Aircraft Aluminum Profile Cnc Machining Milling Turning Parts

The application of the thread principle can be traced back to the helical water lifting tool created by The Greek scholar Archimedes in 220 BC. In the 4th century, the Mediterranean countries began to apply the bolt and nut principle to wine-making presses. At that time, the external thread is a string wound to a cylindrical rod, and then according to this mark carved. The inner thread is often wrapped with soft material on the outer thread by hammering shape. Around 1500, The Italian Leonardo Da Vinci In leonardo Da Vinci's sketch of thread machining device, the idea of using master screw and exchange gear to process threads of different pitch has been proposed.

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