In modern machining centers, a rotary table is commonly used (as shown in Fig. 1d), enabling the machining of multiple surfaces without repositioning the workpiece. Accurately determining the center of rotation of this rotary table is crucial for ensuring high-quality part production. This article focuses on the measurement method of the rotation center using a horizontal machining center as an example. The center of rotation of the worktable lies at the center point of its upper surface, as illustrated in Figure 1. Several methods exist to measure this center, but one widely used technique involves a standard mandrel, a dial indicator, and gauge blocks. For measuring the X-direction center of rotation: The principle is based on aligning the spindle’s centerline with the table’s rotation center. The X-coordinate displayed on the machine corresponds to the distance from the table’s rotation center to the machine’s X-axis origin. The process involves mounting a standard mandrel on the spindle and fixing a dial indicator on the worktable. After adjusting the dial to zero at the highest point of the mandrel, the mandrel is moved along the +Z axis. Then, the table is rotated 180 degrees, and the mandrel is returned to the original position along the -Z axis. The dial indicator’s readings should be equal at both positions, confirming the X-direction alignment. For measuring the Y-direction center of rotation: This involves determining the distance from the worktable’s upper surface to the machine’s Y-axis origin. A gauge block is inserted between the spindle and the worktable, and the Y-axis position is adjusted until the block just fits. The Y-coordinate value on the CRT, minus the gauge height and the mandrel radius, gives the Y-direction center position. For measuring the Z-direction center of rotation: The goal is to find the vertical distance between the worktable’s rotation center and the machine’s Z-axis origin. This is done by positioning the table at 0° and 180°, then adjusting the Z-axis so that the dial indicator shows the same reading at both positions. The accuracy of this measurement directly affects the dimensional precision of machined parts. Once determined, the rotation center serves as a reliable reference. However, due to mechanical wear or failures, such as a loose spindle nut or a collision during machining, the center may shift over time. Therefore, it is essential to recalibrate the rotation center regularly, especially before working on high-precision components, to ensure consistent and accurate machining results.

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