Simple Mechanisms:
* Crank and slider: A crank arm rotates, connected to a slider rod that moves linearly. The slider rod can then be used to drive another mechanism.
* Rack and pinion: A linear rack engages with a rotating pinion gear, converting linear motion of the rack into circular motion of the pinion.
* Screw: A rotating screw drives a nut linearly, or a rotating nut drives a screw linearly.
More Complex Systems:
* Lead screw: Similar to a screw, but with a more precise and higher-quality thread. This is often used in precision applications.
* Cam and follower: A rotating cam with a specific profile forces a follower to move linearly, which can then be converted to circular motion.
* Scotch yoke: A slider constrained to linear motion by a yoke drives a rotating shaft.
* Geneva drive: A slotted wheel rotates intermittently, driving a pin on the other side of the slot to rotate a second wheel.
Beyond Mechanical:
* Electric motor: A motor uses electromagnetic forces to convert electrical energy into rotational motion. While not directly converting linear motion, it effectively achieves circular motion.
The choice of device depends on the specific application, the desired speed, torque, precision, and other factors.
