Leader Chuck Systems now offers a range of 2-jaw, self-centring indexing chucks in diameters from 125 to 500 mm. Designed for holding valve bodies and similar fittings, the chucks feature interchangeable indexing plates. Usual divisions are four 90o movements, with indexing accuracy of ±2 seconds of arc held, but divisions of any incremental angle can be specified.
"Indexing chucks offer significant advantages for difficult-to-hold components that would typically require multiple or staged fixing – which can, of course, introduce errors," states managing director Mark Jones. "Component precision is derived from the indexing accuracy of the chuck as all the machining is effectively related to the first datum setting."
Manually indexed, the chucks can be manually or power clamped. Produced from high tensile forged steel, the units offer a simultaneous clamping drive that centres the workpiece as accurately as a standard power jaw chuck of the same size, says Leader.