These 3D parts are used to build a Scotch Yoke linear driven Magnetic Repulsion Piston that can be used to generate electricity. The brass tube is 1/2 inch in diameter and can hold 1/2 inch diameter N50 grade neodymium magnets. The brass tube is 3.2 inches long.
The slot in the Scotch Yoke was designed to accept a 1/4 inch diameter pin.
The Linear Piston Drive Wheel was designed to give 2 inches of linear travel when connected to the Scotch Yoke.
The shaft diameter is 1/4 inch for both the central drive shaft and scotch yoke pin.
These 3D parts were designed using the Freeware Version of the EMachineShop software package.