A kinetic sculpture inspired by Arthur Ganson's "Machine with 23 Scraps of Paper". This sculpture consists of 14 "scraps" of PLA, along with associated machination to make it all move.
The design is modular in that each individual bird, bird support, and base piece can be clipped together to form chains, or side-by-side configurations. Each row of birds has it's own motor and cams driven by a hex shaft. Remove-able clips connect each modular section, so they can be serviced if needed. For now the birds are glued to the support shaft, a future revision might see these removable as well.
See a video here: https://www.youtube.com/watch?v=Twi8_Yn4voE
Some assembly required.
"combined" parts sets can be used to print all the parts for the gearbox, support, wings, and extras at once. "assembly.skp" can be used as a reference for part assembly.
"assembly.skp" can be used as a reference for part assembly. Components are designed to be a press fit, and are therefore a tight fit. A small set of files, an x-acto, and a jewelry pin vise are recommended when assembling the components. Be sure to file any bridged portions of the print that come in contact with a bearing, as they tend to droop a little when printing and create friction on the bearing. While the parts fit tightly, the motion should be smooth or the 2-piece hex shaft couplers will pop off. This is by design to relieve stress if there is any binding on the hex shaft. If they do pop off, there is too much friction in the row of cams driven by the hex shafts and the bearing surfaces, vertical shafts, or bird joints need to be cleaned up. A hand crank is provided to turn the hex shaft without the motor to test the smoothness. This can be discarded afterwards. I recommend filing out all of the bearing surfaces, and applying a liberal amount of 3-in-1 oil to moving surfaces to get things moving freely. Also be sure to check for any binding in the metal tube vertical supports as cutting these or having a slight bend can produce quite a bit of resistance. Some parts are glued, mainly the wing support and wing coupler pieces. The metal tubing also may be glued to provide a more solid connection to the wheelcage and riser. Just a dab is all that is required. Be careful not to over do it and get glue on a moving part. Cyanoacrylate and insta-set is recommended. I usually use this stuff:
Components not printed were:
Bird shaft supports: K&S engineering 3/32" aluminum tube (#5101), 1/16" brass tube (#5125), 0.032" music wire (#5501), and 0.020" music wire (#5499) for the wings.
Motors are the common 30 RPM 6V variety found here. One motor per row of birds: http://www.amazon.com/gp/product/B009AQLDSS?psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00
Power supply used was a 5V 1Amp supply. Current draw of the entire sculpture, including LED's and motors, was 200ma.