The ConsuLab EM-200-28 is designed to help demonstrate and simplify the complex acceleration and deceleration phenomenon that occurs in revolving universal joints and drive shafts operating at various angles. Even when the input driveshaft rotates at constant speed, the output driveshaft maintains a variable speed depending on the angle between them, which causes vibrations and wear over time. The higher the angle between the shafts, the more amplified the effect is.