A pure mechanical rotating platform that does not require a power source, designed specifically for physics, chemistry, and biology experiments in middle and high schools. It is used to demonstrate concepts such as centrifugal force, conservation of angular momentum, and precipitation separation, and can also drive small generators or turntable experiments. Cast iron as a whole, low center of gravity, anti shake. Typical experiment: Quantitative measurement of centrifugal force speed relationship; Rapid stratification of red ink and water (visualization of sedimentation rate); Drive the small generator, light up the LED, and verify energy conversion; Variable radius counterweight experiment to verify the conservation of angular momentum.