SP ® + SP-ES + SP-L
Front-end pneumatic power chuck Ø 26 - 115 mm
■ EXTRA large through-hole ■ 3 jaws, chuck size 125 - 350 ■ SP-ES: Chuck with rapid and clamping stroke ■ SP-L: Chuck with long jaw stroke
INCH SERRATION
Application/customer benefits • Universally used in turning machines, rotary tables, handling equipment, welding etc. • For machines without hydraulic cylinder • Easy exchange for manual chucks Technical features • Power chuck with built-in pneumatic cylinder. Force transmission via wedge hook • Mounting of the distributor ring on the headstock or with the centering ring on the chuck with anti-rotation bracket • Open and close only at stopped spindle. Air transmission via distributor ring and SMW-profile seals (monitoring by SMW control cabinet) • Easy installation with no additional adapters required Standard equipment Ordering example 3-jaw chuck 3-jaw chuck SP 160 / Z155 1 set T-nuts with bolts 1 set soft top jaws 2 elbow unions G1/4” Accessories (G1/8” on SP 125) Control units Spacer ring and centering ring, without (see general catalog pages 388-391) distributor ring bracket / anti-rotation bracket
Two ways of mounting the distributor ring: ■ Spacer ring and distributor ring bracket ■ Centering ring and anti rotation bracket
The principle invented by SMW: Air supply via distributor ring and SMW-profile seal rings
Distributor ring
Anti-rotation bracket
Spacer ring
Centering ring
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.
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 Distributor ring bracket fixed (stationary) on the headstock to support the distributor ring mounted with the spacer ring. No contact between the static distribution ring and the rotating chuck.
Picture 4 Distributor ring mounted on the outer diameter of the chuck with the centering ring (teflon part subject to wear). Need of an anti-rotation bracket fixed to the machine headstock.
Technical data
SP 125-26 SP 160-38 SP 240-78 SP 280-92 SP 350-115 SP 350-115ES SP-L 350-90 012044 012045 053170 052778 012588 052850 053193 3 (0.12“) 4.2 (0.17“) 4.2 (0.17“) 5 (0.20“) 5 (0.20“) 10+5* (0.39“+0.20“) 24 (0.94“) 2 / 10 (29 / 145) 129 206 290 535 486 486 486 20 (4496) 35 (7868) 60 (13489) 95 (21357) 88 (19783) 88 (19783) 31 (6969) 4000 3500 2800 2200 2200 2200 1000 4200 4200 3500 3200 3000 3000 1000 1.4 3.4 5.2 10.0 9.4 13.5 13.5 11 (24) 23 (51) 40 (88) 62 () 78 (137) 91 (201) 97 (214) 0.028 0.125 0.412 0.823 1.125 1.62 1.62
SMW-AUTOBLOK Type Id. No. Stroke per jaw Operating pressure min. / max.
mm (inch) bar (psi)
Piston area
cm²
Gripping force at 6 bar (87 psi)
kN (lbf)
Max. speed (distribution ring with centering ring) Max. speed (distribution ring fixed stationary) Air consumption/jaw stroke at 6 bar
r.p.m. r.p.m.
liter
Weight (without jaws) Moment of inertia
kg (lbs)
kg·m² * 10 mm (0.39“) extended stroke (must not be used for clamping) + 5 mm (0.20“) clamping stroke.
SMW-AUTOBLOK 363
SMW-AUTOBLOK 362
360 SMW-AUTOBLOK
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