Millwright Level 1 Practice Exam 2026 - Free Millwright Practice Questions and Study Guide

The standard taper per foot for an arbor is typically in the range of 0.006 to 0.008 inches. This value represents the gradual decrease in diameter of the arbor, allowing it to fit snugly into corresponding components or fittings. A taper of this size ensures stability and alignment during operation, which is critical for maintaining the precision and safety of machinery.

The choice of this specific range is based on industry standards and practical applications where arbors are used, such as in milling or turning operations. This taper helps to facilitate easy insertion and removal while providing the necessary grip to prevent slippage during machining processes. Overall, understanding these measurements is essential for millwrights in order to select and maintain equipment effectively.