When trial cutters are used for trial cuts or cuts, and the cutters are used to adjust the cutter position, the way to increase the symmetry is mainly to improve the measurement accuracy when the key side flipping method is used to check the symmetry. In addition to accurately rotating the workpiece angle and improving the measurement accuracy of the workpiece, when measuring the key side using the indicator, taking into account the influence of the roughness of the work table surface and the accuracy of the flatness and flatness on the side, an accuracy can be placed on the work surface. The higher parallel blocks will indicate the movement of the table seat in the plane of the block, thereby improving the measurement accuracy in the adjustment process. When the symmetry error trace horizontally adjusts the work table, in order to improve the micro-movement accuracy of the work table, it can be controlled by means of an indication table.

        When adjusting the milling position with the knife setting device, the milling machine tool is first aligned approximately with the side of the counter block. After trial cutting with the test piece, the width of the key side and the counter block is measured with the indicator meter, and the side indicates the value of both sides. The difference is the center deviation value; when the key width is slightly smaller than the width of the counter block, the size of the micro adjustment should also consider the effect of the key width. Compare the milled key side with the side of the counter block. If the measured values ??are the same, or if the two sides of the key are at the same size as the side of the block, the position of the milling cutter has been adjusted. In the case of minor adjustments, attention should be paid to the movement direction of the machine table.