What is the abnormal sound of hob shaft of hobbing machine?

This situation is generally caused by overload, please pay attention to the following points:

1, the transmission shaft gearbox is low in lubricating oil and needs to be added. 2. The wear of hob is large or the hob is not grinded correctly, which leads to the increase of chip force and requires sharpening. 3. The cutter consumption is too large, which exceeds the load of hobbing machine. Adjust the tool consumption to an appropriate level. 4. Whether the hardness of the workpiece material is high.