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5. As the strength of shafts is determined by their size, and their size fixed by the strains to which they are subjected, [45] strains are first to be considered.

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"Well? Go on, nothing could be worse than what has happened."Screw-cutting machines may be divided into modifications as follows:(1) Machines with running dies mounted in what is called the head; (2) Machines with fixed dies, in which motion is given to the rod or blank to be threaded; (3) Machines with expanding dies which open and release the screws when finished without running back; (4) Machines with solid dies, in which the screws have to be withdrawn by changing the motion of the driving gearing; making in all four different types.
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