouring in the secret concoction of cement ingredients and letting them harden, he removed the orbs from the molds and ground down the seams until smooth. They were covered in epoxy and painted. Most of these details were gleaned from his comments in the Reddit thread.
[Guus] sent in his project where he put a radio inside of a rock. He started with a 1970’s car stereo and encapsulated it in cement by wrapping it in duct tape, building a wooden form around it, and pouring in the wet cement. Three ports are included on the back for power, antennae, and speaker. He included an outline of how he did this but we’d love to hear some tips on how he made it look like a rock and not just a brick of concrete.