Tapping is to screw the tap into the bottom hole to be drilled with a certain torque to process internal threads.
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From the process of tapping, we can see that some of them are similar to screwing in when the thread is matched, that is, there is a process of rotating screwing in between the tap and the workpiece. In this process, there is a fixed relationship between mutual rotation and feed.
If the fixed relationship between mutual rotation and feed speed during tapping is determined by a machine (such as a lathe), it is a rigid tapping. There is a certain gap between the given reciprocal rotation and feed of machinery and tap thread during rigid tapping, so rigid tapping cannot be perfect;
If an elastic contraction link is added between mutual rotation and the feed given by machinery (such as lathe) during tapping, it is flexible tapping. In flexible tapping, the given mutual rotation of the machine and the gap between the feed and the thread of the tap can be eliminated by elastic contraction of the connecting rod. Thereby improving tapping quality.