Precise tool-setting device and method for numerically controlled lathe

The invention relates to a precise tool-setting device and method for a numerically controlled lathe. The precise tool-setting device comprises a chuck, a tool rest and a clamping claw arranged on thechuck and used for fixing a workpiece, wherein the chuck and the tool rest are arranged on the lathe; and standard cutting tools are correspondingly mounted on one sides of the four edges of the toolrest, and the four standard cutting tools are the 90-degree external circle roughing tool, the 90-degree external circle finishing tool, the cut-off tool and the 60-degree threading tool. According to the precise tool-setting method, an automatic trial cutting method controlled through a program is designed according to the thought of automatic tool-setting, measuring and error compensation. According to the precise tool-setting device and method, operation is simple and convenient, adjusting is easy, universality is high, the machining quality and precision requirements of the workpiece areensured, the working effici