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Scroll-chuck.

Lathe.) A device for holding and centering work in the lathe. The body of the chuck is formed of three pieces a b c; between these is inclosed a ring d, which may be revolved independently. In the face of the chuck are three radial grooves, each of which has two feathers projecting from its sides into the body of the groove; the three jaws slide freely along these grooves and feathers. A spiral on the face of the ring d enters a counterpart spiral on the inner ends of the jaws, so that by revolving the ring these are caused to approach or recede from the center.

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