fork-chuckn.Wood-turning a chuck with two or more teeth: see quot. 1874.
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1842 G. W. FrancisDict. ArtsFork Chuck.
1874 E. H. KnightPract. Dict. Mech.Fork-chuck (Turning), a piece of steel projecting from the live spindle and carrying the front center and a pair of joints which enter the wood and rotate it.