Prior to the shipment of every CNC external cylindrical machine tool, Yelin’s engineers transform into meticulous detail inspectors, leaving no potential hazard unaddressed through a comprehensive, step-by-step verification process.

 
The inspection kicks off with the core performance check of the spindle operation—engineers monitor rotational stability, vibration amplitude and speed consistency under both idle and simulated load conditions, ensuring the spindle delivers the high-precision, low-noise operation required for heavy-duty machining tasks. Next comes the axial system accuracy verification: using advanced laser interferometers and precision dial indicators, they calibrate positional accuracy, repeatability and backlash of linear and rotary axes, strictly adhering to the tolerance standards that exceed industry benchmarks.
 
Beyond mechanical performance, the sealing integrity of electrical circuits and air paths is another critical checkpoint. Engineers conduct pressure retention tests on pneumatic components to eliminate leakage risks, and perform insulation resistance and continuity tests on electrical systems to guarantee safe and stable operation in harsh workshop environments. Every bolt torque, every wiring connection and every seal fitting is cross-checked and documented, forming a traceable quality record for each machine. By upholding these stringent inspection standards, Yelin Machine Tools builds an impregnable quality defense line. Each piece of equipment that rolls off the pre-shipment inspection line carries the brand’s craftsmanship and reliability, serving as a solid guarantee for customers’ production efficiency and operational stability.