Originally posted by Roland
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Here is a very crude (sorry) drawing of what a single tooth looks like, in respect to the shaft it lives on, which is fixated (pounded into with a sledge hammer) in the drum. Each tooth has a corresponding cavity that provides enough room for the simply constructed tooth (pipe welded to a triangle of steel) to free and completely revolve in, spinning around the shaft. As the drum picks up speed, the teeth revolve freely on their own. The main shaft spins at 2100 RPM and weigh over a tonne. Each tooth weighs about 8-10lbs.
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