The principle of tool length compensation for machine tool accessories The machining center needs to exchange tools frequently, and the difference in the length of each tool brings difficulties to the setting of the workpiece coordinate system. It can be imagined that the first tool cuts the workpiece normally, and after replacing a slightly longer tool, if the workpiece coordinate system remains unchanged, the part will be overcut, the principle of tool length compensation.
When setting the workpiece coordinate system, let the spindle taper hole datum coincide with the upper surface of the workpiece theoretically. When using each tool, the machine tool can be raised a certain distance according to the length of the tool, so that the tool tip is just on the upper surface of the workpiece. found out. The G codes to realize this function are G43, G44, G49. G43 is to compensate the tool upward, G44 is to compensate the tool downward, and G49 is to cancel the length compensation (G49 is safer to use after the z-axis returns to the origin). The drill bit compensates the value in the H1 memory upward and forward with the G43 command, and the machine tool accessories milling cutter compensates the value in the H2 memory upward and forward with the G43 command.
