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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 drive shafts and support bushings. These parts do not require high precision and can be reliably produced using CNC turning—often used in conjunction with sheet metal bent structural parts. This level of accuracy is well-suited for the general machinery industry, where consistent performance and cost-effectiveness are key.

Precision Grade

Tolerances can be tightly controlled within ±0.005mm to ±0.01mm, suitable for critical components in precision instruments and electronic devices—such as sensor shafts and precision gear blanks. Achieving this grade demands high-precision tools, strict environmental controls (e.g., temperature and humidity), and integration with high-precision CNC Milling parts to ensure overall system accuracy.

Ultra High Precision Grade

Tolerances from ±0.001mm to ±0.005mm are applied to mission-critical components in advanced sectors like aerospace and scientific research equipment. Such precision requires state-of-the-art CNC machines, a highly stable environment (constant temperature and humidity), and advanced metrology techniques. In some cases, parts may also undergo Precision Laser Cutting for fine finishing and structural refinement.

Form & Position Tolerance Control

In addition to dimensional tolerances, CNC turning provides rigorous control over geometric characteristics such as roundness, cylindricity, and coaxiality. For example, precision shafts can achieve roundness within 0.002mm and coaxiality under 0.005mm—ensuring smooth assembly and reliable operation. This level of form and position control is equally important as flatness and perpendicularity control achieved through CNC milling.