EV Motor Shaft: Precision Machining Challenges

Precision Challenges in EV Motor Shaft Manufacturing

The rapid growth of the electric vehicle market has created new demands for ultra-precision motor shafts that must meet stringent requirements for balance, surface finish, and dimensional accuracy.

Critical Requirements

• Runout: ?0.005mm TIR
• Surface finish: Ra 0.2 on bearing journals
• Balancing: G2.5 grade or better
• Material: 42CrMo4 or custom alloys

Machining Strategy

Our approach combines rough turning, stress relief, semi-finish grinding, and final plunge grinding with in-process gauging. The key is minimizing residual stress through proper heat treatment cycles between operations.