I came across a description for a Kinetic Sculpture: "Sine Machine" on Instructables. This was just a proposal so I thought it would be fun to make a real-life version of this. I want to build a 10 foot wide version but first we must prototype!
I started by building a CAD model of the cam and follower in Inventor.
I exported the components and compiled them into a .DXF file to be cut by the laser cutter at the Milwaukee Makerspace. The cams have a center hole for the shaft and a second alignment hole. As you can see, the alignment holes are offset by 30 degrees to the previous one to form a wave pattern.
A healthy dose of laser cutter was applied to 5mm Underlayment from Homedepot. #8-32 threaded rod was used for the shaft. The washers used as spacers and to reduce friction ended up covering the alignment holes so I manually aligned the cams. I am glad I prototyped so I won't make this mistake the next time...hopefully.
I inserted some nylon bushings into a some plywood legs. The legs were glued to a plywood base.
And the .GIF of the mechanism in action. The cam profile is not a true sine wave and that be seen in the deflection profile.
If I keep moving forward with this project, the next version will be about 24 times larger!