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#010

Movement No. 10 is a direct modification and refinement of Movement No. 9 — the classic Variable Speed Cone Pulley system — but with a critically important difference: the pulleys are no longer simple straight-sided cones, but instead feature curved, nonlinear profiles. In Movement No. 9, two opposing conical pulleys with linear (straight) tapers are connected by a belt that can be shifted along their length to vary the output speed. While elegant in concept, straight-sided cone pulleys have a geometric limitation: as the belt shifts to different positions along the cone, the rate of speed change is not uniform — and importantly, the belt tends to twist and run unevenly because the linear cone geometry does not perfectly satisfy the geometric condition that the belt must always travel in a single plane. Movement No. 10 addresses this fundamental limitation by replacing the straight cone profiles with carefully calculated curved profiles — typically following a mathematical curve such that at every belt position along the pulley pair, the sum of the effective radii of the two pulleys remains exactly constant. This constant-sum condition ensures that the belt always runs at the same total length, maintaining consistent tension regardless of the belt's position, and that the belt lies in a true plane at all times, eliminating the twisting tendency. The result is a smoother, more mechanically correct, and more reliable continuously variable transmission than the straight-cone version of No. 9. This principle of nonlinear pulley profiling directly informs the design of modern CVT (continuously variable transmission) systems used in automobiles, motorcycles, and industrial machinery. ━━━━━━━━━━━━━━━━━━━━━━━━ 📚 BROWSE ALL 507 MECHANISMS 🔗 https://mech.formline3d.com New mechanism every day. ━━━━━━━━━━━━━━━━━━━━━━━━ 3D visualization of mechanism from the classic engineering reference "Five Hundred and Seven Mechanical Movements" by Henry T. Brown. About this Project: I am recreating all 507 mechanical movements in high-quality 3D animations. This library serves as a visual guide for engineers, students, designers, and hobbyists to understand kinematics and mechanical design. Support the Library: If you find these visualizations helpful, please subscribe to follow the progress as I complete all 507 movements. #MechanicalMovements #Engineering #Mechanism #Kinematics #IndustrialDesign #507Movements