If you are not familiar with the function of searching breakpoints, you will not be able to complete the entries on time during the operation of the competition, and you will lose the chance to win the championship. This paper introduces the breakpoint search function of Siemens 802S CNC car and the reasonable application of G54. Discuss with colleagues to improve the operational level of practical teaching. Key words: operation skills, finding breakpoints, starting to find G54, and rational use. About the author: Ge Wenjun, with a college degree, is now engaged in the teaching of CNC lathes, and has helped doctors and graduate students to engage in scientific research and invention for many years. He has been engaged in general turning process training and NC turning process training for many years, and has strong practical operation ability, rich internship training experience and strong professionalism. Since 2003, a number of college students have been trained continuously to obtain the vocational skill appraisal certificate of intermediate CNC lathe, and their work achievements are outstanding. The students they coached were evaluated as excellent, and they were hired as vocational schools to train more CNC talents. He has undertaken off-campus NC training for many times, participated in the NC Technology and Innovation Competition in Jiangsu Province and the NC Technology and Practice Teaching Seminar in six provinces and one city in East China. In August 2006, the 3rd Jiangsu Engineering Advanced Manufacturing Technology Practice Teaching and Innovative Production-CNC Teaching Competition was held in Jiangsu University, and the CNC Lathe Practice Teaching Competition was held in Fuzhou University in June. 1 1. Players from various universities showed their skills and showed one wonderful lecture classic after another. But in the operation of CNC lathe, there are many skills that are worth discussing and learning with colleagues. In our usual teaching and operation demonstration, we should use theory to guide practice and test the correctness of theory with practice. Before operating a CNC machine tool, we must first understand the instructions of the manufacturer of the CNC machine tool, so as to operate the machine tool well, give full play to its maximum benefit and efficiency, and guide teachers and students to be closer to production practice. In the numerical control lathe teaching competition, many contestants have to interrupt the automatic execution because of the difference of machine tool software, such as the program can't be * * *, or the input is wrong, or the program is wrong, or for other reasons. After modifying the program, they had to re-execute the program, wasting a lot of time, which led to the failure to complete the entries on time and lost the chance to win the championship. Players who are familiar with the "breakpoint search" function also gain time. What's more, it's a pity that mistakes occurred when using G54 function, which led to knife collision and buried hidden dangers. Therefore, these entries cannot be processed. 1. Application of breakpoint search after program reset Taking the CNC lathe of Siemens 802S system as an example, there is a function of "breakpoint search", which can continue to execute the reset execution program at the breakpoint without restarting the execution of the program, thus saving the execution of the already executed program segment and improving the efficiency. If the player is not clear about this function, once it is reset in the execution program, the entries will not be completed during the running of the game and the chance of winning the championship will be lost. The specific usage of this function is as follows: (1) In the automatic execution state, if the execution of the program needs to be interrupted for various reasons, we only need to press the reset button, and the menu will appear as shown in Figure-1, Figure-

(2) Enter the program window, modify the program to be changed, and close the program window. (3) Return to the automatic machining window, press the soft key under Search to open the search window, and the picture shown in Figure -2 will appear. (4) Press "breakpoint search", and a "load breakpoint" prompt will appear to reach the interrupted program segment. (5) After the above prompt appears, press "Start B Search" to start the breakpoint search and return the coordinates to the breakpoint. (6) When prompted, press the NC start key to continue automatic machining. After completing this series of operations, the CNC lathe will start executing the program from the interrupted program section. Instead of starting from the first step of the program. Thereby saving the time of the executed program. It improves our efficiency. Figure -22. Operation skills of establishing coordinate system: the establishment of programming coordinate system and the rational application of G54 should first establish programming coordinate system, that is, workpiece coordinate system, which is an X-Z rectangular coordinate system established with a point on the workpiece as the coordinate origin. Theoretically, the origin of the coordinate system on the workpiece can be at any point on the workpiece, but this may bring complicated calculation problems and increase the trouble of programming. In order to facilitate calculation and simplify programming, the origin of the workpiece coordinate system is usually set at the intersection of the rotation center and the right end face, so that the programming benchmark design and installation benchmark can overlap as much as possible. In this respect, contestants can generally follow. However, in the specific operation of machine tools, how to overlap the mechanical origin with the programming origin, the operation skills are different, and the effects are also different, some are more reasonable, some are more cumbersome and prone to errors. The tool compensation window suitable for the machine tool itself is built on the CNC car. G54 is not suitable to offset the cutter, so that the mechanical origin coincides with the programmed origin. Because: (1) The manufacturer of CNC lathe has considered this point, and adapted the tool compensation window according to the characteristics of CNC lathe to adapt it to the compensation characteristics of lathe. As long as the cutting method is tested, the compensation data of X-Z can be obtained and automatically "calculated" in the storage system. Try to cut the required tool in manual mode. After the trial cutting, as long as the diameter of the workpiece is input in the tool setting window, the system will automatically calculate the tool offset. No manual input is required after calculation. (2) Using G54 needs to calculate and input compensation data, which is troublesome to use. (3) The key to using G54 is to clear all the tool compensation data, otherwise it will hit the tool and even cause an accident. If all the tool compensation data are not cleared, the coordinate values needed by G54 are the calculated data of tool centering and tool compensation data vector, which can be used as the input value of G54. Many players just don't understand the precautions when using G54, which leads to the collision of the machine tool and the failure to complete the entry. (4)G54 should be suitable for: the same blank material can clamp and process multiple parts or a workpiece to realize multiple identical tool paths. Use G54 or G 158 to shift the zero point to page 2 of this article, which is currently on the next page of 1 [1] [2].

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