Precision Custom CNC Turning Parts Manufacturing Services

Tolerances and Accuracy of CNC Turning

General Precision Grade

The tolerance range is typically between ±0.01mm and ±0.05mm, making it ideal for general mechanical components such as standard drive shafts and support bushings. These parts do not require high accuracy and can be easily achieved through CNC turning. They are commonly used in conjunction with structural components after Sheet Metal Bending and are widely applied across the general machinery industry.

Precision Grade

Tolerances can be tightly controlled within ±0.005mm to ±0.01mm, suitable for critical components in precision instruments and electronic equipment—such as sensor shafts and precision gear blanks. This level of machining demands high-precision tools and strict environmental control. These parts are often paired with those produced by high-precision CNC Milling to ensure overall equipment accuracy and performance.

Ultra High Precision Grade

Tolerances of ±0.001mm to ±0.005mm are employed for mission-critical components in advanced fields like aerospace and scientific research equipment. Achieving such extreme precision requires state-of-the-art CNC machinery, a strictly controlled environment with constant temperature and humidity, and advanced inspection techniques. In some cases, these components also require integration with Precision Laser Cutting for fine structural finishing and trimming.

Form & Position Tolerance Control

Beyond dimensional tolerances, CNC turning offers rigorous control over geometric characteristics including roundness, cylindricity, coaxiality, and other form and position tolerances. For example, the roundness of precision shaft components can be maintained within 0.002mm, while coaxiality is kept below 0.005mm. This ensures smooth operation and reliable performance post-assembly—equally critical to the flatness and perpendicularity control achieved through CNC milling.