A handwheel is a circular device used to manually control machinery or equipment. It typically consists of a wheel attached to a shaft, allowing users to turn it to adjust settings or move components. Handwheels are commonly found in various applications, including lathes, valves, and cranes, where precise control is necessary. These wheels are designed for easy gripping and turning, often featuring a textured surface for better traction. Handwheels can vary in size and material, depending on their specific use. They are essential for tasks that require fine adjustments, making them a vital component in many mechanical systems.