The nut fabrication machine of Heron (the first screw cutter in human history)

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The nut fabrication machine of Heron
(the first screw cutter in human history)


It was an instrument that allowed the opening up of spirals in holes. It consisted of a powerful base with a lengthwise hole which had pegs circumferentially (instead of a female screw) for the driving of an endless screw spiral. At the end of the endless screw there was crosswise a triangular cutting point (regulated with a wedge). The base was fitted onto the perforated processing object with the endless screw of the base aligned with the hole of the object. The endless screw, with the help of handles, was turned and driven inside the hole of the object opening up an internal spiral with its cutter.