Clamping glossary
2+2+2 Equalisation: A system which allows 2 jaws in a pair to do a different radial jaw stroke. On raw material clamping the system ensures that all 6 jaws are in contact with the workpiece. The gripping force is distributed onto all 6 jaws and reduces the deformation of the workpiece. Locking system for 6 jaw self centering: SJL chucks have a locking system that allows to lock the 2+2+2 equalisation. In this setting the SJL chuck can be used like a standard 6 jaw chuck with 6 concentric jaws. This setting can be used to clamp thin walled workpieces that need an equal wall thickness. Air sensing: Air is fed through the contact face of the work stop. When the workpiece is in contact with the work stop, the airflow is stopped and converts into a signal. If the component is not correctly positioned or is lifted, the machine can not start or the spindle is stopped. The preparation of this important feature is standard on all SJL type chucks.
Centrifugal force compensation: When jaw chucks are rotating, the mass of the master jaws / top jaws is subject to centrifugal force. This centrifugal force reduces the dynamic grip force, and thus limits the feeds and speeds for machining. All SJL chucks (excluded SJLS) have a centrifugal force compensation system built in by default which reduces this effect and allows machining at higher speed with more aggressive feed rates. Chuck body reinforcement: When the chucks are rotating, the chuck body has to prop up against the static gripping force and against the centrifugal force caused by the rotation speed. On 6 jaw chucks, the centrifugal force caused by the jaws is the double compared to 3 jaw chucks. In order to increase the stiffness of the chuck body, SJL chucks have a reinforcement on the chuck body. High-low clamping: For easily deformed components. High gripping forces for the rough cut are reduced to low gripping forces for the finish cut without unchucking. This means less deformation on the finished components. Contrarily to conventional chucks, the SJL lever drive is suitable for high-low clamping.
4
Centrifugal force compensation
Reinforcement of the chuck body
Stop ring
Pivot bracket
Medium feed for air sensing (3 x 120°)
Piston
Medium feed for air sensing or coolant flush (in center)
Locking of the equalising via central screw (from 2+2+2 to 6 jaw self centering)
Back flange
Master jaws
Chuck front cover
SMW-AUTOBLOK 225
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