Description & Features:The Our 2/4/5/6-Jaw Self-Centring Chucks have features similar to that of 3-Jaw Self-Centring Chucks. The chuck body is made either of cast iron hardened between 180 and 220 BHN, or of forged steel. The scroll plates are made of high quality heat-treated carbon steel. The jaws and pinions are made of alloy case hardened steel.
Selection of 2/4/5/6-Jaw Chucksa)The diameter of the Chucks must be chosen so that the jaws do not protrude outside the chuck body or within the chuck bore, when holding a job. This is particularly important in 6-Jaw Chucks, as the Chucks have six slots the stresses on the chuck body will be very high if the jaws were to extend outside.
b) The diameter of the Chuck should be slightly less than twice the centre height of the machine.
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Care in Use
The 2/4/6-Jaw self Cent ring Chucks need to be mounted such as to ensure they hold true to the centre of the machine . For this, ensure that the face and outer diameter of the backplate run true. A Chuck so mounted will run true to the machine spindle.