When we perform thread processing on a CNC lathe, we usually use a tool for cutting. When processing large-pitch threads, due to excessive tool wear, it will cause large changes in thread size and low thread accuracy after cutting. After years of exploration, we have figured out a kind of rough and fine turning tool for cutting and processing threads on CNC lathes.

 

 

During the machining process, when the rough turning blade is worn to the limit, the fine turning blade is replaced with the rough turning tool, and the fine turning tool is replaced with a new blade. This can reduce the tool cost while ensuring the accuracy of thread cutting. The key of this method depends on the precision of coarse and fine thread cutters.　

 

 

1. Operation method 　　

 

Cut the end face and the outer circle of the workpiece by one knife (the end face is flat, the outer circle is turned), and then measure the diameter D of the outer circle; change the rough turning thread cutter to cut the thread. The specific method is as follows: 　　

 

Put the roughing tool (T0X00) with the manual pulse generator on the outer circle D after cutting. Use the manual pulse generator to shake out the workpiece in the positive direction of the Z axis, and enter the D value (the tool is finished with the X axis). The specific data displayed on the lower X axis. Manually feed the pulse generator in the negative direction on the data displayed on the X axis for 1 to 2 mm. Similarly, the pulse generator is fed in the negative direction of the Z axis, and the tool can be cut to the workpiece.

 

Enter Z0 (after Z axis tool setting). At this time, the rough turning thread tool setting is completed.　　

 

According to this method, the thread is finished, and the operation steps are exactly the same as the rough turning tool setting method. In this way, there will be no buckling during the cutting process. Even if there are more tools to cut, it will not produce buckles.

 

2. Precautions　　

 

(1) When each tool is aligned with the X axis, the machine tool displays different numbers. Be sure to record the actual data of each tool. After exiting the X axis, the data of multiple thread cutting tools in the X axis must be the same, and there must be no difference.

 

(2) In the process of tool setting, when approaching the X and Z axes of the workpiece, it is recommended that the manual pulse generator preferably selects the feed rate of 0.001mm