Service manual BIG BORE - SMW Autoblok

2001-09-E 

Contents 

EC manufacturer’s declaration 2 

General safety instructions 3 

Technical details BB-N 4-63 

Technical details BB-N-ES 7-9 

Description of function 10-11 

Installation 12 

Operation 13 

Maintenance 14 

Top jaws 14 

Disassembling 14 

Assembling 15 

Trouble shooting 15 

Spare parts 15 

Control units 16-21 

Thank you for purchasing an original SMW self-contained 

frontend power chuck type Big Bore. 

This service manual contains the installation, the use and 

the maintenance of the self-contained frontend power 

chuck type Big Bore. 

SMW-AUTOBLOK reserves the right to make changes 

without notice. 

This service manual may not be, in whole or in part, 

copied without our written agreement. 

The service manual is a part of the self-contained 

frontend power chuck type Big Bore and must be passed 

to the new owner in case of sale. 

Service manual 

BIG BORE 

SERVICE MANUAL 

Please note especially the sections which are marked 

with the following signs: 

WARNING! 

ATTENTION! 

Please read the service manual carefully 

before installation and use and always 

follow the regulations. 

Danger of injury or danger to life if 

instructions are not followed. 

Danger of damage to the machine, the 

power chuck or the components. 

SMW-AUTOBLOK 1

2 SMW-AUTOBLOK 

Manufacturer’s declaration 

MANUFACTURER’S DECLARATON 

according to machine specification 89/392/EC appendix II paragraph B 

SMW-AUTOBLOK Spannsysteme GmbH declares that the component described following is 

designed for the use on a machine. It is prohibited to operated the component until it is certain 

that the machine in which the component is installed is in accordance with the regulations of 

the EC-rule i.d.F. 91/368/EWG. 

Important: The operation of the self-contained frontend power chuck type Big Bore is allowed 

only if suitable safety control units with airflow sensors, pressure gauges as well as pressure control 

during rotation are installed. Different from standard power chucks the jaw stroke of Big 

Bore air chucks is not controlled by proximity switches. The resulting remaining risks must be 

covered by suitable protections and covers on the machine. 

Component: Self-contained frontend power chuck 

Application: Installation in machine tool 

Type: Big Bore 

Applied harmonized norms: DIN EN 1550 

Signature of responsible person

General safety instructions 

1. Correct use 

SMW-AUTOBLOK self-contained frontend 

power chucks work safely and troublefree if 

WARNING! they are used according to their specification, 

i.e. to clamp components on the outside diameter on turning 

machines. 

Any other use can cause hazards. 

WARNING! 

2. Personnel 

Self-contained frontend power chucks must be 

installed, operated and maintained by qualified 

and regularly trained personnel only. 

3. Safety precautions 

During the machining process the self-contained 

frontend power chuck and the clamped 

WARNING! 

component must be protected by suitable 

safety guards mounted to the machine. 

The machine door must be locked closed until the machine 

spindle arrives to its full stop. Actuation of the power chuck 

must be possible at stopped spindle only! Set-up works, 

maintenance and all other mechanical work must be done 

at safe spindle stop only! 

WARNING! 

4. Technical details 

The max. data as max. pressure p and max. 

spindle speed n are engraved on the chuck 

body. They must not be exceeded in any case. 

5. Maximum speed 

The max. speed is only allowed at an actuating 

force of min. 6 bar. The jaws that are used 

ATTENTION! 

must be the corresponding hard reversible 

stepped jaws that radially do not exceed the chuck outside 

diameter. If, for special applications, special top jaws are 

used the clamping force and the max. speed must be calculated 

according to VDI 3106, but not exceeding the max. 

permitted speed of the chuck. Especially heavy special top 

jaws have a big influence on the max. speed. During the 

machining process the centrifugal force increases or 

decreases the gripping force. O.d. clamping = decreasing, 

i.d. clamping = increasing. All theoretically calculated 

values must be double checked with a suitable dynamic 

gripmeter. We recommend to use our dynamic gripmeter 

type DGM 270. 

6. Remaining risks 

The type of component (shape, weight, unbalance, 

material etc.) has a big influence on the 

ATTENTION! 

system machine tool - power chuck - component. 

For that reason there is always a residual risk. These 

residual risks must be calculated by the user and must be 

eliminated by suitable actions. 

GENERAL SAFETY INSTRUCTIONS 

7. Top jaws 

Always use original-SMW-AUTOBLOK-top 

jaws only. Jaws of other manufacturers can 

ATTENTION! cause damage to the chuck or accidents. Top 

jaws must be mounted with head socket screws of 

quality class 12.9 only! 

Tighten all mounting bolts with a specified torque. Always 

ensure sufficient length of the engagement (min. 1,25 x 

thread diameter)! 

If the jaw height of special jaws exceeds the height of the 

standard jaws the max. actuating force of the chuck must 

be reduced in order to avoid an excessive lever action and 

thus damage to the power chuck. 

At reduced actuating force the max. speed must also 

be reduced accordingly! 

8. Maintenance 

The self-contained frontend power chuck must 

be maintained in regular intervals according to 

WARNING! 

the specification. Check the sealness and the 

clamping force of both cylinder chambers with a static 

gripforce meter regularly. 

Replace damage parts with original SMW-AUTOBLOK 

spare parts only! 

Maintenance must only be carried out at safe spindle stop 

of the machine! 

The actuation of the self-contained frontend 

power chuck must be only be carried out by 

suitable safety control units with airflow sen- 

WARNING! sors, pressure gauges and pressure control 

which are in accordance with all valid safety regulations. 

Important: On chucks type BB-N and BB-N-ES the jaw 

stroke and the clamping pressure is monitored indirectly 

when the machine spindle is stopped and the 

airflow to actuate the chucks is monitored by airflow 

sensors and pressure gauges. 

After that the clamping pressure remains trapped in 

the cylinder chamber. During rotation of the spindle 

the air pressure is switched off and disconnected from 

the chuck! When using the safety control unit ACU-NT 

with the option pressure control on chuck o.d. clamping 

the clamping pressure in the chuck chamber for 

o.d. clamping can be monitored. 

Herefore the pressure control on the chuck must be 

adjusted according to the present clamping pressure 

used on the chuck (valid for chucks type BB-N and BB- 

N-ES). On the chuck type BB-N-ES the safety control 

unit ACU-NT with the option rapid stroke control 

allows to monitor that the chuck does not clamp the 

component on the rapid stroke (it is not allowed to 

clamp components on the rapid stroke!) 

Remaining risks must be covered by suitable actions 

and suitable safety guards on the machine. 

In case of doubts or questions please ask SMW-AUTO- 

BLOK or one of our authorized offices. 


Subject to technical changes 


NEW 

TECHNICAL DETAILS 

SMW-AUTOBLOK BIG BORE BB-N 400-140 BB-N 460-181 BB-N 500-205 BB-N 500-230 BB-N 630-310 BB-N 800-410 BB-N 1000-534 

Id.No. 052300 052887 052318 052340 052534 052347 052650 

Mounting Z 310 Z 310 Z 415 Z 415 Z 510 Z 700 Z 700 

A mm 422 467 540 570 662 800 1000 

B mm 140 181 205 230 310 410 534 

C mm 467 467 570 570 685 850 925 

D H6 mm 310 310 415 415 510 700 700 

E mm 400 400 500 500 610 775 850 

Fixing bolts circle F mm 374 374 474 474 580 745 815 

G mm M12 M12 M12 M12 M16 M16 M16 

G1 mm 26 26 26 26 30 30 30 

H mm 196 196 225 225 263 305 332 

H1 mm 194 194 223 223 261 303 330 

J mm 8 8 8 8 8 8 10 

Thread circle 6x M8 / 6x UNC K mm 448 448 550 550 666 830 910 

L mm 20 20 20 20 20 25 33 

M mm 70 - 98 98 115 154 224 

Pneumatic connection N inch R 3/8" R 3/8" R 3/8" R 3/8" R 3/8" R 3/8" R 3/8" 

O mm 37 37 37 37 39,5 44,5 52,5 

P mm 26 26 26 26 33 33 33 

R mm 35 35 35 35 42 35 42 

S mm 374 374 474 475 575 745 815 

a mm 57 57 57 57 75 75 75 

b mm 25,5 25,5 25,5 25,5 30 30 30 

Serration c inch 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 

Bolt DIN 912 12.9 d mm M20 M20 M20 M20 M24 M24 M24 

min. e mm 13 13 14 14 16 16 16 

T-nuts distance min./max. f mm 38/85 38/85 38/102 38/102 47/103 47/130 47/148 

Serration length g mm 117,5 117 138 138 142 171,5 188 

min./max. h mm 94,5/101,5 112/119 133,5/142 143,5/152 190,5/200,5 243/255 311/323,5 

α° 20 20 15 15 15 15 15 

β° 9 x 40 9 x 40 12 x 30 12 x 30 12 x 30 12 x 30 12 x 30 

γ° 37 83 60 60 60 60 60

GUB Hard reversible 

top jaws 

Gripping ranges 

GAB Hard top jaws 


WBC Soft top jaws 



Chuck BB-N 400-140 BB-N 460-181 BB-N 500-205 BB-N 500-230 BB-N 630-310 BB-N 800-410 BB-N 1000-534 

Jaw type GUB 500 GUB 500 GUB 500 GUB 500 GUB 630 GUB 800 GUB 800 

Id.No. 12085046 12085046 12085046 12085046 12086446 12088046 12088046 

B 55 55 55 55 75 75 75 

H 73 73 73 73 85 85 85 

L 145 145 145 145 160 220 220 

T 32 32 32 32 30 30 30 

N 25,5 25,5 25,5 25,5 30 30 30 

Serration 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 

a 46 46 46 46 30 51 51 

b 38 38 38 38 50 62 62 

c 38 38 38 38 50 62 62 

kg/set 6,6 6,6 6,6 6,6 13,5 19,5 19,5 

A1 65-238 100-273 150-358 175-378 275-485 320-590 450-760 

A2 110-284 145-320 200-405 225-425 275-485 330-600 460-770 

A3 294-470 330-505 385-590 410-610 475-685 590-865 725-1030 

S 585 620 705 725 820 1050 1225 


Jaw type GAB 500 GAB 500 GAB 500 GAB 500 GAB 630 GAB 800 GAB 800 

Id.No. 12085146 12085146 12085146 12085146 12086546 12089046 12089046 

B 55 55 55 55 75 75 75 

H 73 73 73 73 82 82 82 

L 195 195 195 195 245 320 320 

N 25,5 25,5 25,5 25,5 30 30 30 


a 96 96 96 96 113 165 165 

b 38 38 38 38 50 60 60 

c 38 38 38 38 50 60 60 

kg/set 16,5 16,5 16,5 16,5 31,5 40,5 40,5 

A1 25-140 60-175 50-260 70-280 105-320 95-365 225-535 

S 585 620 705 725 820 1010 1180 


Jaw type WBC 500 WBC 500 WBC 500 WBC 500 WBC 630 WBC 800 WBC 800 

Id.No. 12075050 12075050 12075050 12075050 12076440 12078040 12078040 

B 60 60 60 60 80 80 80 

H 60 60 60 60 80 80 80 

L 170 170 170 170 240 320 320 

N 25,5 25,5 25,5 25,5 30 30 30 


a 69 69 69 69 110 165 165 

b 38 38 38 38 50 60 60 

kg/pc. 4,5 4,5 4,5 4,5 11 15 15 

A1 25-195 60-230 105-315 125-325 110-325 95-365 225-535 

S 545 580 660 680 815 1010 1180 


WBCL Soft top jaws 

long version 

N 

c 





Jaw type WBCL 500 WBCL 500 WBCL 500 WBCL 500 WBCL 630 WBCL 800 WBCL 800 

Id.No. 12075140 12075140 12075140 12075140 12078040 12079040 12079040 

B 60 60 60 60 80 80 80 

H 60 60 60 60 80 80 80 

L 205 205 205 205 320 390 390 

N 25,5 25,5 25,5 25,5 30 30 30 


a 104 104 104 104 165 230 230 

b 38 38 38 38 60 60 60 

c 38 38 38 38 60 60 60 

kg/pc. 5,5 5,5 5,5 5,5 15 18 18 

A1 - 0-155 35-245 55-265 25-195 25-235 95-405 

S - 575 660 680 845 1020 1190 

NST T-nuts Chuck BB-N 400-140 BB-N 460-181 BB-N 500-205 BB-N 500-230 BB-N 630-310 BB-N 800-410 BB-N 1000-534 

Type NST NST NST NST NST NST NST 

Id.No. 12065020 12065020 12065020 12065020 13063900 13063900 13063900 

N 25,5 25,5 25,5 25,5 30 30 30 

H 34 34 34 34 44 44 44 

h 15 15 15 15 18 18 18 

G M20 M20 M20 M20 M24 M24 M24 

Bolt M20 x 40 M20 x 40 M20 x 40 M20 x 40 M24 x 60 M24 x 60 M24 x 60 

DIN 912 12.9 

Tighten 

torque 300 300 300 300 450 450 450 

Md max (Nm) 

Adapters for BIG BORE chucks 

ISO-A 

DIN 55026 

mounting 

adapters 

b 

L 

a 

B 

H 

BB-N 400-140/460-181 500-205/500-230 630-310 800-410 1000-534 

Spindle nose A8 A11 A15 A11 A15 A20 A11 A15 A20 A15 A20 A15 A20 

Id.No. 24184020 24114020 24124020 24115030 24125020 24175020 24116320 24126320 24176320 24128020 24178020 24128020 24178020 

A mm 46 46 46 46 46 46 56 56 56 56 56 56 56 

B mm 139,719 196,869 285,775 196,869 285,775 412,775 196,869 285,775 412,775 285,775 412,775 265,775 412,775 

C mm 171,4 235 330,2 235 330,2 463,6 235 330,2 463,6 330,2 463,6 330,2 463 

Bayonet and camlock flanges are available on request

Subject to technical changes 

NEW 


SMW-AUTOBLOK BIG BORE ES Type BB-N ES 400-140 BB-N ES 460-181 BB-N ES 500-205 BB-N ES 500-230 BB-N ES 630-325 BB-N ES 850-375 BB-N ES 1000-560 

Id.No. 052330 052838 052651 052652 052653 052654 052655 

Mounting Z 310 Z 310 Z 415 Z 415 Z 510 Z 700 Z 700 

A mm 467 467 570 570 685 850 1000 

B mm 140 181 205 230 325 375 560 

C mm 467 467 570 570 685 850 925 

D H6 mm 310 310 415 415 510 700 700 

E mm 400 400 500 500 610 775 850 

Fixing bolts circle F mm 374 374 474 474 580 745 815 

G mm M12 M12 M12 M12 M16 M16 M16 

G1 mm 26 26 26 26 30 30 30 

H mm 240 240 282 282 307,5 354 332 

H1 mm 238 238 280 280 305,5 352 330 

J mm 8 8 8 8 8 8 10 

Thread circle 6x M8 / 6x UNC K mm 448 448 550 550 666 830 910 

L mm 20 20 20 20 20 25 33 

M mm - - - - - - 224 

Pneumatic connection N inch R 3/8" R 3/8" R 3/8" R 3/8" R 3/8" R 3/8" R 3/8" 

O mm 37 37 37 37 39,5 44,5 52,5 

P mm 26 26 26 26 33 33 33 

R mm 35 35 35 35 42 35 42 

S mm 374 374 474 474 575 745 815 

T mm 35 35 35 35 35 35 35 

U mm 374 374 474 474 580 745 905 

a mm 57 57 57 57 75 75 75 

b mm 25,5 25,5 25,5 25,5 30 30 30 

Serration c inch 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 3/32" x 90° 

Bolt DIN 912 12.9 d mm M20 M20 M20 M20 M24 M24 M24 

min. e mm 14 14 14 14 16 16 16 

T-nuts distance min./max. f mm 38/90 38/75 38/104 38/92 47/100 47/140 47/125 

Serration length g mm 121 106 140 127,5 138 182 166 

min./max. h mm 124 141,5 170 182,5 230 268 360 

α° 20 20 15 15 15 15 15 

β° 9 x 40 9 x 40 12 x 30 12 x 30 12 x 30 12 x 30 12 x 30 

γ° 83 83 60 60 60 60 60 


GUB Hard reversible 

top jaws 




Chuck BB-N ES 400-140 BB-N ES 460-181 BB-N ES 500-205 BB-N ES 500-230 BB-N ES 630-325 BB-N ES 850-375 BB-N ES1000-560 

Jaw type GUB 500 GUB 500 GUB 500 GUB 500 GUB 630 GUB 800 GUB 800 

Id.No. 12085046 12085046 12085046 12085046 12086446 12088046 12088046 

B 55 55 55 55 75 75 75 

H 73 73 73 73 85 85 85 

L 145 145 145 145 160 220 220 

T 32 32 32 32 30 30 30 

N 25,5 25,5 25,5 25,5 30 30 30 


a 46 46 46 46 30 51 51 

b 38 38 38 38 50 62 62 

c 38 38 38 38 50 62 62 

kg/set 6,6 6,6 6,6 6,6 13,5 19,5 19,5 

A1 78-264 113-270 175-388 200-388 295-500 320-610 470-760 

A2 125-310 160-315 225-435 250-435 295-500 330-620 480-770 

A3 310-495 345-500 410-620 435-620 495-700 590-865 745-1030 

S 635 640 765 765 870 1070 1250 

GAB Hard top jaws Chuck BB-N ES 400-140 BB-N ES 460-181 BB-N ES 500-205 BB-N ES 500-230 BB-N ES 630-325 BB-N ES 850-375 BB-N ES1000-560 

Jaw type GAB 500 GAB 500 GAB 500 GAB 500 GAB 630 GAB 800 GAB 800 

Id.No. 12085146 12085146 12085146 12085146 12086546 12089046 12089046 

B 55 55 55 55 75 75 75 

H 73 73 73 73 82 82 82 

L 195 195 195 195 245 320 320 

N 25,5 25,5 25,5 25,5 30 30 30 


a 96 96 96 96 113 165 165 

b 38 38 38 38 50 60 60 


c 

kg/set 

38 

16,5 

38 

16,5 

38 

16,5 

38 

16,5 

50 

31,5 

60 

40,5 

60 

40,5 

A1 25-160 60-165 75-290 100-290 130-335 95-385 245-535 

S 635 640 765 765 870 1060 1210 

WBC Soft top jaws Chuck BB-N ES 400-140 BB-N ES 460-181 BB-N ES 500-205 BB-N ES 500-230 BB-N ES 630-325 BB-N ES 850-375 BB-N ES1000-560 

Jaw type WBC 500 WBC 500 WBC 500 WBC 500 WBC 630 WBC 800 WBC 800 

Id.No. 12075050 12075050 12075050 12075050 12076440 12078040 12078040 

B 60 60 60 60 80 80 80 

H 60 60 60 60 80 80 80 

L 170 170 170 170 240 320 320 

N 25,5 25,5 25,5 25,5 30 30 30 


a 69 69 69 69 110 165 165 

b 38 38 38 38 50 60 60 

kg/pc. 4,5 4,5 4,5 4,5 11 15 15 


A1 35-220 70-225 130-335 155-335 135-340 95-385 245-535 

S 590 595 720 720 865 1060 1210

WBCL Soft top jaws 

long version 

N 

c 

Gripping range 


Chuck BB-N ES 400-140 BB-N ES 460-181 BB-N ES 500-205 BB-N ES 500-230 BB-N ES 630-325 BB-N ES 850-375 BB-N ES1000-560 

Jaw type WBCL 500 WBCL 500 WBCL 500 WBCL 500 WBCL 630 WBCL 800 WBCL 800 

Id.No. 12075140 12075140 12075140 12075140 12078040 12079040 12079040 

B 60 60 60 60 80 80 80 

H 60 60 60 60 80 80 80 

L 205 205 205 205 320 390 390 

N 25,5 25,5 25,5 25,5 30 30 30 


a 104 104 104 104 165 230 230 

b 38 38 38 38 60 60 60 

c 38 38 38 38 60 60 60 

kg/pc. 5,5 5,5 5,5 5,5 15 18 18 

A1 - 0-150 60-275 85-275 25-210 25-255 115-405 

S - 595 720 720 895 1070 1220 

NST T-nuts Chuck BB-N ES 400-140 BB-N ES 460-181 BB-N ES 500-205 BB-N ES 500-230 BB-N ES 630-325 BB-N ES 850-375 BB-N ES1000-560 

Type NST NST NST NST NST NST NST 

Id.No. 12065020 12065020 12065020 12065020 13063900 13063900 13063900 

N 25,5 25,5 25,5 25,5 30 30 30 

H 34 34 34 34 44 44 44 

h 15 15 15 15 18 18 18 

G M 20 M 20 M 20 M 20 M 24 M24 M 24 

Bolt M20 x 40 M20 x 40 M20 x 40 M20 x 40 M24 x 60 M24 x 60 M24 x 60 

DIN 912 12.9 

Tighten 

torque 300 300 300 300 450 450 450 

Md max (Nm) 

Adapters for BB-N-ES chucks 

ISO-A 

DIN 55026 

mounting 

adapters 

b 

L 

a 

B 

H 

BB-N ES 400-140/460-181 500-205/500-230 630-310 850-375 1000-534 

Spindle nose A8 A11 A15 A11 A15 A20 A11 A15 A20 A15 A20 A15 A20 

Id.No. 24184020 24114020 24124020 24115030 24125020 24175020 24116320 24126320 24176320 24128020 24178020 24128020 24178020 

A mm 46 46 46 46 46 46 56 56 56 56 56 56 56 

B mm 139,719 196,869 285,775 196,869 285,775 412,775 196,869 285,775 412,775 285,775 412,775 265,775 412,775 

C mm 171,4 235 330,2 235 330,2 463,6 235 330,2 463,6 330,2 463,6 330,2 463,6 

Bayonet and camlock flanges are available on request 


1. Description of function 

1.1 General function 

Self-contained frontend power chucks type BIG BORE are 

wedge hook chucks with large through hole with an integrated 

pneumatic actuating cylinder. The main use is clamping of 

tubes. 

The clamping/unclamping is done at stopped spindle by 

filling/exhausting the cylinder chambers with compressed air. 

The air must be cleaned and lubricated with a suitable 

air service unit with a filter, dryer and oiler. Actuation is 

done by an air distribution system which is mounted stationary 

on the headstock of the machine. When the correct clamping 

pressure in the cylinder chamber is reached the mounted 

safety control unit stops the airflow and disconnects the air 

distributor from the chuck. The clamping pressure is trapped in 

the cylinder chamber by a non-return valve. 

1.2 Air distribution system (pic. 1) 

The air for actuation is transmitted through the air distributor 

ring and the mounted profile seals to the chuck at stopped 

spindle only. The profile seals are designed so that the outside 

surface is bigger than the inside surface. When the profile seal 

is pressurized the bigger outside surface causes a radial deformation 

of the profile seals inwards until they are in full contact 

with the outside diameter of the chuck body. Now the profile 

seals seal all around the outside dia. of the chuck body and the 

air flows through the small holes of the profile seals into the 

corresponding chuck chamber. 


pic. 1 

When the airflow is stopped the elasticly free loaded profile 

seals lift completely off the chuck body and thus cannot wear 

out during rotation of the chuck. The air of the non-pressurized 

chamber exhausts mainly directly through the gap between 

the air distributor ring/profile seal and the chuck body. 

DESCRIPTION OF FUNCTION 

1.3 Safety non-return valve (pic. 2) 

The safety non-return valve is a brass valve body including 2 

steel sealing pistons. It is easily accessible through a plug on 

the face of the chuck. It guides the airflow from the profile 

seals through the channels to the corresponding chuck chamber. 

By pressurizing the different profile seals the clamping 

pressure is guided to the corresponding clamping chamber 

and in the same movement the other chamber can exhausts 

the air through the other side of the safety valve. As the safety 

valve acts like a shuttle valve any actuation causes a movement 

of the entire assembly in the ball of the chuck body. This 

allows to have the function for pressurizing the clamping 

chamber and exhausting the other chamber in one motion 

(see also page 11, pic. 2).

1.4 Jaw drive 

brass valve body 

steel sealing piston in 

“exhaust” position 

to cylinder chamber I 

The self-centering jaw drive on all 3 master jaws is ensured by 

a piston with a wedge hook machined into the piston collar. 

The force transmission is done by the 10° wedge hook from 

the piston to the master jaws. 

piston with wedge hook 

from cylinder chamber II 

from distributor ring to distributor ring 

steel sealing piston 

in “seal position” 

DESCRIPTION OF FUNCTION 

pic. 2 

The clamping forces are taken by the piston collar and are radially 

supported in the piston guide of the chuck body. The 

pneumatic actuation is done on to the piston cover that is bolted 

on to the piston in the pneumatic part of the chuck. 

pressurized chamber 

for o.d. clamping 

pressurized chamber 

for unclamping 

plug 

axial force 

force transmission 

piston guide 

on guide bush 

clamping force 

self-centering jaw drive of selfcontained 

frontend power chuck 

pic. 3 

master jaw 

piston collar 

piston guide 

piston cover 


2. INSTALLATION 

prox. switch M12x1 

(Illustration without pressure control and 

without rapid stroke control) 

back plate 

bracket 

SMW profile seal 


DRMB 

distributor ring 

labyrinth gap 1,5 mm 

seal disc 

grease nipple 

air connection 

bolt 

T-nut 

master jaw 

piston cover 

guide bush 

piston 

cap 

chuck body 

pic. 4 

distributor ring 

labyrinth gap 

pic. 5 

safety non-return valve 

2.1 Distributor ring (see pic. 4) 

INSTALLATION 

The distributor ring must be mounted stationary onto the headstock of 

the spindle without any contact to the chuck. The distributor ring is 

a separate stationary part which is mounted with the distributor ring 

mounting bracket (DRMB) to the headstock of the machine and has to 

be held rigidly in axial and radial position. It can be centred and mounted 

on the cover of the front spindle bearing. Always reconfirm with 

the machine manufacturer for the best place for mounting the DRMB. 

The DRMB must have a large hole on the bottom in order to 

ATTENTION! allow coolant and exhaust air to escape! 

The brackets for the proximity switches for the pressure control and 

for the rapid stroke control can also be mounted onto the DRMB. 

2.2 Mounting to the machine spindle 

2.2.1 Mount chuck adapter plate with mounting bolts onto the 

machine spindle, and finish machine if necessary. Always apply correct 

torque to the machine mounting bolts. 

2.2.2 Bolt DRMB and distributor ring together, and mount onto 

the machine (see pic. 4). 

2.2.3 Lift the chuck with suitable lifting equipment (eyebolt) and 

mount carefully onto the machine. Be sure not to damage the distributor 

ring and the profile seals. 

2.2.4 Insert chuck mounting bolts, mount the chuck to the chuck 

adapter plate and check concentricity. 

2.2.5 Adjust labyrinth gap (1,5 mm = 0,059”) with thickness gage, 

and adjust concentricity of the distributor ring with dial indicator. 

2.2.6 Tighten all bolts with correct torque. 

2.2.7 Connect hoses for clamp and unclamp and check function 

and sealness. 

2.2.8 Insert gripmeter into the chuck and check grip force. 

Leave the grip force meter clamped for at least 1 hour 

WARNING! 

to ensure the chuck holds the grip force properly. 

2.3 Adjustment of proximity switch for pressure 

control 

2.3.1 Set the air control unit ACU-NT to adjustment mode (see 

manual ACU-NT page 14, 6.6). 

2.3.2 Orientate chuck so that the switch ring of the pressure control 

is underneath the slot where the proximity switch for the pressure 

control is mounted. Mount the proximity switch to the bracket and 

radially adjust to approx. 1 mm (0,039”) distance to the switch ring. 

2.3.3 Adjust the pressure control of the chuck to the requested 

min. pressure (see page 13, 3.3 and pic. 6, 7, 8, 9). 

2.3.4 Adjust axial position of the proximity switch, so that the 

proximity switch is actuated at low pressure or at position chuck 

open. At correct clamping there must be no alarm signal. 

2.4 Adjustment of proximity switch for rapid stroke 

control 

2.4.1 Set the air control unit ACU-NT to set-up mode for jaw 

movement (see manual ACU-NT page 14, 6.5). 

2.4.2 Orientate the chuck so that the switch ring for rapid stroke 

control is underneath the slot where the proximity switch for the 

rapid stroke control is mounted. Mount the proximity switch to the 

bracket and radially adjust to approx. 1 mm (0,039”) distance to the 

switch ring. 

2.4.3 Move the chuck master jaws to the position where the stroke 

changes from rapid stroke to clamping stroke. 

2.4.4 Adjust the axial position of the proximity switch so that at 

rapid stroke the proximity switch is actuated. At clamping stroke there 

must be no alarm signal.

3. Operation 

3.1 Operation 

3.1.1 Ensure that the self-contained frontend power chuck 

type Big Bore is well lubricated. If necessary relubricate on all grease 

nipples using original SMW-AUTOBLOK grease K05. Lubrication 

is done with closed jaws (all 3 jaws are in inward end position). A 

chuck that is not sufficiently lubricated does not offer full 

gripping force and causeS hazards! 

3.1.2 On the face of the chuck there is a plug with a 6 mm i.d. 

hex. Behind this plug the safety non return valve is mounted. It is 

important that the ball for the safety valve is slightly oiled so that 

the valve body can easily slight in the valve ball. 

Too much grease, dirt or chips in the ball of the safety valve 

can lock the safety valve or cause damage of the o-rings! 

WARNING! 

The air must be cleaned and lubricated with a suitable air 

service unit. Moisture or dirt can cause rust or contamina- 

WARNING! tion which can damage the seals of the chuck and thus 

can cause loss of clamping force. 

ATTENTION! 

Danger of loss of gripping force! 

Pressure control 

Monitoring of the clamping pressure on chuck o.d. clamping is possible 

with suitable safety control units only! (please refer to power 

safety control unit ACU-NT). 

3.2 Standard conditions 

The self-contained frontend power chucks type Big Bore are equipped 

with a pressure control for chuck o.d. clamping as a standard. 

This control contains the part 1, 2, 3 and 4 (see illustration below) 

and works as follows: 

The air pressure in chamber (S) creates a force on piston (4) that is 

equal or bigger than the counterforce created by the spring (1). This 

causes the switch ring (2) to move forward in working position (A). 

In this position the switch ring (2) can lock the proximity switch (3). 

standard setting 

Switch ring in position ok 

(for o.d. clamping only) 

Switch ring in alarm position 

low pressure in chuck chamber or jaws 

flush with chuck 

body 

pic. 6 

standard setting 

for 3 bar (43 psi) 

pic. 7 

OPERATION 

As the clamping pressure is correct no alarm signal is created and 

the machine spindle and the machining process can be started. In 

case the pressure in the clamping chamber for o.d. clamping drops 

below the preselected value correspondingly the pressure in chamber 

(S) is reduced. The lower pressure in chamber (S) causes a lower 

force against the tension of the spring (1). The spring causes the 

switch rod and thus the switch ring (2) to move backwards and thus 

creating an alarm signal by switching on the proximity switch (3). 

The signal of the proximity switch is detected by the built-in electronics 

of the ACU-NT and creates an alarm output signal which 

can be used to stop the machine spindle. 

3.3 Changing of the preset minimum pressure 

When the chuck is delivered from the factory a pressure control for 

o.d. clamping is set to a pressure of 3 bar (43 psi). In order to readjust 

this pressure following procedure is necessary: 

1. The chuck is clamped for o.d. clamping with a pressure that 

lateron is used as a clamping pressure to hold the part. 

2. Open counter nut (6) by 8 mm hex key. 

3. Readjust set screw (5) by 6 mm hex key until the pneumatic 

pressure in chamber (S) forces the switch ring to position A 11 

mm towards the backface of the chuck (see pic. 6). 

4. Tighten counternut (6) again. 

5. Open the chuck and reclamp for o.d. clamping with a pressure 

2 bar (29 psi) less then the initial pressure. Now switch ring (2) 

must reach the position 7 mm as shown in picture 7 as a maximum. 

In this position the switch ring creates an alarm signal as 

soon as the spindle starts rotating and the switch ring passes by 

the proximity switch. The built-in electronics in the ACU-NT 

detect the low pressure and create an alarm output signal. This 

can be used to stop the machine spindle. To check the function 

without rotating the spindle (rotating spindle by hand) the 

ACU-NT must be set to set-up mode (please refer to service and 

maintenance instruction of ACU-NT). 





pic. 8 

min. pressure set 

to 2 bar (29 psi) 

pic. 9 

min. pressure set 

to 4,5 bar 65 psi) 

assembly of pressure control 



4.1.1 Cleaning and lubrication of the chuck 

Constant clamping force, accuracy and service life of the chuck 

mainly depend on that the chuck is regularly cleaned and 

maintained. Rust, dust, chips and coolant increase the friction 

and thus increase wear of the chuck. Regular lubrication with 

SMW-AUTOBLOK K05 ensure high gripping force, accuracy 

and service life. 

4.1.2 Every 20-30 working hours the 3 grease nipples on 

the master jaws have to be lubricated with SMW-AUTOBLOK 

grease K05. After lubricating the chuck should be opened and 

closed 3 times without a clamped workpiece to spread the 

grease equally on all surfaces. 

4.1.3 Depending on the working conditions the 

safety valve has to be removed, cleaned and oiled 

minimum once per week. Also the ball of the 

WARNING! safety valve has to be cleaned and checked for 

damage. 

4.1.4 The serration of the master jaws and the top jaws 

must be cleaned when changing all repositioning jaws. 

4.1.5 Contamination of rust, dust, fine chips or coolant 

cannot be avoided, even if all gaps are sealed by very close 

tolerances. Therefore the chuck has to be disassembled and 

completely cleaned and relubricated max. every 6 months. In 

case of big amounts of dust or coolant contaminating the 

chuck this interval has to be shortened accordingly. 

4.2 Top jaws 

4.2.1 The fine serration of the master jaws and the top 

jaws on the Big Bore chucks is 3/32” x 90°. The increments 

from teeth to teeth are approx. 2.4 mm (approx. 3/32”). 

Please observe that the top jaws to clamp the components 

are positioned on the master jaws so that max. 2/3 

of the total jaw stroke are used to clamp the part (1/3 

remaining as remaining jaw stroke). Hard top jaws must 

only be used in sets (marked with 1, 2, 3). Please observe correct 

position of the top jaws 1, 2, 3 on the corresponding 

master jaws, to reach best concentricity. 

4.2.2 Machining of soft top jaws on the self-contained 

frontend power chuck type Big Bore must be done 

in the same clamping position using the same clamping 

pressure that will be used for the machining process 

afterwards. Please note that all mounting bolts must be 

tightened with a correct torque. 

4.2.3 When mounting hard or soft top jaws 

always use a torque wrench. Always tighten the 

mounting bolts with correct torque. Always use 

WARNING! 

mounting bolts with minimum quality class 10.9! 


MAINTENANCE / JAWS DISASSEMBLING 

5.1 Disassembling (for reference numbers please 

refer to page 15) 

5.1.1 Disconnect both fittings from distributor ring (4). 

Loose mounting bolts of distributor ring mounting bracket 

mounted to the machine headstock. Use eyebolt M12 or M16 

in radial eyebolt holes and engage suitable lifting equipment 

into crane. Loosen mounting bolts that hold the chuck on the 

adapter plate. Now take off the complete chuck assembly with 

a crane and place safely on a work bench. Please obersve 

hands and feet because chuck is very heavy. 

5.1.2 Disassemble profile seals (5 and 8) from distributor 

ring (4) and check for wear. If necessary replace by new original 

SMW-AUTOBLOK profile seals. If the profile seals are not 

worn out clean and grease slightly. When reassembling the 

profile seals to the air dsitributor ring ensure that the small 

holes in the profile seals are as far as possible away from the 

pneumatic fittings of the distributor ring. 

5.1.3 Take out safety non-return valve (10) by opening plug 

(9) with o-ring (39) carefully. 

Attention: The chuck is still pressurized! 

Please use clothrag to cover and protect yourself 

during disassembling the safety nonreturn 

valve. 

WARNING! It is absolutely necessary to take off the 

safety non-return valve before continuing 

any other disassembling! 

Check all parts and o-rings of the valve system for 

wear or damage, and replace if necessary! 

5.1.4 When the safety valve is disassembled from the 

chuck the backplate (12) with the o-rings (34, 35) can be disassembled 

by loosening the head socket screws (11). Before 

removing the backplate disassemble the switch rings for pressure 

control and stroke control. 

5.1.5 Open head socket screws (13) which hold the piston 

cover (14) onto the piston (21). 

5.1.6 Use 2 of the screws in the 2 tapped holes in the 

piston cover (14) to lift the piston cover (14) off the piston (21). 

5.1.7 Open the head socket screws (15) of the guide bush 

(16) and disassemble the guide bush (16) by pushing towards 

the front. 

5.1.8 Open head socket screws (17 or 17.1) and remove 

sealing disc (19 or 19.1) and take out the o-ring (20 or 20.1). 

Attention: On older chucks there can be washers underneath 

the heads of the bolts. Please do not loose them! 

5.1.9 The piston (21) can now be removed from the chuck 

body (23). Also the master jaws (22) can be slided out radially 

towards the center of the chuck. The jaws as well as the piston 

are marked with 1,2,3. When reassembling please observe correct 

position in chuck body. 

5.1.10 Clean all parts of the chuck with suitable cleaning 

liquid and dry. Always observe all safety regulations. Please 

check all parts for wear or damage and replace if necessary. 

We recommend to use a new seal kit and replace all o-rings 

before reassembling the chuck. All o-rings and parts in the 

pneumatic part must be oiled, all parts in the mechanical part 

(piston and master jaws) must be lubricated with SMW-AUTO- 

BLOK grease K05. 

Please note that the seal in the sealing disc (part 32) in the 

chuck is a Teflon seal. Normally this seal does not have to be 

changed. In case it is damaged, a o-ring in the seal kit replaces 

the Teflon seal and its o-ring!

5.2 Reassembling 

5.2.1 Lubricate master jaws and piston with SMW-AUTO- 

BLOK grease K05. Insert master jaws (22) into the corresponding 

guideways of the chuck body (23). Mount the o-ring (33) 

into the piston (21). Slide in the piston with a wedge hook into 

the wedge hook of the master jaws (22) up to the frontend 

position. Please observe marking 1, 2, 3 on chuck body (23), 

piston (21) and master jaws (22). 

5.2.2 Reinsert o-ring (20 or 20.1) into sealing disc (19 or 

19.1), and mount together with O-ring (32) into the chuck 

body. Use head socket screws (17) to bolt in the sealing disc 

(19 or 19.1) into the chuck body (23). On older version chucks 

do not forget the washers underneath the heads of the screw! 

5.2.3 Slide in guide bush (16) from the frontside into the 

chuck and screw-in 3 screws (15). 

5.2.4 Insert piston cover (14) with the o-rings (31, 36) and 

mount with head socket screws (13) to the piston (21). 

5.2.5 Put backplate (12) the o-ring (34, 35) back onto the 

chuck body and tighten head socket screws (11) in chuck body 

(23). Reassemble the switch rings for pressure control and stroke 

control. 

5.2.6 Lubricate the safety valve (10) and the safety valve 

ball in the chuck body (23) slightly with oil and slide in the 

valve into the body. Please observe that the valve must slide 

easily in the ball. Now reinsert o-ring (39) and close plug (9). 

All parts of the SMW-AUTOBLOK self-contained 

frontend power chuck move easily. When reassembling 

the chuck never apply force! 

ATTENTION! 

5.3 Trouble shooting 

5.4 Spare parts 

REASSEMBLING 

Trouble: caused by and action: 

5.3.1 On o.d. or i.d. clamping: 

The chuck is clamping but 

reverses the movement immediately. 

5.3.2 Air leakage inside the 

air distributor ring during 

actuation of the jaws. 

5.3.3 The chuck is loosing 

clamping force. 

5.3.4 Air leakage on the 

chuck after finishing the clamping 

cylce. 

The safety valve does not move 

in the bore. Remove safety 

valve (10), clean and oil slightly. 

Reassemble the safety valve 

and check for easy movement. 

Contamination underneath 

the profile seals (5/8): Remove 

air distributor ring (4), profile 

seals (5/8), check for damage 

and clean and oil slightly. If 

necessary replace! 

Disassemble the chuck completely, 

check all parts for 

damage, clean, replace all orings 

and safety valve. 

O-rings or seals in the safety 

valve damaged or worn out. 

See also point 5.3.3. 

Below drawing shows the most common spare parts for the 

chuck. Please always state chuck type, size and serial number 

when ordering spare parts. Seal kits are available in sets only! 

(Pressure control and 

stroke control are not 

shown) 


General safety instructions 

1.1 Correct use 

SMW-AUTOBLOK control units work safely and 

troublefree if they are used according to their spe- 

WARNING! cification i.e. to actuate and control selfcontained 

air chucks on turning machines. 

Any other use can cause hazards. 

Important: The control units AC-SP/AC-BB do not allow to 

use the safety features pressure control of clamped chuck in 

o.d. clamping and the rapid stroke control. All necessary steps 

to ensure safety must be taken. 

WARNING! 

Description of function AC-SP / AC-BB 

The AC-SP / AC-BB are designed and manufactured to operate 

pneumatic front and chucks of the SMW-AUTOBLOK series 

SP and BIG BORE. 

The main part is a pneumatic block with pressure regula-tion, 

pressure switch, two 3/2 valves with quick exhaust and 2 air 

flow sensors. 

The 2 current monitors and the 2 relays are intended to be 

installed in the machine side control unit. They can be plugged 

on usual 35 mm mounting brackets. 

The control unit has no own operating devices. The pneumatic 

block that contents all pneumatic parts should be mounted 

in a well accessible place at the machine. 

The installation of a manual switch or foot switch or the connection 

for automatic operation (machine control) is required. 


1.2 Personnel 

Control units must be installed, operated and 

maintained only by qualified and regularly trained 

personnel. 

1.3 Protections 

During actuating of the chuck the flow of the air 

to the chuck is monitored via airflow sensors (air 

WARNING! 

flow/pressure). As soon as the actuation cycle of 

the chuck is finished and the air flow stops the pressure in the 

supply lines is switched off. The built-in non-return valve in the 

chuck body closes and traps the air pressure inside of the 

chuck body during the chuck rotates. 

pressure switch 

(optional pressure converter) 

pressure regulation 

with pressure gauge 

for clamping pressure 

3/2 valves 

air flow sensor 

CONTROL UNIT AC-SP / AC-BB 

During machining the power chuck and the clamped 

component must be protected by safety guard. Open 

machine door only when machine spindle is completely 

stopped. Maintenance and actuation of the power chuck 

must only be carried out when machine spindle is stopped. 

1.4 Remaining risks 

The type of components (shape, weight, unbalan- 

WARNING! ce, material etc.) has a big influence on the system 

“machine tool - power chuck - component”. For 

that reason there is always a residual risk. 

These residual risks must be calculated by the user and have to 

be eliminated by suitable actions. 

1.5 Maintenance 

The function of the control unit has to be checked 

once a month due to safety reasons. The level of 

WARNING! 

the oil in the air service unit (optional) has to be 

checked regularly. The function of the air service unit (optional) 

has to be checked regularly. A air service unit to clean and lubricate 

the air is mandatory! 

For any problems or questions please contact SMW- 

AUTOBLOK directly or one of our authorized offices. 

current monitor 

relay 

Function sequence 

Filtered, dehydrated and lubricated air connected at the pressure 

regulation. 

When switching the solenoid valves clamping/unclamping the 

air flow in the corresponding line to the chuck will be released. 

The in-built air flow sensors together with the current monitors 

register the air flow and keep it up (red LED is on). 

(Attention: Impulse must be current for 1 second to make the 

unit come to self-holding through the air flow sensors.) 

After reaching of the clamping position with a pre-adjusted 

pressure the airflow stops. The air flow sensors register this 

and give the sign “release” through the current monitors (red 

LED goes off). The machining process can be started.

The release of the machine spindle (only possible at full 

spindle stop) only happens when conditions A + B are given: 

Condition A 

Air pressure (clamping pressure) in the chuck reaches during 

the filling process (clamping) the pre-adjusted value at the 

pressure switch. 

Optional accessories: 

Foot switch F2 incl. 4 m wire 

Id.-No. 013324 

Standard delivery range: 

like shown without hoses and 

connectors 

Air service unit 

(must be used to clean and 

lubricate the air!) 

chuck connections 

clamping/unclamping 


Condition B 

Clamping process is completed, that means in the line for 

clamping there is no more air flow. 

Attention: At running spindle the operation of the 

chuck is not possible. 

fixing holes 

total depth 110 mm 

connection line 

pressure 

Type I.D. Id.-No. 

AC-SP 24 V 1/4” 192432 

AC-SP 110 V 1/4” 192446 

AC-SP 220 V 1/4” 192447 

AC-BB 24 V 1/2” 192433 

AC-BB 110 V 1/2” 192448 

AC-BB 220 V 1/2” 192449 


Installation 

Fixing the control unit 

The control unit has to be mounted well accessible in a 

dry area, e.g. close to the control panel of the machine 

Electrical connection 

Electric parts (current monitors and relays) are to be 

mounted in the machine side control cabinet or at 

another suitable place. Please consider general regulations 

(see wiring diagram page 6). 

Electric power supply 

The power supply is either 24 VDC, 110 VAC or 230 

VAC, 50/60 Hz. The AC-SP/AC-BB are not equipped 

with a ON/OFF switch and are connected at the control 

cabinet of the machine. 

Pneumatic power supply 

(See pneumatic plan page 6.). The pneumatic line has 

to be connected with the pressure regulating valve. 

Connect control unit and chuck with hoses. Hoses with 

low elasticity, I.D. min. for AC-SP = 8 mm, for AC-BB = 

12 mm, are to be used! 

WARNING! 


The hoses, fittings, aramtures and tubes 

must ot be smaller in ID than 8 mm 

(AC-SP) or12 mm (AC-BB) 

min. operating pressure = 2 bar 

max. operating pressure = 10 bar 

All connections need to be checked for leakage. 

Recommended oil for air lubrication (air maintenance 

unit optional) HLP 32. 

WARNING! 

Air service unit to clean and lubricate the 

air must be installed! Rust or contamination 

can cause damage of seals and thus 

loss of clamping force. 

Putting into operating 

Switch on electric power supply 

Green LED at the current monitors is on and indicates 

ready for operation. 

Adjust pressure regulator to min. pressure 2 bar. 

Switch operating device (foot switch, manual switch 

or M-function). 

During the operation/movement of the chuck, additionally 

the red LED on the corresponding monitor is 

on and by this indicates the air flow. After reaching of 

the end-position the air flow stops and the red LED 

goes off. Repeat this sequence for both operating 

directions (clamping/unclamping) at min. and max. 

operating pressure. 

The sensibility of the air flow sensor is adjusted to a 

standard value from the manufacturer. It can be readjusted 

according to the local conditions at the 

potentiometer “sensibility/Empfindlichkeit”. 

Operating 



Make sure that the adjustment of the air 

flow sensor insures a correct clamping 

force at the chuck. (Check clamping 

WARNING! 

force with a suitable grip force meter, see 

operating manual of the chuck). Unsuitable clamping 

force can cause accidents at the machine. 

Adjust lubricator at the maintenance unit (optional). 

oil amount approx. 1 drop for 2 - 3 clamping cycles. 

Switch on unit together with the machine 

The unit is ready for operation, when the both green 

LED’s on the current monitors are on. 

Adjust required clamping pressure and pressure switch 

accordingly. 

Release clamping/unclamping by connected operating 

device. 

To get the unit in self-holding position by the air flow 

sensors, the impulse must be current by approx. 1 

second. 

Every 3 days Check oil volume (maintenance unit 

optional) 

Refill oil type HLP 32. 

Weekly Check function and adjustment of the 

lubricator (optional) 

Adjustment: one drop per 2 - 3 clamping 

cycles. 

Monthly Check the function of the control unit. 

Monthly Check the clamping force of the chuck 

therefore clamp grip force meter in the 

chuck. The cripping force must not 

decrease by more than 10 % in one hour 

(see operating instructions of the chuck). 

Trouble shooting 

Green LED at the current monitors is not on 

⇒ no electric power supply 

Red LED at the current monitors does not go off 

a) ⇒ air flow still existing because of leaking hoses 

connectors, or chuck 

b) ⇒ sensibility of air flow sensors is adjusted wrongly 

Pneumatic control switches off without movement of 

the chuck 

a) ⇒ pressure too low 

b) ⇒ chuck or safety valve blocked mechanically 

c) ⇒ time of impulse for clamping/unclamping too 

short

PNEUMATIC DIAGRAM AC-SP / AC-BB 

pneumatic power supply 

max. pressure 10 bar 

WIRING DIAGRAM AC-SP / AC-BB 

relais 

pressure reducer 

hoses, fittings, aramtures and 

tubes must not be smaller in 

ID than 

8 mm (AC-SP) or 

12 mm (AC-BB) 

period of impulse for clamping/unclamping 1 s 

air flow 

sensor 

air flow 

sensing 

valve 

Y1 

voltage only at spindle stop 

pressure control 

(option) 

clamping chuck 


air flow 

sensing 

valve 

Y2 

operating voltage ok 

GREEN RED 

air flow current 

sensibility 

pressure converter 

0-10 bar 

air flow 

sensor 

option 


Universal, electronic micro-processor compact control unit 

for Big Bore chucks in 1/2” design type ACU-NT 

All safety systems integrated 

Easy installation - no other devices needed 

Can be connected to all common voltages 

LCD display in English/German 

Quick chuck actuation by 1/2” pneumatic parts 

Line pressure 

LCD display 

English/German 

Key switch to select 

manual operation, 

foot pedal or 

automatic cycle 

Accessories: 

Foot pedal F2 

with 4 m cable 

Id.No. 013324 

Options: 

Line pressure control 192437 

Pressure control for 

chuck o.d. clamping 

Rapid stroke control 

(for BB-N ES only) 


192435 

192436 

Interface 192439 

Lubrication unit 192438 

Second independent ok 

relay 

192440 

CONTROL UNIT ACU-NT 

Push button 

close (B) / open (A) 

Reset Hysteresis for 

pressure switch 

Electric connections 

Proximity switch for pressure 

and rapid stroke control signals 

Id.No. 090636 

Air service unit 1/2” 

Id.No. 192074 

I.d. / o.d. clamping 

Protection cover 

A 

B 

1/2” pressure 

connecting lines 

to the chuck 

clamp/unclamp 

Standard equipment: 

(as shown, without cable, without hoses 

without fittings) 

Pressure is shown in the display, minimum pressure pre-selectable, 

contact for monitoring the pressure. 

Pressure control of the chuck chamber via proximity switch, contact for monitoring, 

self diagnostic of proximity switch (for o.d. clamping only). 

Control of rapid/clamping stroke via proximity switch, contact for monitoring, 

self diagnostic of proximity switch. 

To show data chuck clamped, unclamped, too long clamping cycle, air supply lines 

leaking, i.d./o.d. clamping, pressure control deactivated on the machine display. 

Actuation of an external lubrication unit with intervals, oil reservoir control, 

pressure control. 

Additional relay to double confirm for spindle run.

Pneumatic diagram ACU-NT 

Electric diagram ACU-NT 

CONTROL UNIT ACU-NT 


Electric connection ACU-NT 

For further information please refer to the service manual ACU-NT 


CONTROL UNIT ACU-NT

Service manual BIG BORE - SMW Autoblok

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