BIG BORE ® BB-EXL2G INCH SERRATION
Front-end pneumatic power chuck EXTRA large through-hole Ø 191 - 390 mm
■ Chuck size 510 - 900 ■ 3 jaws ■ Extended extra long jaw stroke
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 388-391 )
The principle invented by SMW: Air supply via distributor ring and SMW profile seal rings
Pressure control prox. sensor (M8 x 1)
Rapid and clamping stroke control prox. sensors (M8 x 1) 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.
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 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.
Rapid stroke / jaw
Clamping stroke / jaw
Fast movement
Slow movement
Technical data End machining of pipe with front and rear chucks
BB-EXL2G 510-191
BB-EXL2G 660-280
BB-EXL2G 900-390
SMW-AUTOBLOK Type Id. No. Through-hole Total stroke per jaw Rapid stroke per jaw* Clamping stroke per jaw Operating pressure min. / max.
77784553 191 (7.52“) 38.5 (1.52“) 30 (1.18“) 8.5 (0.33“)
77784566 280 (11.02“) 38.5 (1.52“) 30 (1.18“) 8.5 (0.33“)
77784588 390 (15.35“) 38.5 (1.52“) 30 (1.18“) 8.5 (0.33“)
mm (inch) mm (inch) mm (inch) mm (inch)
2 / 10 (29 / 145)
2 / 10 (29 / 145)
2 / 10 (29 / 145)
bar (psi)
760
1300
1800
Piston area
cm 2
115 (25853)
195 (43838)
270 (60698)
Gripping force at 6 bar (87 psi)
kN (lbf)
1300
1100
750
Max. speed
r.p.m.
37
58
78
liter
Air consumption / jaw stroke at 6 bar (87 psi)
260 (573)
470 (1036)
950 (2094)
Weight (without top jaws)
kg (lbs)
10
30.4
112
Moment of inertia
kg·m 2
* May not be used for clamping.
SMW-AUTOBLOK 378
376 SMW-AUTOBLOK
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