In the processing center, a variety of tools were installed in the magazine, according to the procedure laid down anytime tool selection and tool change actions. Therefore must use standard tool holders, so that the standard tool drilling, boring, expanding, milling and other processes used to quickly and accurately fitted to the machine spindle or magazine up. Programmers should be used to understand the structural dimension of the holder on the machine, as well as the adjustment range adjustment method to determine the radial and axial dimensions of the tool during programming. At present, China's processing center uses tsg tool system, which has two straight shank tool holders (three sizes) and taper shank (four sizes), including a total of 16 kinds of different uses of the shank.

    CNC machining in the economy, due to sharpening knives, measuring and replacement, mostly carried out manually, taking auxiliary longer, therefore, must arrange the order of the tool. General should follow the following principles: ① to minimize the number of tools; ② after clamping a tool, which can be carried out to complete all the processing site; ③ rough finishing tool should be used to separate, even for the same dimensions of the tool; ④ After the first milling and drilling; ⑤ for surface finishing first, after finishing the two-dimensional contour; ⑥ in where possible, should as far as possible the use of CNC machine tools automatic tool change features to improve production efficiency.