Explanation of design and processing points that achieve both dimensional accuracy and strength of shafts.

Mating, coaxiality, and measures against thermal treatment distortion.

Shaft components are critical parts that perform important functions such as rotation axes and bearing fits, requiring a balance of dimensional accuracy and strength (durability). However, in actual field situations, issues can arise such as: - Fatigue failure due to fit variation - Eccentricity caused by poor coaxiality and runout - Bending due to heat treatment distortion - Stress concentration at steps and keyway areas This document organizes common challenges that occur in shaft processing and design, providing clear explanations on: - The relationship between dimensional accuracy and durability - Key points for setting CTQ (Critical To Quality) - Measurement items such as roundness, cylindricity, and coaxiality - Typical failure cases of shafts and their countermeasures Please use this as a reference when reviewing shaft design, processing, and quality management.

Processing Contract