0 1000 2000 3000 4000 5000 6000 7000 8000 20 40 60 80 100 120 140 160 180 165-46 210-52 260-72 315-91 110-32 9000 FG F 260 220 180 140 100 60 20 0 1000 1500 2000 2500 3000 3500 500 400-128 500-155 240 200 160 120 80 40 FG F 115 Flat gripping force curve for high speeds Chuck body and internal parts are case hardened and polished for highest rigidity, durability and precision Clamping glossary FG Total gripping force at (3 jaws) (kN) FG Total gripping force at (3 jaws) (kN) wedge bar drive Speed (r.p.m.) Speed (r.p.m.) The data in the diagrams refer to 3 jaw chucks, newly maintained according to their service manuals using SMW-AUTOBLOK K05 grease. The static and dynamic gripping forces have been measured using standard soft top jaws, placed in a position not exceeding the outer diameter of the chuck. Safety advice / danger of damage: When using taller / heavier jaws and / or clamping on a bigger diameter reduce draw pull / rotating speed accordingly. 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. 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. SMW-AUTOBLOK chucks with wedge bar drive have a very low hysteresis. 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 counterbalance weights which allows highest speeds without vibration. INCH SERRATION: The connection between top jaws and master jaws is done through serration, T-nuts and bolts according to DIN 6353 (serration 90°, pitch in inches). This is standard on European chucks. HFKN chucks can be supplied either with inch serration or metric serration. METRIC SERRATION: The connection between top jaws and master jaws is done through serration, T-nuts and bolts according to ISO 9401 (serration 60°, pitch in mm). This is standard on Japanese chucks. Efficiency: Efficiency is the ratio between the calculated theoretical gripping force (disregarding friction) and the actual (measured) gripping force. 2 BIS Specials Website: www.bisspecials.com Email: info@bisspecials.com Tel: (0031) 0313 482566 Website: www.bisspecials.com Email: info@bisspecials.com Tel: (0031) 0313 482566
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