universal chuck

American  

noun

1. a chuck, as on a lathe headstock, having three stepped jaws moving simultaneously for precise centering of a workpiece of any of a wide range of sizes.

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Etymology

Origin of universal chuck

First recorded in 1815–25

Example Sentences

The strap should first be held in a universal chuck bolted to the face plate, or held in dogs such as shown in Fig.

From Project Gutenberg

Here it may be added that it will not materially aid the holding of the work true at the live centre end, by placing it on the live centre and then tightening the universal chuck jaws on it, because the pressure of those jaws will spring it away to some extent from the live centres.

From Project Gutenberg

The jaws may be reversed in their slots and operated simultaneously as a universal chuck, or independently as a simple jaw chuck.

From Project Gutenberg

Now the boxes c afford journal bearing to, and carry the worm or screws b as well as the chuck jaws a, hence revolving d operates the jaws simultaneously and concentrically as in a scroll or universal chuck.

From Project Gutenberg

The work is held in a universal chuck, and if long is supported by a stay as shown in the figure.

From Project Gutenberg