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What's the difference between a tapping machine and a rubbing machine?
Tapping refers to tapping the inner wall of the hole; His function is to make wires. So that corresponding bolts or screws can be connected with it.
The working principle of thread rolling is that two pieces are the same, and the tooth profile of thread rolling surface is the same as the thread shape of bolt. When the wire rolling plates move each other, the bolt blank between the two wire rolling plates is tightened. The washboard can process the thread of the bolt in one round trip, which is quite fast. Wire rolling is mostly used to process small bolts.
Personal summary: tapping is the processing of hollow inner wall, and rubbing is the processing of the outer surface of cylindrical workpiece.
Yaoyao ~
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