BIG BORE ® BB-N
Front-end pneumatic power chuck EXTRA large through-hole Ø 140 - 410 mm
■ Chuck size 400 - 800 ■ Standard jaw stroke ■ 3 jaws
INCH SERRATION
Application/customer benefits • End machining of long pipes • Full spindle bore can be used Technical features
• Air chuck for external / internal 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 • Jaw stroke control for O.D. and I.D. gripping (not BB-N 400-140) Standard equipment Ordering example 3-jaw chuck BIG BORE BB-N 470-191 / Z310 2 elbow unions G 1/2“ 12 mounting bolts (9 for the BB-N 400) Accessories 1 lifting eye bolt Control unit AC-BB / AC-XN 1 set T-nuts with bolts (see general catalog pages 388-391 ) 1 set soft top jaws without distributor ring bracket
The principle invented by SMW: Air supply via distributor ring and SMW-profile seal rings
Pressure control prox. sensor (M8 x 1)
Stroke control prox. sensors (M8 x 1)
Picture 2 The SMW-profile seals lift to the expanded position, not touching the chuck body anymore. The clamping pressure is maintained
Picture 3 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 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 twin non- return valve.
by the twin non-return valve. The chuck can start to rotate.
* BB-N-400-140 has no stroke control.
Technical data
End machining of pipe with front and rear chucks
400-140 470-191 500-205 500-230 600-275 630-310 800-410 052300 053535 053830 053832 053834 053836 053838 140 (5.51“) 191 (7.52“) 205 (8.07“) 230 (9.06“) 275 (10.83“) 310 (12.20“) 410 (16.14“) 7 (0.28“) 7 (0.28“) 8.5 (0.33“) 8.5 (0.33“) 8.5 (0.33“) 10 (0.39“) 12 (0.47“) 2 / 10 (29 / 145) 710 565 1024 940 990 1270 2064 160 (35969) 115 (25853) 210 (47210) 190 (42714) 200 (44962) 220 (49458) 330 (74186) 1700 1700 1300 1300 1300 1000 750 21 16 36 32 34 52 108 150 (331) 150 (331) 230 (507) 200 (441) 270 (595) 420 (926) 650 (1433) 3.22 5.66 8.53 8 15 28 71.25
SMW-AUTOBLOK Type BB-N Id. No. Through-hole
mm (inch) mm (inch)
Stroke per jaw
Operating pressure min. / max.
bar (psi)
Piston area
cm 2
Gripping force at 6 bar
kN (lbf)
Max. speed
r.p.m.
Air consumption / jaw stroke at 6 bar
liter
Weight (without top jaws)
kg (lbs)
Moment of inertia
kg·m 2
SMW-AUTOBLOK 367
SMW-AUTOBLOK 366
364 SMW-AUTOBLOK
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