The Longmen is driven by a servo motor and a precision ball screw. The linear guide rails have pre-tightening sliders. Normal acceleration and deceleration result in very little vibration. If there is a deviation in the hole position after long-term use， you can first check： ① whether the X/Y axis grating or encoder is contaminated； ② whether the bearing clearance at both ends of the screw has increased； ③ whether the lubrication of the guide rails is sufficient. It is recommended to recheck the positioning accuracy with a laser interferometer every three months and compensate for the reverse clearance.

The equipment has an inspection door and a transparent oil level observation window on the side of the bed. Daily checks do not require disassembling components. The oil filling port is usually led to an easily accessible position. When replacing the hydraulic oil, you can use a pump to insert an oil suction pipe from the oil filling port or open the bottom drain screw (requiring the removal of a small amount of iron shavings shield). It is recommended to replace the hydraulic oil every 1000 working hours or annually (46# anti-wear hydraulic oil), and replace the filter at the same time.

The clamps are usually divided into multiple groups (6 on each side). The foot pedal switch can control all the clamps to clamp or release simultaneously, making it convenient for loading and unloading. If you need to control a few clamps individually (for example, to avoid the processed holes), you can select the "group clamping" mode through the human-machine interface and manually check the clamps that need to be enabled. It is recommended to simulate the clamping before processing the special-shaped plates to avoid interference.

This equipment is mainly designed for large-diameter drilling of medium-thick plates (up to 100mm). The low speed and high torque are more conducive to heavy cutting with carbide or high-speed steel twist drills. If frequent drilling of small holes is required, it is recommended to select a high-speed spindle accessory or use a separate turret lathe. For occasional small holes, increasing the feed rate and using sharp drills can compensate for the insufficient speed.