Spindle tapers and styles include: CAT or BT 40 and 50, HSK63, three-jaw chuck
with a through hole, and a 150mm diameter faceplate.
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.
The TM6 slant-bed turning center features a 6" three-jaw chuck
with a 15 hp, 6,000 rpm spindle and 12-station tool changer.
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
. Swarf conveyor, Kitagawa hydraulic three-jaw chucking system, parts catcher, and Renishaw probing system are optional.
The second is setup with a manual 12" diameter, three-jaw chuck
and a fixture.
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."