In machining, this term describes the total variation in the radial dimension of a rotating part as measured relative to a fixed axis of rotation. It represents the combined effect of eccentricity, out-of-roundness, and other imperfections that cause the part’s surface to deviate from a perfectly circular path. For example, a shaft with this deviation might wobble as it spins, indicating an uneven surface or misalignment.
Controlling this deviation is crucial for achieving proper fit and function of machined components. Excessive deviation can lead to vibrations, noise, premature wear, and even catastrophic failure in rotating machinery. Precision in manufacturing, particularly in industries like aerospace and automotive, relies heavily on minimizing this deviation. Historically, skilled machinists have employed various techniques to minimize this, laying the groundwork for modern measurement and control methods.
