Archive for the ‘Uncategorized’ Category
I’ve been working on combining a vacuum former and a CNC. The goal is that the machine can mill the buck, form the plastic shell, and then mill the shell — all in one. The hope is that some interesting parts can be created with the machine.
I’m still in early stages and the rig is basically a Frankenstein build of various kits, but I think it’s starting to go somewhere.
My latest tin can toy is based on Galactus. The main feature are the antennas on the side of the helmet. And the parts that connect the antenna fins to the head turned out to be the trickiest pieces. I made a jig for the mill so I could slot the aluminum. Then I turned them to the correct size on the lathe.
Finally got my 4 bar linkage “Block Pusher” proof of concept working.
Linkages are hard. I think they are powerful mechanisms, I just find them difficult to visualize and time consuming to iterate. I’ve been thinking about a device that could turn and push a small wooden block over and over again, and I fear a four bar linkage may be the answer.
I saw a great video from Disney Research on creating animated mechanical characters. Their software appears to be proprietary, but it was a great starting point. Then I found an incredibly useful 4 bar linkage simulator from Mechanical Expressions. Thanks to this simulator, I quickly dialed in the desired motion and got my linkage dimensions.
Drew up some designs.
And milled some parts.
The first prototype is a hand cranked 4 bar linkage built from aluminum and delrin parts. Linkages need to be built well in order to operate correctly. There can’t be too much slop in the mechanism and precision counts. Hopefully, the second prototype will actually move a block around.
Almost done. I’ve been working on a game controller for the 9 year old daughter of a friend of mine. She programmed a donut video game in Scratch. You press the “B” key and the background changes. The “D” the donut flavor changes. “S” for sprinkles. “F” for frosting.
The game is awesome and so is she. Hope she likes it.