When the lathe spindle is running, it suddenly slows down and then accelerates back to its original speed.

Does the subject want to ask, "What is the reason why the lathe spindle suddenly slows down during operation and then accelerates back to its original speed?" Tool wear leads to the increase of turning load. The spindle of CNC lathe refers to the spindle that drives the workpiece or tool to rotate on the machine tool. When the lathe spindle is running, it suddenly slows down and then accelerates back to its original speed. The reason is that tool wear leads to the increase of turning load, which leads to the increase of spindle load and the deceleration of spindle. When the spindle decelerates, the electric control system will issue an instruction to accelerate the spindle motor again and restore the original spindle speed.