Clamping glossary
Case hardening: The surface of the components is hardened (60 HRC) to a depth of about 1 mm (0.04”). The core shows a high tensile strength and toughness. Compared to partial inductive hardened and nitrited parts the rigidity and the resistance against wear is greatly increased. Efficiency: The ratio between the calculated theoretical gripping force (disregarding friction) and the actual (measured) gripping force. High-low clamping: For easily deformable 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 wedge hook chucks the KNCS-N wedge bar drive is suitable for high-low clamping. Hysteresis: At high speeds the chuck body “grows” due to centrifugal force. The draw-pull of the clamping cylinder causes an increase in gripping force which cannot be decreased at a quick spindle stop (or change in speed). This can cause deformation at easily deformed parts. KNCS-N chucks with wedge bar drive have a very low hysteresis. Jaw change accuracy: The centering accuracy after a jaw change with once already bored / ground jaws on the chuck. The clamping force on the KNCS-N is transmitted via the wedge bar drive.
The engaging / disengaging of the jaws is done by an additional tangen- tial movement of the wedge bars. This proven and patented design with self-acting cleaning of the serration offers a constant high jaw change accuracy after jaw changing. Jaw safety interlock: At quick jaw change chucks the transmission of the gripping force to the interchangeable clamping jaws is done via a serration. With existing chuck designs misoperation by the operator can cause danger to man and machine if the jaw is not inserted correctly i.e. the serration is not fully engaged.
The KNCS-N is equipped with a unique safety interlock: The built-in safety interlock eliminates misoperation.
Repeatability: The centering accuracy of the chuck equipped with one set of jaws starting from the first up to the last component of a batch. Due to the wedge bar drive KNCS-N chucks offer a much higher repeatability compared to wedge hook chucks. Wedge bar drive: The chuck is driven by tangentially mounted wedge bars. This design allows highest repeatability and rigidity. These chucks have very low loss in gripping force due to centrifugal force. The design does not require counter balance weights which allows highest speeds without vibration.
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Chuck body and internal parts are case hardened and polished for highest rigidity, durability and precision
Large through-hole for full use of spindle bore
SMW-AUTOBLOK 141
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