Ideal Harmonic Transformer

thingiverse

This was initially an "Analog Sine/Cosine Calculating Machine" project but it has a new name that I prefer. It's a unique device to hold, turn its crank and admire. If you need to find the sine or cosine of an angle quickly without a calculator, this machine can help. The Scotch Yokes on the device work in reverse too. After completing one, I plan to paint it, hang it on my wall, and use it to teach trigonometry to my children. Initially, the design was supposed to be simple for learning Alibre but became more complex over time. I even considered adding a paper feed and pencil holder for plotting purposes. Two prototype versions with mechanical details can be seen in photos, which you can read about along with notes on making my own printed screws at http://swampcastle.blogspot.com/2011/06/sincos-prototypes.html. Other related articles about this project are also available on my blog at http://swampcastle.blogspot.com/. Assembly instructions can be found at http://swampcastle.blogspot.com/2011/06/analog-sincosine-machine-assembly.html and the parts can be found at http://www.shapeways.com/shops/swampcastle in various materials. The stl files contain different print quantities depending on their file names. An alternate one-piece version of the yoke is also available, eliminating the need for glue but requiring a large printer. Alibre design files are included in http://www.swampways.com/alibre_designs.zip. Printing the device requires a T15 Torx screwdriver and glue. On an Up! printer, all bolts and pins need to be printed with fill=solid and quality=fine for sufficient torsional strength while other components can be printed with default settings of fill=loose and quality=normal. File updates include higher resolution versions of all files, Alibre design files, stronger fasteners, and a one-piece yoke option.