This International Standard describes, with reference to ISO 230-1, the geometrical tests and the corresponding permissible deviations of two classes of accuracy for self-centring, manually-operated chucks for machine tools with more than two jaws.
This type of chuck has jaws known as "one-piece h?rd jaws", the relatively large stroke of which allows quick adaptation to the most varied sizes of workpieces without dismounting.
This International Standard deals only with the inspection of rotational accuracy of the chuck, the straightening and the centring of workpieces. It does not apply to other dynamic qualities, such as measurement of counterbalancing, balancing or measurement of gripping powers.