366 SMW-AUTOBLOK 368 BB-EXL2G 510-191 BB-EXL2G 660-280 BB-EXL2G 900-390 77784553 77784566 77784588 191 (7.52“) 280 (11.02“) 390 (15.35“) 38.5 (1.52“) 38.5 (1.52“) 38.5 (1.52“) 30 (1.18“) 30 (1.18“) 30 (1.18“) 8.5 (0.33“) 8.5 (0.33“) 8.5 (0.33“) 2 / 10 (29 / 145) 2 / 10 (29 / 145) 2 / 10 (29 / 145) 760 1300 1800 115 (25853) 195 (43838) 270 (60698) 1300 1100 750 37 58 78 260 (573) 470 (1036) 950 (2094) 10 30.4 112 BIG BORE® BB-EXL2G INCH SERRATION Front-end pneumatic power chuck EXTRA large through-hole Ø 191 - 390 mm Application/customer benefits • End machining of long pipes with collars • Rapid and clamping stroke for short clamping cycles • Full spindle bore can be used Technical features • Suitable for jaw jog mode • Air chuck for external clamping with built-in pneumatic cylinder • Air feed via distributor ring and SMW-profile seals at stopped spindle • Built-in non-return valves maintain the air pressure during machining • Clamping pressure level constantly checked by a safety control system (only for external clamping) • Clamping stroke control (no clamping in rapid stroke) is monitored • Extra long jaw stroke (1 1/2“ total) Standard equipment Ordering example 3-jaw chuck Big Bore BB-EXL2G 660 / Z450 2 elbow unions G 1/2“ 12 mounting bolts 3 lifting eye bolt, 1 set T-nuts with bolts Accessories 1 set soft top jaws Control unit AC-BB / AC-XN Without distributor ring bracket (see general catalog pages 378-381) SMW-AUTOBLOK Type Id. No. Through-hole mm (inch) Total stroke per jaw mm (inch) Rapid stroke per jaw* mm (inch) Clamping stroke per jaw mm (inch) Operating pressure min. / max. bar (psi) Piston area cm2 Gripping force at 6 bar (87 psi) kN (lbf) Max. speed r.p.m. Air consumption / jaw stroke at 6 bar (87 psi) liter Weight (without top jaws) kg (lbs) Moment of inertia kg·m2 The principle invented by SMW: Air supply via distributor ring and SMW profile seal rings Rapid and clamping stroke control prox. sensors (M8 x 1) Pressure control prox. sensor (M8 x 1) Technical data End machining of pipe with front and rear chucks Rapid stroke / jaw Clamping stroke / jaw Slow movement Fast movement Picture 1 Open / close movement (only possible at stopped spindle). The profile seals deform radially under the pneumatic pressure, sealing on the chuck body and filling the cylinder chamber. When the clamping pressure is reached, the air feed is stopped, closing the non-return valve. Picture 2 The SMW profile seals lift to the expanded position, not touching the chuck body anymore. The clamping pressure is maintained by the twin non-return valve. The chuck can start to rotate. Picture 3 Safety pressure control: If the pressure is less than a pre-set safety level, the switch ring moves into the proximity switch field, sending an alarm signal. Jaw stroke control: If the part is clamped in a not correct jaw stroke position, the switch ring moves into the proximity switch field sending an alarm signal. * May not be used for clamping. ■ Chuck size 510 - 900 ■ 3 jaws ■ Extended extra long jaw stroke 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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