Hand wheels are circular manual controls used to adjust machinery. They operate through a simple rotation mechanism that can precisely control the movement of a machine component, usually along a threaded spindle or shaft. The user turns the hand wheel, and the attached mechanism translates this rotary motion into a linear or rotary output, depending on the application. They are commonly found on industrial machines like lathes, milling machines, grinders, and valves in systems controlling fluids. The design of a hand wheel can vary from solid disks to spoked wheels, often with a handle to enhance grip and turning leverage. This enables operators to make fine adjustments with relative ease and precision, facilitating better control over machine operations. Hand wheels embody the concept of mechanical advantage, providing an ergonomic and effective means of manual control in various mechanical and industrial settings. Designs include spoked or dished with a central mounting hole which is either pilot, round, square or keywayed to mount it to the application.