2. Technical presentation

2.1 Screw production

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2.1.1 Screw manufacture

Screws undergo several machining operations from the raw material bar. The first operation consists of turning the bar to obtain a bar slightly larger (1 mm) than the final diameter of the screw. In the second operation, this bar is then placed on a milling machine to machine the screw channels. This milling machine may be an end mill or a trimming machine. The third operation is to drill the screw, if this is necessary for thermal regulation. The fourth operation is to...