Chucks are widely used in lathe holding devices self centering scroll chucks with two, three, four and six jaws and independent four jaw chuck is used for odd shaped workpieces.
There are several variations such as combination chucks with self centering and independent jaw actions and jaws powered by air or hydraulic cylinders on the rear of the spindle.
Special top jaws may be designed for better fit to the gripping diameter of the workpiece. Standard jaws usual will not be in full contact with workpiece. The jaws height should be kept short in order to grip parts as close to the chuck face as possible.
Soft jaws or hard jaws are commonly used on previously finished or smooth diameters.
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