The center is a part with a taper handle at the tail. When in use, it is mainly installed in the taper hole of the machine tool spindle. The head cone of the center can be used to support the workpiece, so as to support some complex parts. The rotary center is mainly composed of a thimble, a clamping device, a fixing pin and a bearing. One end of the thimble of the rotary center can be used to top the center hole, while the other end is a spherical part. In the use of the center, the thimble is fixed by the clamping device. If the hole cannot be punched in the use, the clamping device can be used to clamp the turning, and then the cutting of the fixed pin can be used to use the center. When using the top, you can select the type of top according to the machining accuracy, so that the machining will not be limited.

Some minor defects are common in the machining and production process of the machine tool. Although some minor defects will not have much impact on the whole production and processing, their work efficiency may be damaged if they occur in the whole production process. The rotary center plays a very important role in the machining of the workpiece by the machine tool, and the rotary center can rotate and then be inserted with the center, It can make the machine run more smoothly. At the same time, if the rotary center is used in the machine, some unnecessary problems can be solved or directly avoided.

The rotary center of the machine tool is composed of several parts to form a rotatable structure. The center is inserted into the center body, and the bearing needle, thrust bearing and bearing are installed at their joint parts to solve the problems of centripetal force and axial force generated by the rotary center of the machine tool in the work. As the machining surface of each part will have a certain degree of error (coaxiality error and roundness error) during manufacturing, the central axis of the shell taper handle and the central axis of the center are not coincident after assembly, that is, there is a combination error between the two, and the center will swing radially after the wear of the rolling bearing, thus reducing the machining accuracy. Therefore, the existence of these factors must be considered when grinding the center.