This mechanism uses a spherical groove and a constrained follower ball to create a guided three-dimensional motion. As the ball moves within the curved channel, it forces the attached arm to tilt and rotate along a predefined spatial path, producing smooth, predictable articulation without complex linkage geometry.

Components — White spherical groove frame, red follower ball, yellow guiding arm, green mounting bracket, sliding base, and the circular support plate.

How it works — The red ball rides inside the white spherical groove, and the yellow arm holds the ball captive while allowing it to roll freely. As the arm is moved or pushed, the ball follows the groove¡¯s curvature, causing the arm to tilt, swivel, and rotate in response to the changing geometry. Because the groove is shaped like a segment of a sphere, the motion stays naturally constrained to that surface, creating a clean, coordinated spatial movement from a single sliding contact.

Applications — Camera gimbals, ergonomic controls, motion-guided hinges, compact robotic joints, and mechanisms needing controlled multi-axis tilt without large linkages.

Why it matters — The spherical coulisse design allows complex spatial guidance with just a groove and a follower, avoiding the weight and friction of multi-bar linkages. Its simple structure gives precise, fluid movement ideal for compact devices where smooth articulation is essential.