The causes of thread damage on CNC lathes may involve many aspects. Here are some of the main factors:

1. Improper material selection: When the hardness of the CNC lathe material is too high or the material quality is unstable, it may increase the difficulty of thread processing and lead to thread damage. In addition, if the material is not hard enough to meet the requirements, it may also cause the threads to deform and wear during use.

2. Unsuitable cutting parameters: The settings of CNC lathe cutting speed, feed amount, cutting depth and other parameters have an important impact on the quality of thread processing. Excessive feed, cutting depth or cutting speed may have adverse effects on thread processing, such as causing the thread pitch to be too large, the tooth height to be too low, the number of teeth to change, etc., thus damaging the thread.

3. Tool wear or improper selection: CNC lathe threading tools are the core tools for CNC lathe internal and external thread processing. The degree of wear or improper selection directly affects the quality of thread processing. Tool wear or insufficient smoothness of tiny cuts on the cutting edge may cause the bottom of the thread to be too flat or form a sharp angle, thereby affecting the accuracy of the thread. At the same time, if an improper tool is selected for thread processing, it may lead to uneven distribution of cutting force, which may lead to tooth decay.

4. Machine tool problems: The rigidity of CNC lathes directly affects the processing quality. If the machine tool is not rigid enough, it will easily produce vibration during the cutting process, which will cause thread rot. In addition, long-term use may cause machine tool bed wear, guide rail wear, thread pressure plate wear and other problems, thus affecting the thread processing accuracy and quality.

5. Improper use of cutting fluid: CNC lathe cutting fluid has lubrication and cooling effects during the turning process, which can reduce cutting temperature, reduce cutting force, and improve cutting quality. If the cutting fluid is used unreasonably, its effect may not be fully exerted, resulting in a decrease in thread processing quality.

In summary, in order to avoid thread damage on CNC lathes, it is necessary to comprehensively consider and optimize multiple aspects such as material selection, cutting parameter settings, tool status, machine tool status, and cutting fluid use. In actual operation, it is recommended to adjust relevant parameters and measures according to specific conditions to ensure the quality of thread processing.