three-jaw chuck


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three-jaw chuck

[′thrē ¦jȯ ′chək]
(design engineering)
A drill chuck having three serrated-face movable jaws that can grip and hold fast an inserted drill rod.
References in periodicals archive ?
A three-jaw chuck is permissible as long as it centers accurately but a four-jaw is recommended.
While Wilson and his company appreciate three-jaw chucks for some applications, "when we're turning a rough forging, a three-jaw chuck won't work, because there are small flats and peaks on the part that won't let the chuck properly grip the bar," he said.
GHA6-8-66 in a big bore, 8", three-jaw chuck with a 66mm through hole, compared to a standard 52mm through hole for this size chuck, allowing the user to chuck larger parts or bar feed a larger diameter bar.
The blank round stock to be transformed into your mandrel can be held in a three-jaw chuck, but a four-jaw self-centering one is much preferred.
Most of us are familiar with the standard three-jaw chuck used for either first or second turning operations.
Standard equipment includes Siemens 840 control; digital axis, spindle drives, and motors; 12-station Sauter auto-indexing turret; and 250-mm diameter three-jaw chuck.
A six-jaw chuck, instead of a standard three-jaw chuck is used to ensure true roundness of the parts.
A three-jaw chuck is used for gripping cylindrical workpieces when the operations to be performed are such that the machined surface is concentric with the work surfaces.
They would add a machine mainly dedicated to running bar stock using a collet chuck, then run to a two-jaw or three-jaw chuck running shapes, or castings, with a two-jaw or three-jaw chuck - that requires a long changeover.
Working on the principle of a three-jaw chuck, it centers the part accurately, regardless of workpiece size.