In the field of modern machining, the accuracy of CNC rotary tables plays a crucial role in product quality and production efficiency. However, various factors can affect the accuracy of CNC rotary tables. Understanding these factors and implementing effective accuracy compensation measures is key to ensuring machining accuracy.

　　First, manufacturing and assembly errors are one of the important factors affecting the accuracy of CNC rotary tables. During the production of the rotary table, deviations in the machining accuracy of components and the accuracy of assembly will directly lead to a decrease in the motion accuracy of the rotary table. For example, low manufacturing accuracy of the worm gear and improper bearing installation will cause rotary errors of the rotary table.

　　Secondly, temperature changes will also have a significant impact on accuracy. Because heat is generated during processing, the temperature of the rotary table and its surrounding environment increases. Different materials have different coefficients of thermal expansion, which will cause dimensional changes in the components of the rotary table, thus affecting the positioning and repeatability accuracy of the rotary table.

　　In addition, wear and tear is also a factor that cannot be ignored. Long-term use will cause wear and tear on the moving parts of the rotary table, such as guides and lead screws, which will affect the accuracy of the rotary table.

　　Various accuracy compensation methods can be adopted to address these influencing factors.

　　First, software compensation. Using the compensation function in the CNC system, an error model is established based on the actual measured error data, and the corresponding compensation parameters are input into the control system to achieve automatic compensation of the error. For example, pitch error and backlash can be compensated.

　　Second, mechanical adjustment methods. For errors caused by improper assembly or component deformation, the accuracy can be improved by adjusting the position and tightness of the components. For example, adjusting the meshing clearance of the worm gear and the pre-tightening force of the lead screw.

　　Third, using real-time monitoring technology for compensation. By installing sensors, the motion state and position error of the rotary table are monitored in real time, and the data is fed back to the control system for timely adjustment and compensation.

　　When performing accuracy compensation, a comprehensive accuracy test of the CNC rotary table is required first. Use high-precision measuring instruments, such as laser interferometers and ball bars, to measure various accuracy indicators of the rotary table and analyze the type and magnitude of errors.

　　Then, according to the test results and error laws, select the appropriate compensation method and parameters. At the same time, it should be noted that the effect of compensation needs to be verified and adjusted multiple times to ensure that the ideal accuracy requirements are met.

　　In addition, in order to maintain the accuracy of the CNC rotary table in the long term, daily maintenance and maintenance work must also be done. Regularly clean, lubricate, and check the wear and tear of components, and replace severely worn components in time.

　　In summary, there are many factors that affect the accuracy of CNC rotary tables. By adopting effective accuracy compensation measures and combining good maintenance, the accuracy of CNC rotary tables can be significantly improved to meet the needs of high-precision processing and provide strong support for the development of manufacturing.