When sourcing machinery, buyers must prioritize mechanical precision, motor efficiency, and structural durability. Key indicators include the spindle speed, torque ratings, and positioning accuracy (typically within ±0.01mm for CNC equipment). Ensure the machine uses high-quality components from reputable brands (e.g., Siemens PLC, Schneider electrics) to guarantee long-term stability. Always request performance test videos and third-party inspection reports to verify that the actual output matches the technical datasheet.