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

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 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

If in this case a universal chuck be used, and the work does not run quite true, it may be corrected by slacking the necessary dog or jaw on one side, and tightening up again from the screw of the necessary jaw on the other.

From Project Gutenberg

In turning up the eccentric, the plain face should be faced first, setting it true, or nearly so, with the circumference of the eccentric, as will be the case if the circumference is held in a universal chuck, but if the hub is so long that this cannot be done because the chuck jaws cannot reach the circumference, the hub itself may be held in an independent 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