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Precision machining with CNC and VMC systems requires accurate setups, but challenges such as tool deflection, machine misalignment, chatter, and feed rate miscalculations can occur. These problems lead to increased scrap, downtime, and inconsistent part quality. Material-specific issues, thermal expansion, and insufficient operator training also contribute to machining errors. Solutions involve regular calibration, proper tool selection, optimized machining strategies, and thorough process planning. This description covers the main challenges faced in CNC/VMC operations and offers practical ways to enhance repeatability, surface finish, and machining efficiency.