wedge bar drive
Flat gripping force curve for high speeds
100 120 140 160 180
F G
2
F
315-91
260-72
40 60 80
210-52
165-46
20
110-32
0 1000 2000 3000 4000 5000 6000 7000 8000
9000
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.
Chuck body and internal parts are case hardened and polished for highest rigidity, durability and precision
260 240 220 200 180 160 140 120 100
400-128
500-155
60 80 20 40
F G
F
0
500
1000 1500 2000 2500 3000 3500
Speed (r.p.m.)
Safety advice / danger of damage: When using taller / heavier jaws and / or clamping on a bigger diameter reduce draw pull / rotating speed accordingly.
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. 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.
SMW-AUTOBLOK 115
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