Centerless lathes (or peeling machines) are high-precision machining equipment, and their horizontal alignment directly affects machining accuracy, tool life, and equipment stability. After installation, scientific calibration is required to ensure the bed is in a horizontal position. The specific steps are as follows: 1.Prepare calibration tools High-precision spirit levels (accuracy of at least 0.02 mm/m is recommended), shims (adjustable mechanical shims or rubber damping pads), wrenches, and adjusting screws are required. The spirit level must be calibrated to ensure reliable measurement data. 2.Determine the calibration reference plane Using the guide surface of the centerless lathe bed as the reference, prioritize calibrating the horizontal alignment in both the longitudinal (along the machining direction) and transverse (perpendicular to the machining direction) directions. If the bed is a segmented structure, calibrate each segment separately and ensure overall consistency. 3.Longitudinal horizontal calibration Place the spirit level on the longitudinal guide rail of the bed and move it along the machining direction, recording the readings at various positions. Adjust the height of the centerless lathe’s leveling bolts or shims to ensure that the longitudinal horizontal deviation does not exceed 0.05 mm/m (refer to the equipment manual for specific standards). When adjusting, tighten the bolts symmetrically to avoid bed distortion caused by uneven force on one side. 4.Transverse horizontal calibration Rotate the spirit level 90° and place it on the transverse guide rail of the bed, repeating the measurement and adjustment steps. Transverse horizontal alignment usually requires stricter tolerances (e.g., ≤0.03 mm/m), as tool vibration and workpiece feeding are more sensitive to transverse stability. 5.Re-inspection and securing After the initial adjustment, multiple re-inspections and fine-tuning are required until the spirit level readings are stable at any position. Tighten all leveling bolts and verify the horizontal alignment again to prevent deviations caused by loose bolts. If the ambient temperature changes significantly, wait until the centerless lathe’s temperature stabilizes (usually 2-4 hours) before confirming the alignment. 6.Handling special circumstances If the ground is uneven, adjustable shims or damping devices should be installed between the foundation and the centerless lathe, and secured with secondary grouting to ensure long-term stability.

In 2024, the Northern Heavy Industries (NHI) Endeavour TBM (Tunnel Bone Mine) set a world record for single-machine tunneling of 26.521 kilometers. This achievement was driven by breakthroughs in multiple core technologies. Previously, TBM main bearings had long relied on imports. NHI, in collaboration with research institutions, conducted hundreds of tests and developed high-strength, wear-resistant main bearings. These bearings offer a 20% longer service life and a 35% lower cost than imported products, effectively breaking the monopoly of foreign technology. The Endeavour TBM’s intelligent geological detection system plays a crucial role in complex geological construction. It analyzes rock hardness, water content, and other data in real time, automatically adjusting the cutterhead speed and thrust. For example, in a mountain tunnel project, when encountering crushed rock, the system quickly switched to “staged cutting” mode, achieving a stable daily tunneling efficiency of over 12 meters, a 40% increase over traditional equipment. Furthermore, the equipment’s modular design reduces cutterhead replacement time from three days to eight hours, significantly reducing project downtime. This provides an efficient solution for long-distance tunnel construction in China and further consolidates my country’s technological leadership in the global shield machine industry.