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CNC Machining Tolerances

Achievable precision in CNC machining operations

Standard Tolerances by Process

Process	Standard Tolerance	Precision Tolerance
3-Axis Milling	±0.1 mm	±0.025 mm
5-Axis Milling	±0.08 mm	±0.02 mm
Turning	±0.05 mm	±0.01 mm
Grinding	±0.01 mm	±0.002 mm

Factors Affecting Tolerance

Machine condition and calibration
Tool deflection and wear
Material thermal expansion
Workholding rigidity
Operator skill