SCHUNK ROTA NCO 165, ROTA NCO 200, ROTA NCO 315, ROTA NCO 400, ROTA NCO 500 Operating Manual

Translation of the original operating manual

Power Chuck

ROTA NCO

Operating Manual

Superior Clamping and Gripping

Imprint

2 01.04| ROTA NCO |en

Imprint

Copyright:

This manual remains the copyrighted property of SCHUNK GmbH & Co. KG. It is solely
supplied to our customers and operators of our products and forms part of the product.
This documentation may not be duplicated or made accessible to third parties, in particu­lar competitive companies,
without our prior permission.

Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.

Document number: 0889055

Edition: 01.05 |26/07/2017|en

© SCHUNK GmbH & Co. KG
All rights reserved.

Dear customer,

congratulations on choosing a SCHUNK product. By choosing SCHUNK, you have opted for
the highest precision, top quality and best service.

You are going to increase the process reliability of your production and achieve best
machining results – to the customer's complete satisfaction.

SCHUNK products are inspiring.

Our detailed assembly and operation manual will support you.

Do you have further questions? You may contact us at any time – even after purchase.

Kindest Regards

Your H.-D. SCHUNK GmbH & Co.

Spanntechnik KG

Lothringer Str. 23
D-88512 Mengen

Tel. [phone]
Fax [phone]

[e-mail]
www.schunk.com

Table of contents

01.04| ROTA NCO |en

3

Table of contents

1

General .................................................................................................................... 5

1.1

Warnings ................................................................................................................... 5

1.2

Applicable documents .............................................................................................. 6

2

Basic safety notes ..................................................................................................... 7

2.1

Intended use ............................................................................................................. 7

2.2

Not intended use ...................................................................................................... 7

2.3

Notes on particular risks ........................................................................................... 8

2.4

Notes on safe operation ......................................................................................... 11

2.4.1

Substantial modifications ............................................................................ 14

2.5

Personnel qualification ........................................................................................... 14

2.6

Organizational measures ........................................................................................ 14

2.7

Using personal protective equipment .................................................................... 15

3

Warranty ................................................................................................................. 16

4

Torque per screw .................................................................................................... 17

5

Scope of delivery ..................................................................................................... 17

6

Technical data ......................................................................................................... 18

6.1

Chuck data .............................................................................................................. 18

6.2

Clamping force / speed diagrams ........................................................................... 18

6.3

Calculations for clamping force and speed ............................................................ 22

6.3.1

Calculation of the required clamping force in case of a given rpm ............ 22

6.3.2

Calculation example: Required initial clamping force Fsp0

for a given rpm n ......................................................................................... 24

6.3.3

Calculation example: permissible RPM for a given

effective clamping force .............................................................................. 25

6.4

Grades of Accuracy ................................................................................................. 26

6.5

Permissible imbalance ............................................................................................ 26

7

Mounting ................................................................................................................ 27

7.1

Pre-assembly measures .......................................................................................... 27

7.2

Mounting of the Power Chuck ............................................................................... 27

7.3

Horizontal attachment ........................................................................................... 28

7.4

Vertical attachment ................................................................................................ 28

8

Function .................................................................................................................. 29

8.1

Function and handling ............................................................................................ 29

8.2

Change or supplement of jaws ............................................................................... 29

8.3

Disassembly of chucks for complete cleaning or in case of damage ..................... 29

8.4

Assembly of various energy inserts ........................................................................ 31

Table of contents

4 01.04| ROTA NCO |en

9

Maintenance ........................................................................................................... 34

9.1

Lubrication .............................................................................................................. 34

9.2

Maintenance intervals ............................................................................................ 34

9.3

Central oil lubrication ............................................................................................. 35

9.4

Changing the top jaws ............................................................................................ 35

10

Disposal .................................................................................................................. 35

11

Spare parts .............................................................................................................. 36

12

Assembly drawings .................................................................................................. 38

13

Translation of original EC declaration of incorporation ............................................ 40

General

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5

General

This operating manual is an integral component of the product and
contains important information on safe and proper assembly,
commissioning, operation, care, maintenance and disposal. This
manual must be stored in the immediate vicinity of the product
where it is accessible to all users at all times.

Before using the product, read and comply with this manual,
especially the chapter “Basic safety notes”.( 2, Page 7)

If the product is passed on to a third party, these instructions must
also be passed on.

Illustrations in this manual are provided for basic understanding of
the product and may differ from the actual product design.

We accept no liability for damage resulting from the failure to
observe and comply with this operating manual.

Warnings

To make risks clear, the following signal words and symbols are
used for safety notes.

DANGER

Danger for persons.

Non-compliance will inevitably cause irreversible injury or death.

WARNING

Dangers for persons.

Ignoring a safety note like this can lead to irreversible injury and

even death.

CAUTION

Dangers for persons.

Non-observance can cause minor injuries.

1

1.1

General

6 01.04| ROTA NCO |en

NOTICE

Material damage

Information about avoiding material damage.

WARNING

Warning about hand injuries

WARNING

Warning about hot surfaces

Applicable documents

General terms of business

Catalog data sheet of the purchased product

Calculation of the jaw centrifugal forces
("Technology" chapter in the lathe chuck catalog)

The above mentioned documents can be downloaded at

www.de.schunk.com.

1.2

Basic safety notes

01.04| ROTA NCO |en

7

Basic safety notes

Improper handling, assembly and maintenance of this product may
result in risk to persons and equipment if this operating manual is
not observed.

Report any failures and damage immediately and repair without
delay to keep the extent of the damage to a minimum and prevent
compromising the safety of the product.

Only use original SCHUNK spare parts.

Intended use

The chuck is used to clamp workpieces on machine tools and
other suitable technical facilities, paying particular attention to
the technical data specified by the manufacturer. The technical
data specified by the manufacturer must never be exceeded.

The product is intended for industrial use.

Intended use also means that the user has read and understood
this operating manual in its entirety, especially the chapter “Basic
safety notes”.

The maximum RPM of the chuck and the required clamping force
must be determined by the user for the respective clamping task
based on the applicable standards and technical specifications of
the manufacturer.
(See also “Calculations for clamping force and RPM” in the chapter
“Technical data”). ( 6, Page 18)

Not intended use

The product is not being used as intended if, for example,

• It is used as a press, a punch, a chuck, a load-handling device or
as lifting equipment.

• It is used in working environments that are not permissible.

• Workpieces are not clamped properly, paying particular
attention to the clamping forces specified by the manufacturer.

• People work on machines or technical equipment that do
not comply with the EC Machinery Directive 2006/42/EC,
in violation of the applicable safety regulations.

2

2.1

2.2

Basic safety notes

8 01.04| ROTA NCO |en

• The technical data for use of the product specified by the man­ufacturer are exceeded.

Notes on particular risks

This product may pose a danger to persons and property if, for
example:

• It is not used as intended;

• It is not installed or maintained properly;

• The safety and installation instructions, local applicable safety
and accident prevention regulations or the EC Machinery
Directive are not observed.

DANGER

Possible risk of fatal injury to operating personnel due to the

workpiece falling down or being flung out in the event of a
power failure!

In the event of a power failure, the chuck's clamping force may
fail immediately and the workpiece may be released in an
uncontrolled manner. This poses a risk of death or injury to
the operating personnel and can result in serious damage to
the system.

• Due to the carried out and documented danger assessment
and risk evaluation, the machine manufacturer and its
operator have to ensure that appropriate measures have
been taken in order to maintain the clamping force of the
chuck until the machine's standstill, and to secure the
workpiece correspondingly (e.g. via a crane or a suitable
hoist).

• The machines and facilities must fulfill the minimum
requirements of the EC Machinery Directive 2006/42/EC;
specifically, they must have effective technical measures to

protect against possible mechanical hazards.

2.3

Basic safety notes

01.04| ROTA NCO |en

9

DANGER

Possible risk of fatal injury to operating personnel if a jaw

breaks or if the chuck fails because the technical data have been
exceeded and a workpiece is released or parts fly off!

• The technical data specified by the manufacturer for using the
chuck must never be exceeded.

• The chuck may only be used on machines and facilities
that fulfill the minimum requirements of the EC Machinery
Directive 2006/42/EC; specifically, they must have effective
technical measures to protect against possible mechanical

hazards.

DANGER

Possible risk of fatal injury to operating personnel from clothing

or hair being caught on the chuck and being dragged into the
machine

Loose clothing or long hair may become caught on projecting
parts of the chuck and be drawn into the machine.

• The machines and facilities must fulfill the minimum require­ments of the EC Machinery Directive 2006/42/EC; specifically,
they must have effective technical measures to protect
against possible mechanical hazards.

• Always wear tight-fitting clothing and a hairnet when working

on the machine and the chuck.

WARNING

Risk of injury due to dropping the chuck during transport,

installation or removal.

• Take special care in the danger zone when transporting,
installing or removing the chuck.

• Note the relevant load securing regulations for working safely
with cranes, ground conveyors, lifting gear and load-handling

equipment.

Basic safety notes

10 01.04| ROTA NCO |en

CAUTION

Danger of slipping and falling in case of dirty environment

where the chuck is used (e.g. by cooling lubricants or oil).

• Make sure the work environment is clean before beginning
assembly and installation tasks.

• Wear suitable safety shoes.

• Observe the safety and accident prevention regulations during
operation of the chuck, especially in connection with machin-

ing centers and other technical equipment.

CAUTION

Danger of limbs being crushed by opening and closing of the

chuck jaws during manual loading and unloading or when
replacing moving parts.

• Do not reach between the jaws.

• Wear safety gloves.

• Observe the safety and accident prevention regulations
during operation of the chuck, especially in connection with

machining centers and other technical equipment.

CAUTION

Risk of burns due to workpieces with high temperatures.

• Wear protective gloves when removing the workpieces.

• Automatic loading is preferred.

CAUTION

Risk of damages due to incorrect choice of clamping position for

chuck jaws on workpiece.

If an incorrect clamping position is chosen for the chuck jaws on
workpiece, the base and the top jaws may be damaged.

• The T-nuts combine the top jaws with the base jaws and they
should never protude over the base jaws in radial direction.

• The outer diameter of the screwed top jaws must not exceed

the outer diameter of the chuck by more than 10%.

Basic safety notes

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11

CAUTION

Hazard from vibration due to imbalanced rotating parts and

noise generation.

Physical and mental strains due to imbalanced workpieces and
noise during the machining process on the clamped and rotating
workpiece.

• Ensure the chuck's axial and concentric runout.

• Check options for remedying imbalances on special top jaws
and workpieces.

• Reduce the speed.

• Wear hearing protection.

Notes on safe operation

• The machine spindle may only be started up when clamping
pressure has built up in the cylinder and clamping has followed
in the permitted work area.

• Unclamping may only be possible when the machine spindle
has come to a standstill.

• If the clamping energy fails, the workpiece must remain firmly
clamped until the spindle is shut down and the workpiece is
secured.

• The technical safety requirements in the respective operating
instructions must be observed exactly.

Functional test
After installation of the chuck, its function must be checked prior
to start-up.

Two important points are:

• Clamping Force! The clamping force of the chuck must be
achieved at max. operating force/pressure.

• Stroke control! The stroke of the clamping piston must allow
a safety zone at the front and rear end position. The machine
spindle may only be started when the clamping piston has
passed through the safety zone. Only limit switches that meet
the requirements for safety limit switches specified in DIN EN
60204-1 may be used.

When determining the necessary clamping force to machine a
workpiece, take the centrifugal force acting on the chuck jaws into
account (according to VDI 3106).

2.4

Basic safety notes

12 01.04| ROTA NCO |en

If the chuck jaws are changed, adjust the stroke control to the new
situation.

Speed

DANGER

Possible risk of fatal injury to operating personnel if the chuck's

top speed is exceeded and a workpiece is released or parts fly
off.

If the machine tool or technical equipment can reach a higher
speed than the chuck's top speed, a reliable speed limiter must
be installed and proof must be provided that the speed limiter is

effective.

Maintenance instructions
The chuck's reliability and safety can only be guaranteed if the
operator complies with the manufacturer's maintenance
instructions.

• For lubrication, we recommend our tried and tested special
grease, LINO MAX. Unsuitable lubricants can have a negative
impact on the functioning of the chuck (clamping force,
coefficient of friction, wear characteristics).
(For product information about LINO MAX, see the
"Accessories" chapter of the SCHUNK lathe chuck catalog
or contact SCHUNK).

• Use a suitable high-pressure grease gun to ensure that you
reach all the greasing areas.

• To ensure correct distribution of the grease, move the clamping
piston to its end positions several times, lubricate again, and
then check the clamping force.

• We recommend checking the clamping force using a clamping
force tester before starting a new production run and between
maintenance intervals. "Only regular checks can guarantee
optimal safety."

• The clamping force should always be measured in the state of
the chuck as used for the current clamping situation. If top jaws
with clamping steps are used, measuring must be performed in
the same step as for the respective clamping task. In the event
of high operating speeds, clamping force losses must be
accounted for due to the centrifugal force acting on the
chuck jaws.

Basic safety notes

01.04| ROTA NCO |en

13

The operating clamping force must in this case be
determined by means of dynamic measurement.

• Move the clamping piston through to its end position several
times after 500 clamping strokes, at the latest. (This moves the
lubricant back to the surfaces of the force transmission. This
means that the clamping force is retained for longer).

Safety notes for servicing

Follow all the applicable legal norms for health and safety during
servicing. Use suitable personal protective equipment, especially
protective gloves, goggles and safety boots, paying particular
attention to the operating system and hazard assessment.

DANGER

Possible risk of fatal injury to operating personnel due to chuck

failure if the servicing instructions for the chuck are disregard­ed!

The servicing instructions specified by the manufacturer must be
complied with to ensure safe operation of the chuck.
Work must be carried out by qualified specialist personnel with

the relevant safety training.

Use of special chuck jaws
When using special chuck jaws, please observe the following rules:

• The chuck jaws should be designed to be as light and as low
as possible. The clamping point must be as close as possible
to the chuck face (clamping points at a greater distance lead
to greater surface pressure in the jaw guidance and can
significantly reduce the clamping force).

• Do not use welded jaws.

• If for constructional reasons the chuck jaws in special design
are heavier than the top jaws assigned to the clamping device,
greater centrifugal forces must be accounted for when defining
the required clamping force and the recommended speed.

• Screw the jaw mounting screws into the bore holes furthest
apart.

Basic safety notes

14 01.04| ROTA NCO |en

• The maximum recommended speed may only be operated in
conjunction with maximum actuating force and only with the
chuck in optimal, fully functioning condition.

• If the chuck is involved in a collision, it must be subjected to a
crack test before using it again. Replace damaged parts with
original SCHUNK spare parts.

• Replace the chuck jaw mounting screws if there are signs of
wear or damage. Only use screws with a quality of 12.9.

Substantial modifications

No substantial modifications may be made to the chuck.

If the operator carries out a substantial modification to the
chuck, the product shall no longer conform to the EC Machinery
Directive 2006/42/EC.

Personnel qualification

Assembly and disassembly, commissioning, operation and repair of
the chuck may be performed only by qualified specialists who have
been instructed with respect to safety.

All persons who are assigned to operate, maintain and repair our
chuck must have access to the operating manual, especially the
chapter “Fundamental safety instructions”. We recommend that
the operator create in-house safety operating instructions.

Persons in training may be assigned to machines and technical
equipment in which a chuck is mounted only if they are under the
constant guidance and supervision of qualified specialists.

Organizational measures

Obeying the rules

Via suitable organizational measures and instructions, the
operator must ensure that the relevant safety rules are obeyed
by the persons asked to operate, maintain and repair the chuck.

Checking the behavior of personnel
The operator must at least occasionally check that the personnel
are behaving in a safety conscious manner and are aware of the
potential hazards.

2.4.1

2.5

2.6

Basic safety notes

01.04| ROTA NCO |en

15

Danger signs
The operator must ensure that the signs concerning safety and
hazards mounted on the machine where the chuck is mounted
are clearly legible and are observed.

Faults
If a fault occurs on the chuck and this fault endangers safety or if
a problem is suspected due to production characteristics, the
machine tool where the chuck is mounted must be immediately
stopped and remain shut down until the fault has been located
and remedied. Only allow specialists to remedy faults.

Spare parts
Only ever use original SCHUNK spare parts.

Environmental regulations
Comply with the applicable legal norms when disposing of waste.

Using personal protective equipment

When using this product, you must comply with the relevant
health and safety at work rules and you must use the required
personal safety equipment (minimum: category 2).

2.7

Warranty

16 01.04| ROTA NCO |en

Warranty

If the product is used as intended, the warranty is valid for
24 months from the date of delivery from the production facility
under the following conditions:

• Observe the applicable documents( 1.2, Page 6)

• Observe the environmental and operating conditions.

• Observation of the maximum clamping cycles( 6, Page 18)

• Observe the mandatory maintenance and lubrication inter­vals.( 9, Page 34)

Parts touching the work piece and wearing parts are not part
of the warranty.

3

Torque per screw / Scope of delivery

01.04| ROTA NCO |en

17

Torque per screw

Tightening torques for mounting screws for clamping the chuck

(screw quality 10.9)

Screw size

M6

M8

M10

M12

M14

M16

M18

M20

M22

M24

M27

M30

Admissible torque
MA (Nm)

13

28

50

88

120

160

200

290

400

500

1050

1500

Tightening torques to mount top jaws onto the chuck
(screw quality 12.9)

Screw size

M6

M8

M10

M12

M14

M16

M20

M24

Torque MA (Nm)

16

30

50

70

130

150

220

450

Tightening torques to mount the protection sleeve
(screw quality 8.8)

Screw size

M5

M6

Admissible torque MA (Nm)

5.5

9

Scope of delivery

1

Power Chuck incl. fastening screws

base jaws with fine serration incl. T-nuts with screws

base jaws with tenon and slot incl. jaw fixing screws

1

Eye bolt (DIN 580) from size 260 and up

4

5

Technical data

18 01.04| ROTA NCO |en

Technical data

Chuck data

ROTA NCR

165

200

250

315

400

500

630

Max. actuating force [kN]

30

42

62

90

120

140

140

Max. clamping force [kN]

72

95

150

190

270

330

330

Max. rotation speed [min-1]

6000

5000

4500

3600

2500

2000

1600

Stroke per jaw [mm]

6.4

9.0

10.0

13.0

15.0

15.0

15.0

Piston stroke [mm]

24

27

30

40

45

45

45

Centrifugal torque of base jaw

fine serration

M

cGB

[kgm]

0.025

0.043

0.099

0.161

0.431

0.674

1.085

Centrifugal torque of base jaw

Tongue and groove

M

cGB

[kgm]

0.030

0.056

0.137

0.241

0.571

— — Max. jaw eccentricity of center of

gravity in axial direction a

max

[mm]

30

30

40

32

40

40

40

The recommended max. r.p.m. is only valid for max. operating
force and the use of the suitable hard standard stepped jaws
Type SHB.

When using unhardened top jaws or jaws in special design, make
sure that their weight is as low as possible.
For soft top jaws or jaws in special design the permissible speed
of the respective cutting task has to be calculated in accordance
to VDI 3106, whereby the maximum standard value may not be
exceeded. The calculated values have to be examined with a
dynamic measurement. Control of function (piston movement and
actuation pressure) has to be accomplished in accordance with the
guidelines of the professional association.

Clamping force / speed diagrams

The diagrams refer to 3-jaw-chuck.

Clamping force/RPM curves have been calculated using hard jaws.
The chucks were operated with the max. permissable force and
the jaws were located exactly on line with the chuck O.D.

6

6.1

6.2

Technical data

01.04| ROTA NCO |en

19

The chuck is in perfect condition and lubricated with SCHUNK LINO
MAX special grease.

Should one or several of the above mentioned parameters be
changed the diagrams are no longer valid.

Chuck set-up for clamping force / speed diagram

F/3

Clamping force per jaw

S

Center of gravity

rs

Center of gravity radius

a

max

Max. jaw eccentricity of

center of gravity in axial

direction

F

max

Max. actuating force [kN]

Clamping force / speed diagram ROTA NCO 165

Technical data

20 01.04| ROTA NCO |en

Clamping force / speed diagram ROTA NCO 210

Clamping force / speed diagram ROTA NCO 260

Clamping force / speed diagram ROTA NCO 315

Technical data

01.04| ROTA NCO |en

21

Clamping force / speed diagram ROTA NCO 400

Clamping force / speed diagram ROTA NCO 500

Clamping force / speed diagrams ROTA NCO 630

Technical data

22 01.04| ROTA NCO |en

Calculations for clamping force and speed

Missing information or specifications can be requested from the
manufacturer!

Legend

Fc

Total centrifugal force [N]

M

cAB

Centrifugal torque of top jaws [Kgm]

Fsp

Effective clamping force [N]

M

cGB

Centrifugal torque of base jaws [Kgm]

F

spmin

Minimum required clamping force [N]

n

Speed [rpm]

F

sp0

Initial clamping force [N]

rs

Center of gravity radius [m]

F

spz

Cutting force [N]

r

sAB

Center of gravity radius of top jaw [m]

mAB

Mass of one top jaw [kg]

ssp

Safety factor for clamping force

mB

Mass of chuck jaw set [kg]

sz

Safety factor for machining

Mc

Centrifugal force torque [Kgm]

Σs

Max. clamping force of chuck [N]

Calculation of the required clamping force in case of a given rpm

The initial clamping force F

sp0

is the total force impacting radially
on the workpiece via the jaws due to actuation of the lathe chuck
during shutdown. Under the influence of rpm, the jaw mass gen­erates an additional centrifugal force. The centrifugal force reduc­es or increases the initial clamping force depending on whether
gripping is from the outside inwards or from the inside outwards.
The sum of the initial clamping force F

sp0

and the total centrifugal

force F

c

is the effective clamping force Fsp.

(–) for gripping from the outside in
(+) for gripping from the inside out

DANGER

Risk to life and limb of the operating personnel and significant

property damage when the RPM limit is exceeded!
With gripping from the outside inwards, and with increasing
RPM, the effective clamping force is reduced by the magnitude
of the increasing centrifugal force (the forces are opposed).
When the RPM limit is exceeded, the clamping force drops
below the required minimum clamping force F

spmin

. Conse-

quently, the workpiece is released spontaneously.

• Do not exceed the calculated RPM.

• Do not fall below the necessary minimum clamping force.

6.3

6.3.1

Technical data

01.04| ROTA NCO |en

23

Reduction in effective clamping force by the magnitude of the total centrifugal force, for gripping from the outside inwards.

The required effective clamping force for machining Fsp is calculat­ed from the product of the machining force F

spZ

with the safety

factor S

z

. This factor takes into account uncertainties in the calcu-

lation of the clamping force. According to VDI 3106, the following
is valid: S

z

≥ 1.5.

From this we can derive the calculation of the initial clamping
force during shutdown:

(–) for gripping from the outside in
(+) for gripping from the inside out

NOTICE

This calculated force must not be larger than the maximum

clamping force ΣS engraved on the chuck.

See also the table “Chuck data”( 6.1, Page 18)

From the above formula it is evident that the sum of the effective
clamping force F

sp

and the total centrifugal force Fc is multiplied by

thesafety factor for the clamping force S

sp

. According to VDI 3106,

the following also applies here: S

sp

≥ 1.5.The total centrifugal force

F

c

is dependent both on the sum of the masses of all jaws and on

the center of gravity radius and the RPM.

Technical data

24 01.04| ROTA NCO |en

NOTICE

For safety reasons, in accordance with DIN EN 1550, the centrif-

ugal force may be a maximum of 67% of the initial clamping

force.

The formula for the calculation of the total centrifugal force Fc is:

n is the given speed in r.p.m. The product m

B

∙ rsis described as the

centrifugal force torque M

c

.

In case of chucks with split chuck jaws, i.e. with base jaws and top
jaws, for which the base jaws change their radial position only by
the stroke amount, the centrifugal torque of base jaws M

cGB

and

the centrifugal torque of top jaws M

cAB

need to be added:

The centrifugal torque of the base jaws M

cGB

is taken from the ta-

ble “Chuck data”( 6.1, Page 18)

; the centrifugal torque of the

top jaws M

cAB

is calculated as follows:

Calculation example: Required initial clamping force Fsp0 for a
given rpm n

The following data is known for the machining job:

• gripping from the outside in (application-specific)

• machining force F

spz

= 3000 N (application-specific)

• max. speed n

max

= 3200 min-1 (“Chuck data” table )

• rpm n = 1200 min

-1

(application specific)

• Mass of one (!) top jaw m

AB

= 5.33 kg (application

specific)

• Center of gravity radius of the top jaw r

sAB

= 0.107 m

(application-specific)

• Safety factor S

z

= 1.5 (as per VDI 3106)

• Safety factor S

sp

= 1.5 (as per VDI 3106)

Note: Masses of the jaw mounting screws and T-nuts are not taken
into account.

6.3.2

Technical data

01.04| ROTA NCO |en

25

First the required effective clamping force Fsp is determined using
the specific machining force:

Initial clamping force during shutdown:

Calculation of total centrifugal force:

For two-part chuck jaws, the following is valid:

The centrifugal torques of the base jaw and the top jaw are taken
from the table “Chuck data”:

For centrifugal torque of the top jaw, the following is valid:

Centrifugal torque for one jaw:

The chuck has 3 jaws, the total centrifugal torque is:

The total centrifugal force can now be calculated:

Initial clamping force during shutdown that was sought was:

Calculation example: permissible RPM for a given effective
clamping force

The following formula can be used to calculate the permissible
RPM for a given initial clamping force during shutdown:

NOTICE

The calculated permissible RPM may not exceed the maximum

RPM inscribed on the chuck for safety reasons!

6.3.3

Technical data

26 01.04| ROTA NCO |en

Calculation example: permissible RPM for a given effective
clamping force

The following data is known from previous calculations:

• Initial clamping force when not rotating F

sp0

= 17723 N

• Machining force for machining job F

spz

3000 N (application-

specific)

• Total centrifugal force of all jaws ∑M

c

= 2.668 kgm

• Safety factor S

z

=1.5 (as per VDI 3106)

• Safety factor S

sp

= 1.5 (as per VDI 3106)

NOTE:
Masses of the jaw mounting screws and T-nuts are not taken into
account.

Identifying the permissible RPM:

The calculated RPM n

zul

= 1495 min-1, is smaller than the maximum

permissible RPM of the chuck n

max

= 3200 min-1, (see table “Chuck

data”( 6.1, Page 18)

).

This calculated RPM may be used.

Grades of Accuracy

Tolerances for run-out accuracy and axial run-out accuracy
correspond to the Technical Supply Terms for lathe chucks as
per DIN ISO 3442-3.

Permissible imbalance

The permissible imbalance for lathe chucks is quality class
G 6.3 as per DIN ISO 1940-1.

6.4

6.5

Mounting

01.04| ROTA NCO |en

27

Mounting

Pre-assembly measures

Carefully lift the product (e.g. using suitable lifting gear) from the
packaging.

CAUTION

Danger of injury due to sharp edges and rough or slippery

surfaces

Use personal protective gear, especially safety gloves.

Check the delivery for completeness and for transport damage.

Mounting of the Power Chuck

• Remove top jaws with fasten screws as well as T-nuts

(if available).

• For actuation of the clamping cylinder, please remove the

drawbar to its front position.

• Disassemble the central feeding insert.

• Move the chuck piston into the front position.

• Basically the chuck can be attached in two positions

(horizontally or vertically), depending on the position of the
machine spindle.

7

7.1

7.2

Mounting

28 01.04| ROTA NCO |en

Horizontal attachment

Lift the chuck by means of an assembly belt or with a ring bolt
aligned to the spindle centre in front of the spindle nose.

• ROTA NCO 165:

Screw the chuck on to the spindle by turning it on its axis until
it stops. Turn the chuck back towards the left until the through
bolts are in alignment with the threads or the driving hole is in
alignment with the driving keys in the spindle for the first time.

• ROTA NCO 210 - 630:

Screw the central fastening screw with a hexagon wrench into
the draw bar or into the drawing tube adapter, until it contacts
the stop.

Vertical attachment

• ROTA NCO 165:

Screw the chuck on to the spindle by turning it on its axis until
it stops. Turn the chuck back towards the left until the through
bolts are in alignment with the threads or the driving hole is in
alignment with the driving keys in the spindle for the first time.

• ROTA NCO 210 - 630:

Put the chuck upside-down onto the assembly device.
Turn the spindel with the assembly device onto the spindle.
Afterwards turn the chuck back until the fastening bores and
the threads of the spindle flang are aligned.
Screw in the central fastening screw with a hexagon wrench
into the draw bar or into the drawing tube adapter.

• Assemble the central feeding insert.

• Secure the chuck fixing screws crosswise.

• Check the concentricity and face runout at the control rim.

• Check the function and the size of the operating force.

• Check that the base jaws run smoothly and that the jaw stroke

is correct.

• Mount the top jaws firmly on the base jaws with the T-nuts and

screws according to the markings 1, 2 and 3.

Dismounting of the spindle is carried out in reverse order.

7.3

7.4

Function

01.04| ROTA NCO |en

29

Function

The item numbers specified for the corresponding individual
components relate to chapter drawings.( 12, Page 38)

Function and handling

Wedge hook chuck are actuated by rotating cylinders with or
without through holes. The axial draw- or pressure forces are
deviated into a radial jaw clamping force via the helical angle of
traction between the piston and the base jaws.

The clamp and unclamping stroke of the jaws is determined by
the cylinder. Moving or changing the base jaws with top jaws bolt­ed to them must be carried out in unclamped position. For safety
reasons the base jaws are still interlocked when the chuck piston is
in this position. The base jaws are unlocked mechanically.

Change or supplement of jaws

Jaws for highest repeatability must be bored and ground in the
chuck under clamping pressure.

• When boring and grinding it is important that the boring ring or

the boring bolts are clamped by the top jaws – and not by the
base jaws. Keep base and top jaws screwed together for later
tasks.

• Keep the base jaws and top jaws screwed in place for recurring

work. Tighten the jaw mounting screws to the specified torque
Link Anzugsmoment für Schrauben.

Tighten the jaw mounting screws with a torque wrench. On no
account tighten the screws with an extension pipe or with ham­mer blows.

Disassembly of chucks for complete cleaning or in case of
damage

The item numbers specified for the corresponding individual
components relate to chapter drawings.( 12, Page 38)

Please cinsider the tightening torques of all screws at every
assembly and disassembly work! (see chapter 4)!

For disassembly, please remove the chuck from the machine and
then disassemble it. Otherwise it can’t be disassembled.

8

8.1

8.2

8.3

Function

30 01.04| ROTA NCO |en

• Remove the top jaws (if existing), T-nuts and fastening screws

from the base jaws.

• Screw screws (item 73) out of the chuck and take out media

insert (item 24). Set screw (item 28) can be taken out (insert
without media lead-through only). O-rings (items 86 and 88)
can be removed from the insert.

• Turn chuck on its back. Remove screws (item 78) and take out

mounting (item 7). O-ring (item 68) can be taken out.

• For chucks with central oil lubrication, remove gauge cartridges

from the chuck.

• Loosen and remove all screws item 75 in the chuck. Carefully

turn chuck on its face side.

• NCO 165 – 400:

The lid (item 2) can now be taken out of the chuck. The wiper
ledges and the flange head screws (items 66 and 67) can be
removed from the chuck lid.

• NCO 500 – 630:

The ledges of the jaw guiding (items 69 and 70) can be taken
out of the chuck. The wiper ledges and the flange head screws
(items 66 and 67) can be removed from the ledges.

• Individually remove base jaws (item 3) from the remaining

chucks. Remove piston (item 4) from the chuck. Loosen set
screw (item 89) and remove nut (item 9). Remove screw
(item 8) and pressure pieces (item 56) from the remaining
pistons. The O-rings (items 87 and 72) can be removed from
the components.

WARNING! In case of base jaw breakage, the bolts and set screws
(item 19) must be exchanged.

The jaw guidings on the chuck body are numbered from 1 – 3.
When mounting the base jaws, it must be ensured that the num­ber of groovings on the base jaws is identical with the numbering
of the jaw guidings and that the base jaws are remounted in the
same position they were in before their removal.
When mounting the piston, it must be ensured that wedge hook
1 is assigned to jaw guiding 1.

Function

01.04| ROTA NCO |en

31

• Remove set screws (items 47, 48 and 59) and lubricating

nipples (item 55) from the chuck body (item 1) and remove
lid (item 2).

• NCO 210 – 400:

Remove cylindrical pins (item 19) from the chuck body.

• NCO 500 – 630:

Remove set screws (item 19) from the base jaw (item 3).

Degrease and clean all parts and check them for damage or wear.
Before installation, lubricate parts well with LINO MAX special
grease.

Only use original SCHUNK spare parts when exchanging damaged
parts.

The chuck is assembled in the same way but in the reverse order.

DANGER

Danger to life and limb of the user by tearing of the chuck of the

spindle when using chuck mounting screws quality 8.8.

If chuck mounting screws of the quality 8.8 get used it can lead to
danger for life and limb of the user and to vastly damage of the
unit.

• Only use screws of the quality 10.9 even if they are flat

headed screws.

Chuck mounting screws of the quality 10.9 can be ordered as spare
parts from SCHUNK.

Assembly of various energy inserts

(Accessories - have to be ordered separately)

Our standard chucks are equipped with a central energy insert
(no energy feed through!).
The chuck can be modified with various energy feed throughsat
a later date.

Please consider the detailed list of necessary components.

(see spare parts list in chapter 11).

8.4

Function

32 01.04| ROTA NCO |en

Modification – Central lubrication

Modification – Air control

Function

01.04| ROTA NCO |en

33

Modification – Coolant

Maintenance

34 01.04| ROTA NCO |en

Maintenance

Lubrication

To maintain the safe function and high quality of the power
chuck it is important to lubricate it regularly at the greese nipples
(Item 55).

In order to assure a constant distribution of grease, the base jaws
have to be moved into the open position for outside clamping.
The power chuck can be greased then and afterwards the base
jaws may be moved into the closed position again. Repeat this
procedure once again.
The next step will be to move the piston several times into its end
position.

Operating Conditions
Depending on operating conditions, check the function and the
clamping force after a certain number of operating circles

( 9.2, Page 34)

. The clamping force can be measured by using a

Grip Force Tester (SCHUNK SGT 270).

All 3 jaws should be greased / lubrified evenly in order to avoid
untrue-running.

Technical condition:The base jaws must move evenly at the

smallest possible actuating pressure (clamping cylinder). This
method is only to some extend expressive and cannot replace
clamping force measurement.

If the clamping force has dropped down too low, or if the base
jaws and piston cannot be freely moved any more, the chuck has
to be disassembled, cleaned and lubricate again.

Only use SCHUNK original spares when replacing damaged parts.

Maintenance intervals

Lubrication of the grease areas:

Lubrication interval

Strain

every 25 hours

normal / coolant utilization

every 8 hours

high / coolant utilization

after 1200 hours or

as needed

Total cleaning with disassembly of the

chuck, depending on type and degree of

contamination

9

9.1

9.2

Maintenance / Disposal

01.04| ROTA NCO |en

35

Central oil lubrication

This chapter applies for chuck type ROTA NCO with modification
"Central oil lubrication" only.

According to the case of application, the chuck has to be lubrified
regularly. The lubrication oil VG220 DIN 51519 is filled into one
bore of the chuck center. (see chapter "Period of maintenance"

( 9.2, Page 34)

). Generally 3-6 impulses (3 sec.) per hour with a
pressure of 10 to 30 bar are released from the pump to the chuck.
The 3 gauge cartridges assure an even distribution of the oil inside
the chuck.

Oil volume of the gauge cartridge:

ROTA NCO
165

ROTA NCO
210

ROTA NCO
260

ROTA NCO
315

ROTA NCO
400

ROTA NCO
500

ROTA NCO
630

0.3 ccm

0.3 ccm

0.3 ccm

0.6 ccm

0.6 ccm

0.6 ccm

0.6 ccm

Changing the top jaws

When changing the top jaws the serration must be cleaned and
greased with SCHUNK special grease LINO MAX.

Disposal

After decommissioning, place the chuck in a position that enables
any liquids in the chuck to drain out.

• Collect the escaping liquids and dispose of them properly in line

with the statutory provisions.

• Remove any identifiable plastic or aluminum parts installed in

or on the chuck and dispose of them properly in line with the
statutory provisions.

• Dispose of the chuck's metal parts as scrap metal.

Alternatively, you can return the chuck to SCHUNK for proper
disposal.

9.3

9.4

10

Spare parts

36 01.04| ROTA NCO |en

Spare parts

When ordering spare parts, it is imperative to specify the type,
size and above all the manufacturing no of the chuck.

Seals, sealing elements, screw connections, springs, bearings,
screws and wiper bars plus parts coming into contact with the
workpiece are not covered by the warranty.

Item

NCO 165 – 400

Item

NCO 500 – 630

1

Chuck body

1 Chuck body

2

Cover

2 Cover

3

Base jaws

3 Base jaws

4

Piston

4 Piston

7

Mount

7 Mount

8

Screw

8 Screw

9*

Nut

9 Nut

16

T-nut

16

T-nut

18

Pin 18

Pin

19*

Set screw/Bolt

19

Set screw/Bolt

24

Insert 01

37

Insert 01

28

Set screw DIN EN ISO 4026

47

set screw DIN EN ISO 4026 (Poly­amide coated)

47

Set screw DIN EN ISO 4026 (Poly­amide coated)

48

O-ring

48

Set screw DIN EN ISO 4026 (Poly­amide coated)

51

Screw DIN 7984 - 10.9 (pitch
circle)

51

screw DIN 7984 - 10.9 (pitch
circle)

55

Tapered lubricating nipple

52

Screw DIN 7984 - 10.9 (pitch
circle)

57

Expander
55

Tapered lubricating nipple

58

Expander

56*

Pressure piece

60

Pressure spring

59

Set screw DIN EN ISO 4026 (Poly­amide coated)

61

Ball
66

Oval-head screw

66

Oval-head screw

67

Wiper

67

Wiper

68

O-ring DIN 3771

68

O-ring / O-ring DIN 3771

69

Gasket, right side (NCO 500)

69

Gasket, right side (NCO 500)

11

Spare parts

01.04| ROTA NCO |en

37

Item

NCO 165 – 400

Item

NCO 500 – 630

70

Gasket, left side (NCO 500)

70

Gasket, left side (NCO 500)

72*

O-ring DIN 3771

72

O-ring DIN 3771

73

Countersunk screw DIN 7991 –

10.9

74

Screw
75

Screw DIN EN ISO 4762 - 10.9

75

Screw DIN EN ISO 4762 - 10.9

78

Screw

78

Screw

85

O-ring DIN 3771

85

O-ring DIN 3771

86

O-ring DIN 3771

86

O-ring DIN 3771

87

O-ring DIN 3771

87

O-ring DIN 3771

88

O-ring DIN 3771

88

O-ring DIN 3771

89

Set screw DIN EN ISO 4027

89

Set screw DIN EN ISO 4027

Modifications(chapter 8.4)

** Not use for ROTA NCO 165

29

Plug

41

O-ring DIN 3771

42

Internal valve components

43

Scuring ring DIN 472

54

Gauge cartridge

Assembly drawings

38 01.04| ROTA NCO |en

Assembly drawings

ROTA NCO 165 – 400

*

At modification oil central lubrication

**

Not use for NCO 165, Item 8 is screwed with Item 4

***

2 x for NCO 165

12

Assembly drawings

01.04| ROTA NCO |en

39

ROTA NCO 500 – 630

Translation of original EC declaration of incorporation

40 01.04| ROTA NCO |en

Translation of original EC declaration of incorporation

in terms of the Directive 2006/42/EG, Annex II, Part 1.B of the European Parliament and of
the Council on machinery.

Manufacturer/

Distributor

H.-D. SCHUNK GmbH & Co.Spanntechnik KG

Lothringer Str. 23

D-88512Mengen

We hereby declare that on the date of the declaration the following incomplete machine

complied with all basic safety and health regulations found in the directive 2006/42/EC of
the European Parliament and of the Council on machinery. The declaration is rendered

invalid if modifications are made to the product.

Product
designation:

Power Chucks without through hole
ROTA NCO 165; 210; 260; 315; 400; 500; 630; 800; 1000

ID number

0856000; 0856001; 0856002; 0856003; 0856010; 0856011; 0856012; 0856013;

0856014; 0856015; 0856020; 0856021; 0856022; 0856023; 0856024; 0856025;
0856030; 0856032; 0856033; 0856034; 0856036; 0856037; 0856040; 0856041;
0856042; 0856043; 0856050; 0856051; 0856060; 0856070; 0856080; 0856081;

0856016; 0856017; 0856018; 0856026; 0856027; 0856028; 0856038

The incomplete machine may not be put into operation until conformity of the machine

into which the incomplete machine is to be installed with the provisions of the Machinery

Directive (2006/42/EC) is confirmed.

Applied harmonized standards, especially:

DIN EN ISO
12100:2010

Safety of machinery - General principles for design - Risk assessment
and risk reduction

DIN EN ISO 1550:
1997+A1:2008

Machine-tools safety – Safety requirements fort the design and con­structions of work holding chucks

Other related technical standards and specifications:

DIN ISO 702-1:2009

Machine tools - Connecting dimensions of spindle noses and work
holding chucks - Part 1: front short-taper mount with screws

DIN ISO 702-4:2004

Machine tools - Connecting dimensions of spindle noses and work
holding chucks - Part 2: cylindrical assembly

VDI 3106:2004-04

Determination of permissible speed (rpm) of lathe chucks (jaw chucks

The manufacturer agrees to forward on demand the special technical documents for the

incomplete machine to state offices.

The special technical documents according to Annex VII, Part B, belonging to the incom­plete machine have been created.

Person authorized to compile the technical documentation:

Philipp Schräder, Address: see manufacturer's address

Mengen,January2015

p.p. Alexander Koch; Director for Development / Design

13