Large numerical control machining center in the actual use of the process will need to do more maintenance, after all, such a processing machinery and equipment if not well maintained, it will certainly have a series of effects on their use. 1, in the actual use of large numerical control machining center, must be used in a variety of different ways, and according to the smooth chart to end the smooth operation, in addition to the entire machining center will have different processing modes. In the actual processing, it is necessary to check whether the various parts can be fully equipped. To some extent, the cooling system should also check whether it is abnormal. Check whether their rocker arms are in the normal position. Also check whether the electric control switch of the handle is in the disconnected position and whether the drill bit can be clamped. Generally speaking, it is necessary to check whether some of their protective devices can be reliable. These are all very important. 2, in the process of processing a large numerical control machining center, but also to see if their scale is consistent, to see if their surface is clean, without any scratches, must be accurate in all places to install, and drilling process to ensure that in the bottom of the pad on a mat, do not adopt flexible supply, you must push the control nut inward, but also often do a good job of the relevant operation, if the operation is not smooth, it is necessary to end the use of equipment. 3, in the numerical control machining center for the actual use of the process, must be more than eight hours before opening the equipment, low-speed start, and then high-speed operation, to ensure that all parts can operate normally.