CNC machining precision typically ranges from 0.005mm to 0.01mm, depending on the machine tool type, control system, and process conditions. High-precision CNC machine tools (such as five-axis CNC machines) can even achieve repeatability of ±0.001mm. Key factors affecting precision include:
Machine tool rigidity: Cast iron bed (such as HT200-HT300 material) effectively reduces vibration and deformation, improving stability.
Control system: Closed-loop feedback systems are more precise than open-loop systems; for example, linear encoder compensation can reduce positioning errors.
Tooling and process: Carbide tools combined with Minimal Lubrication (MQL) technology can control surface roughness below Ra0.4μm.
Ambient temperature: A temperature-controlled workshop (20±1℃) avoids dimensional deviations caused by thermal deformation.
