Conventional Tolerance Standards Dimensional Tolerance: ±0.05mm (General Precision); ±0.02mm (Precision Grade); ±0.01mm (Ultra-precision Grade, requiring special processes) Geometric Tolerance: Straightness ≤ 0.03mm/m, Parallelism ≤ 0.05mm Factors Affecting Precision Machine Tool Type (Vertical/Horizontal Machining Center), Tool Wear, Workpiece Clamping Method, Cooling System Configuration