SMW front operatedpneumatic power chuckfor chuck- and bar work

SPANNSYSTEME

L

SP 125/3Z-SP315/3Z

Advantages and ApplicationsWhy have SMW Front Operated Power Chucks steadily in-creased in popularity?1. Air is introduced into the pneumatic clamping cylinder,which is an integral part of the chuck, by means of specialCircular Sealing Rings which are patented throughout theworld. This construction means that all chucks have a com-pletely unobstructed through bore.

2. The double-acting piston enables external and internalchucking to take place thus achieving versatile applicationfor all chucking and bar work.3. Simple quick mounting and removal of the chuck permitsmachining operations on both one-off and batch work. Thisversatility facilitates flexible production planning.4. A great deal of time is saved when loading and unload-ing components. This saving in time per component morethan compensates for the initial cost of the chuck.5. Operational safety is guaranteed by certificates issuedby supervising authorities. Maximum safety is also main-tained, when the spindle is running, by the clamping pres-sure retained in the enclosed cylinder, the self-lockingdouble wedged piston, and the electromagnetic locking ofthe push buttons actuating the control unit.All further requirements of the supervising authorities re-garding operational safety are met by an electro-pneumaticsafety control unit type PSS 10 and corresponding electro-pneumatic safety control unit type SP-EPK-10-24.6. At high speeds the reduction in clamping pressure,brought about by centrifugal force, is limited to a minimumby a self locking double wedge action.7. The high clamping forces which are attained from aline pressure of 85 p.s.i., together with the self-sustainedpressure in the chuck aimed at repeated clamping con-

centricity, are further recommendations for the applicationof our chucks to a wide range of machines such as centrelathes, copy lathes, N.C. lathes, turret lathes, semi-automa-tics, indexing machines, special purpose machines andgrinding machines.What design characteristics make the SMW type SPChuck outstanding?1. The location and centering of the Distributor Ring bymeans of a resin based Centering Ring presents a troubleand maintenance-free solution to the centering of theDistributor Ring.2. The patented Circular Sealing Rings are hard wearingand deform in a radial direction at an operating pressureon only 14 p.s.i. which facilitates the machining of thin wallcomponents at low clamping forces. The clamping force isproportional to the line pressure.3. The twin non-return valve, the "vital part" of the chuck,is a fully enclosed unit but very accessable and inter-changeable within seconds.4. All chucks are dynamically balanced after assembly, andpermit high speeds. Specials are available for extremelyhigh speeds.5. The chuck is easily dismantled for cleaning and main-tenance, this applies particularly to the Distributor Ringsystem. The back location plate which incorporates thestandard H6 location register can be exchanged for a shorttaper direct mounting plate.6. Special care was taken during design to preventingress of swarf, dirt an coolant.More than 16000 SMW Power Chucks are used on lathesof all types in many countries and prove the reliability ofthe design and quality of the product.

SP250/2Z SP250/3C6

Data and Chuck Dimensions

SMW Profile seals_Distributor ring ,Centering ring

Piston cover

Chuck body

— Sealing disc

Grease nipple

/

в

Guide bush

Piston

— Plug

Twin non-return valve

- Circlip

Pneumatic-^ ч

x -Back location plateconnection -Spacer

Chuck sizes, two- and three-jaw 125-26 160-38 200-52 250-68 315-90 315-105

Chuck diameterCylinder diameterDistributor ring diameterChuck heightChuck boreMounting recess diameter H 6Depth of recessPitch circle diameterStud with nutShort taper sizes (on request)Pitch circle for distributor ring 6 x M 6DistanceDistributor ring widthPneumatic connectionOuter distance T-nut

Mid distance T-nut

Lenght serrationDistance master jaws

mm.min.max.

Clamping range

max.External clampingInternal clamping

Max. Speed*for distributor ring with centering ringfor distributor ring fixed stationaryMoment of inertia GD2 (without top jaws)Max. operating pressureClamping stroke/jawAir consumption/jaw stroke at 6 bar (85 p.s.i.)Clamping force of jaws at 6 bar (85 p.s.i.)Weight without top jaw

AВСDEFGHJ

КLMNО

SТ

rpmrpmkgm2

bar

Itr.daN"kg

130160204

9526

1206,5

137M 8 X 3 03 ; 4 ; 5

1901035

R VB"6

17254028

12-14066-200

400045000,028

1031

200011

165205255123

381556,5

180M 1 2 X 4 0

4; 5;624214,5

46R '/»"

821315037

16-18070-240

35004200

0,12510

4,22,4

350023

205248300

127,552

1956,5

223,8M 12X40

5 ; 6 ; 8285

1548

R W8

24405948

20-22080-280

28003800

0,26210

4,23,9

600034

255315372

139,568

2356,5

290,5M12X40

6; 8; 11358

1552

R W10295175

57,525-280

106-350

2200j 3500

0,67510

56,6

950054

320350413150

902706,5

318M 12x40

6;8;1139722,5

52

R 1/4"1029719570

15-340130-410

180025001,35

105

8,212000

82

335315372

149,51052356,5

290,5M12X40

8;11358

2053

R 'A"1029719578

30-340140-410

220030001,125

105

5,48000

78

Specials for higher speeds on request.We reserve the right to change the above datain the interests of progress.

* Only admissible at a minimum operating pressure of 6 bar(85 p.s.i.) and standard jaw weight.

" 1 daN (Deka-Newton) = 1,02 kp

Standard Accessories: 2 elbow unions R 'A" on Distributor ring (R Va" with size 125)1 dowel for Distributor Ring to locate fork-type element6 studs M12, 40 mm long DIN 938 with nuts2 unions R 'A" to connect to control unit (R Ve" with size 125)Spacer for stationary mounting of distributor ring

k 1 set of mounting instructions manuals.

Order examples: Type SP 1 60-38 3 Z 3 jaw execution of size 160, including base jaws, T-nuts and bolts, through hole 38 mm,with centering rim mounting.

Type SP 200-52 3 В 5 3 jaw execution of size 200, including base jaws, T-nuts and bolts, through hole 52 mm,short taper direct mounting to DIN 55022, taper size 5.

Type SP 250-68 2 D 6 2 jaw execution of size 250, including base jaws, T-nuts and bolts, through hole 68 mm,with short taper direct mounting to ASA В 5.9 D1 "Camlock", taper size 6.

Top Jaws

TypeSP-GUB Type SP-NST Type SP-GSB

Hardened, reversible top jaws type SP-GUB are manu-factured in complete sets and are provided with groundserrations permitting fast and accurate adjustment to suitcomponent diameters. The concentricity of hardened andreversible jaws, without being ground in position, is inaccordance with DIN 6350 standards for manual chucks.

6 T-nuts and bolts type SP-NST are included in deliveryof each set.Hardened roughing jaws type SP-GSB are provided withmilled serrations. The serrations are particularly sharp forroughing black bar and forged or cast iron blanks, or pre-machined components, too.

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Hardened reversible jaws type SP-GUB

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125

582440

911

4,544

!/i6"x90c

9,518

8,413,513,2

1,5

160

7830461114

4,544

i/i б" х 90°1622

11,517,5

132 0

200

8836501217

4,544

i/i e" x 90°2024142013

2,5

250

10844581421

4 ,555

'/I6"X90°26301524

14,54,5

315

13444581421

4,518

5i/i e" x 90°

38361524

14,55,8

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Hardened roughing jaws type SP-GSB

AВСDEFGHJКLMNОkg

125

5824401311

4,544

/ 6 " X 9 0 °9,518

8,413,513,2

1,5

160

7830461614

4,544

'/|6"X90°1622

11,517,5

132,0

200

8836501817

4,544

i/i e" x 90°2024142013

2,5

250

10844582121

4,555

/i6"x90°26301524

14,54,5

315

13444582121

4,555

i/i e" x 90°26301524

14,55,8

Type SP-WB TypeSP-WBS Type SP-GPS

Soft top jaws type SP-WB are used for accurate work, turnedwith a set clamping pressure. The jaws are turned in posi-tion on the machine to the required component diameter.The grade of steel used permits subsequent hardening orwelding.

Special jaws of any design (e.g. hardened prism jaw type'SP-GPS), as used in 2-jaw chucks, can be made and suppliedon request according to specific components or drawingssubmitted.

Top jaws

U.L.

Soft top jaws type SP-WB125 160 200 250 315

T-nuts and bolts type SP-NST125 160 200 250 015

AВСDEFGHJКLkg

68304011

4,5'/1б"х90°

2918

8,413,513,2

1,5

355014

4,5i/i e" X 90°

3825

11,517,5

133,0

98355017

4,55"X90°

4429142013

4,0

108507021

4,5'/i e" X 90°

50301524

14,57,0

120507021

4,5'/1б"х90°

62301524

14,58,1

AВсI)E

21,5161114

M 8X30

26,5201417

M10X35

27,5231718

M12X35

30282119

M 14X40

30282119

M14X40

We reserve the right to change the above datain the interests of progress.

Applications

Manufacture and Testing

Piston milling on Programme-controlled Milling Machine withhighly accurate indexing table

Grinding of base jaw guideson a Special Purpose Vertical

Grinding Machine

Inspection on a DynamicBalancing Machine

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The problem of air feed is solved by using a stationaryfloating Distributor Ring with Circular Sealing Rings. It iscentralized by a resin based Centering Ring. Through airfeed holes in the Circular Sealing Rings air flows into oneof the two pressure chambers. The twin non-return valvecontrols the air flow to one pressure chamber simultaneouslybleeding the other chamber. The piston is forced forwardby air pressure in the chamber and actuates the master jawin a radial direction by means of the double-wedge action.The pneumatic pressure in the chuck is cut off from theline supply by the non-return valve and remains in the chuck(selfsustained clamping) until the control signals the chuckto open. The Circular Sealing Rings are lifted from the chuck

body while it is running by the release of air pressure whichis made possible by bleeding the supply hose. This actionprotects the Circular Sealing Rings against wear.

Life, concentricity, and clamping force of the SMW PowerChucks, Type SP are maintained by using high grade ma-terials, modern production methods and careful inspection.Chuck body and piston are drop-forged, the jaw guide waysinduction hardened and ground. The master jaws, the har-dened reversible jaws, piston and guide bushings are case-hardened and ground. The finished chuck is dynamicallybalanced.

Mounting to spindle nose locations

The various internationally used spindle nose locations re-quire different mountings, some important types are de-picted below.The various adaptor plates which are required for chuckswhich cannot be mounted directly, are finish turned to suitthe machine spindle nose. On the chuck side the flangesare pre-turned plus an allowance of 0.5 mm so that theymay be finish turned when mounted to ensure absoluteconcentricity.

It is possible to change the Back Location Plate of SMWType SP Chucks from one type of register to another. Thisfacilitates the use of SMW Chucks on machines with diffe-rent spindle nose locations. Back location plates withvarious registers are always available from stock.

Direct mounting in accordance with British Standard Spindle^rFlanges No. BS 739 can also be supplied.

ASA В 5.9 Type A1and DIN 55026 withintermediate flange(old DIN 55021)

DIN 55027 Bayonetdisc locking,direct mounting(old DIN 55022)

ASA В 5.9 Type D1 andCamlock lockingDIN 55029,direct mounting.

ASA В 5.9 Type Llong taper locking,mounting only withintermediate flange

Controls

PSS10

F 2 / U 2 / U N

Three control units are available for SMW Power ChuckTypeSP:

Electro pneumatic control Type SP-EDE 38Electro-magnetic manual control unit, 220 V- 50 Hz or110 V-60 Hz. Includes, in one unit, push buttons (open & close), airfilter, regulator, pressure gauge and lubricator. Plug in terminalfor spindle safety interlock is standard. A second terminal, forwiring to remote control by foot pedal (SMW type F2/U2/UN)or additional push buttons, is also included. Push buttons (orfoot switch) must be depressed manually until chuck hascompleted its cycle. Maximum recommended air pressure is145 p.s.i. Pneumatic fittings are R %".

The SP-EDE 38 control unit coupled with the design featuresof the SP chuck (i.e. clamping pressure retained in the en-closed cylinder and the self-locking double wedged piston)meets the high safety standards of the supervising authori-ties.

The electro pneumatic safety control unit type PSS 10 (max.8 bar) incorporates a pressure control switch which ensuresthat the system is only operational at a pre-set working pres-sure. The unit includes a pressure regulator, 2 solenoids, 2airflow sensors and 2 transducers.

The sensors monitor the flow of air to the chuck and the stopin airflow after the clamping cycle is complete. The changein airflow and the corresponding change in voltage of the

sensors is evaluated by transducers which activate the sole-noids interlocked to the spindle start control.

The PSS 10 control is operated by a short impulse via a foot-switch and is electrically isolated during spindle rotation toprevent accidental unclamping. Furthermore the starting of thespindle during a clamp or unclamp cycle is prevented.

Voltages: 220 V/ 50 Hz, 110 V/ 60 Hz or 24 V. Pneumatic fittingsare %".

The SMW electro pneumatic control unit type SP-EPK-10-24,up to 10 bar, meets all the regulations as defined by the safetystandard authorities. This system is contained within 2 panelswhich include all the controls, valves, and monitoring devices.The unit is complete with 8 metres of cable for interface to themachine, 3 indicator lights and a clamping pressure gauge.24 V supply and R Ул" pneumatic fittings.

The following functions are assured:

The actuation of the chuck is guaranteed by flow switcheslocated inside the control unit. The safety control unit is ope-rated by short impulse via hand or foot controlled impulsegenerator and contains: control valve for imput pressure, airfilter, pressure regulator, lubricator, switch for external or inter-nal clamping, option for power or manual clamping, indicatorlights for monitoring pressure, clamping cycle and spindlerelease. The unit itself is also electrically isolated duringspindle run and during the clamping cycle.

SP-EDE-38-220 SP-EPK-10-24

SOfAK KIRSTEIfiTECHNIK

CZ - 613 00 BRNO, Mertiautova 20| Tel.: 00420-5-4521 1666, Fax: -5-4521 1275

E-mail: lnfo@sktechnik.czhttp://www.sktechnik.cz

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i Phone (0 11) 9 63 20 20-9 63 21 21| Fax (011) 9632288i Telex210324AUTOK

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| Nagoya

i!!:!!!=!ll!![:!H!!j-ilfEiil! Fax (o 52) 5 04-02 05

U.S.A.

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