SCHUNK ROTA NCK-S plus User instructions

Power Chuck
ROTA NCK-S plus
Assembly and Operating Manual
Translation of Original Operating
Manual

Imprint
2 04.00 | ROTA NCK-S plus | Power Chuck | en | 1151460
Imprint
Copyright:
This manual is protected by copyright. The author is SCHUNK SE & Co. KG.
All rights reserved.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 1151460
Version: 04.00|15/11/2023|en
Dear Customer,
Thank you for trusting our products and our family-owned company, the leading technology
supplier of robots and production machines.
Our team is always available to answer any questions on this product and other solutions. Ask
us questions and challenge us. We will find a solution!
Best regards,
Your SCHUNK team
Customer Management
Tel. [phone]
Fax [phone]
[e-mail]
Please read the operating manual in full and keep it close to the product.

Table of contents
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Table of Contents
1 General ............................................................................................. 5
1.1 About this manual............................................................................... 5
1.1.1 Illustration of warning notices ...................................................... 5
1.1.2 Applicable documents ................................................................. 6
1.2 Warranty ........................................................................................... 6
1.3 Scope of delivery................................................................................. 6
2 Basic safety notes................................................................................. 7
2.1 Appropriate use .................................................................................. 7
2.2 Inappropriate use ............................................................................... 7
2.3 Structural changes............................................................................... 8
2.4 Spare parts ........................................................................................ 8
2.5 Ambient conditions and operating conditions ........................................... 8
2.6 Material limitations ............................................................................. 8
2.7 Chuck Jaws ........................................................................................ 9
2.8 Personnel qualifications ....................................................................... 9
2.9 Personal protective equipment .............................................................. 10
2.10 Transport........................................................................................... 10
2.11 Protection during handling and assembly ................................................ 10
2.12 Protection during commissioning and operation ........................................ 10
2.13 Notes on safe operation........................................................................ 11
2.14 Disposal ............................................................................................ 11
2.15 Fundamental dangers .......................................................................... 11
2.16 Protection against dangerous movements ................................................ 12
2.17 Notes on particular risks ....................................................................... 12
3 Technical data ..................................................................................... 14
4 Mounting, disassembling and assembling the lathe chuck.............................. 15
4.1 Torques per screw ............................................................................... 15
4.2 Pre-assembly measures........................................................................ 15
4.3 Mounting the lathe chuck ..................................................................... 16
4.4 Converting to VERO-S interface ............................................................... 16
4.5 Connecting the lathe chuck ................................................................... 17
4.6 Disassembling and assembling the lathe chuck.......................................... 17
4.7 Assembling the lathe chuck................................................................... 18
5 Function and handling .......................................................................... 20
5.1 Function of the lathe chuck................................................................... 20
5.2 Replacement or enlargement of jaws....................................................... 20

Table of contents
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6 Maintenance ....................................................................................... 21
6.1 Lubrication ........................................................................................ 21
6.2 Maintenance and lubrication plan .......................................................... 22
6.3 Technical Condition ............................................................................. 22
7 Storage.............................................................................................. 23
8 Disposal ............................................................................................. 24
9 Parts lists ........................................................................................... 25
10 Assembly drawing ................................................................................ 26

General
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1 General
1.1 About this manual
This manual contains important information for the safe, correct
use of the product.
It is an integral part of the product and must be kept accessible
for personnel at all times.
Personnel must have read and understood this manual before
beginning any work. The observance of all safety notes in this
manual is a prerequisite to ensure safe work processes.
The illustrations are intended to provide a basic understanding
and may deviate from the actual version.
Besides this manual, other documents which apply are those
listed under }1.1.2 [/6]
1.1.1 Illustration of warning notices
To make risks clear, the following signal words and symbols are
used for safety notes.
DANGER
Denotes a hazard with a high degree of risk that, if not avoided,
will result in death or serious injury.
WARNING
Denotes a hazard with a medium degree of risk that, if not
avoided, could result in death or serious injury.
CAUTION
Denotes a hazard with a low degree of risk that, if not avoided,
could result in a minor or moderate injury.
CAUTION
Information about avoiding material damage.

General
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1.1.2 Applicable documents
lGeneral Terms and Conditions *
lCatalog data sheet for the attached product *
lTechnical data sheet for optional attachments *
lApproval drawings
Documents marked with a star (*) can be downloaded at
schunk.com.
1.2 Warranty
The warranty for standard products is 24 months from the date of
delivery from the factory, or 50,000 cycles* for manually
operated clamping devices and 500,000 cycles* for power
operated clamping devices. For special clamping devices, it is 12
months from the date of delivery from the factory, assuming
appropriate use in accordance with the following conditions:
lObserve the applicable documents, }1.1.2 [/6]
lObservance of the ambient conditions and operating
conditions, }2.5 [/8]
lObservance of maintenance and lubrication
intervals, }6.2 [/22]
Parts touching the workpiece and wearing parts are not covered
by the warranty.
* One cycle comprises one complete clamping procedure
("opening" and "closing").
1.3 Scope of delivery
1 Power chuck
6 T-nuts with screws or 3 combination T-nuts
2 WH-M-KDS swivel fittings
1 Jaw change key
1 Eye bolt, starting from size 210
1 Operating manual

Basic safety notes
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2 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.
2.1 Appropriate use
lThe product is used for clamping metal and plastic workpieces
on machine tools.
lThe product may only be used within the scope of its technical
data.
lThe product is designed to be set up on a machine table or
machine pallets.
lThe product is intended for industrial and commercial use.
lAppropriate use of the product includes compliance with all
instructions in this manual.
lUse suitable top jaws with a suitable interface.
l
Clamping workpieces with temperatures between 0°C and 100°C.
l
The outer dimensions of the workpiece must be smaller than or
at most equal to the outer diameter of the clamping device.
lThe workpiece must not undergo plastic deformation while
under clamping force (clamping indentations are permissible).
2.2 Inappropriate use
The product is not being used appropriately if:
lthe product is used as a press or a punch, as a toolholder, as
a lathe chuck, as a drill or as a cutting tool.
lthe technical data specified are exceeded during usage.
lworkpieces are not properly clamped, paying particular
attention to the specified clamping forces.
lthe top jaws are not mounted properly.
lthe product is not being operated properly.
lthe product is operated in the stroke end positions.
lthe guideways are overloaded due to the chuck jaws being
too high or the selected clamping point being too high.
lthe product has been insufficiently maintained.
lthe product is used for turning applications over 100 RPM
without consulting SCHUNK.
lthe product is brought into contact with aggressive media,
especially acids.
lthe product is used in abrasive blasting processes, especially
sandblasting.

Basic safety notes
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2.3 Structural changes
Implementation of structural changes
Modifications, changes or reworking, e.g. additional threads,
holes, or safety devices, can damage the product or impair its
functionality or safety.
lStructural changes should only be made with the written
approval of SCHUNK.
2.4 Spare parts
Use of unauthorized spare parts
Using unauthorized spare parts can endanger personnel and
damage the product or cause it to malfunction.
lOnly use original spare parts and spares authorized by
SCHUNK.
2.5 Ambient conditions and operating conditions
Required ambient conditions and operating conditions
Incorrect ambient and operating conditions can make the
product unsafe, leading to the risk of serious injuries,
considerable material damage and/or a significant reduction in
the service life of the product
lMake sure that the product is only used within its defined
application parameters.
lEnsure that the product is of a sufficient size for the
application.
lEnsure that maintenance and lubricating intervals are
observed.
lWhen machining, use only coolant emulsions with anti-rust
properties.
lDepending on the operating conditions, the function must be
checked after a certain period of operation.
2.6 Material limitations
The product is made of steel alloys, elastomers, aluminum alloys
and brass. In addition, Microgleit LP 410 grease, Branotect anti-
rust oil and Renolit HLT2 are incorporated into the product as
auxiliary and operating materials. The safety data sheet for
Microgleit LP 410 can be found at www.schunk.com.

Basic safety notes
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2.7 Chuck Jaws
Requirements of the chuck jaws
When using chuck jaws, please observe the following rules:
lChange chuck jaws at a standstill and without a clamped
workpiece.
lDo not use welded jaws.
l
Design the chuck jaws to be as low as possible. The clamping
point must be as close as possible to the housing. (clamping
points at a greater distance cause higher surface pressures in the
jaw guides and can significantly reduce the clamping force.)
lIf the clamping point is at a greater distance from the
housing, the operating pressure must be reduced.
l
After a collision, the clamping device and the chuck jaws must
be subjected to a crack detection test before being used again.
Replace damaged parts with original SCHUNK spare parts.
lThe chuck jaw mounting screws and if present, the T-nuts,
must be replaced if there are signs of wear or damage. Only
use screws of quality grade 12.9 in compliance with the
specified tightening torques. For clamping devices with fine
serration, the jaw mounting screws must be screwed into the
holes closest to the clamping point.
2.8 Personnel qualifications
Inadequate qualification of personnel
Any work on the product by inadequately qualified personnel can
lead to serious injuries and considerable material damage.
lAll work must be performed by appropriately qualified
personnel.
lPersonnel must have read and understood the complete
manual before beginning any work on the product.
lObserve country-specific accident prevention regulations and
the general safety notes.
The following personnel qualifications are required for the
various activities on the product:
Qualified electrician Qualified electricians have the professional training, knowledge,
and experience to work on electrical systems, to recognize and
avoid potential dangers, and know the relevant standards and
regulations.
Specialist personnel Specialist personnel have the specialized training, knowledge,
and experience to perform the tasks entrusted to them, to
recognize and avoid potential dangers, and know the relevant
standards and regulations.

Basic safety notes
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Instructed person Instructed persons have been instructed by the operator
regarding the tasks entrusted to them and the potential dangers
of inappropriate behavior.
Manufacturer's service
personnel
The manufacturer's service personnel have the specialized
training, knowledge, and experience to perform the work
entrusted to them and to recognize and avoid potential dangers.
2.9 Personal protective equipment
Use of personal protective equipment
Personal protective equipment serves to protect staff in the event
of a danger that may interfere with their health or safety at
work.
2.10 Transport
Handling during transport
Incorrect handling during transport can make the product unsafe
and risks the danger of serious injuries and considerable material
damage.
lDuring transport and handling, secure the product to prevent
it from falling.
lUse the transport thread on the clamping device.
2.11 Protection during handling and assembly
Incorrect handling and assembly
Incorrect handling and assembly can make the product unsafe
and can risk the danger of serious injuries and considerable
material damage.
lAll work must only be performed by appropriately qualified
personnel.
lSecure the system against accidental operation during all
work.
lUse suitable assembly and transport equipment and take
precautions to prevent jamming and crushing.
2.12 Protection during commissioning and operation
Falling or violently ejected components
Falling and ejected components can lead to serious injury or
death.
lTake suitable protective measures to secure the danger zone.

Basic safety notes
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2.13 Notes on safe operation
Incorrect manner of working by personnel
An incorrect manner of working can make the product unsafe
and risks serious injuries and considerable material damage.
lObserve the safety notes and assembly instructions.
lDo not expose the product to any corrosive media.
Products for special ambient conditions are excluded.
lRectify malfunctions as soon as they occur.
lObserve the care and maintenance instructions.
lObserve the current safety, accident prevention, and
environmental protection regulations for the application field
of the product.
lDo not start the machine spindle until the force has built up
in the chuck jaw and clamping is complete in the permissible
operating range.
lUnclamping may only occur once the machine spindle has
come to a standstill.
IMPORTANT!
Following a longer shutdown period (more than 8 hours), always
re-tension the clamping device in order to compensate for the
setting properties of the clamping situation or possible pressure
losses and the resulting loss of clamping force.
2.14 Disposal
Handling of disposal
Incorrect handling during disposal can make the product unsafe
and risks serious injuries and considerable material and
environmental harm.
lFollow local regulations on dispatching product components
for recycling or proper disposal.
2.15 Fundamental dangers
General
lDisconnect power sources before installation, modification,
maintenance, or calibration. Ensure that no residual energy
remains in the system.
lDo not reach into the open mechanism or movement area of
the product during operation.

Basic safety notes
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2.16 Protection against dangerous movements
Safe condition
1. Clamping force block with workpiece:
Workpiece clamped outside the end positions of the clamping
force block with clamping pressure applied.
2. Clamping force block without workpiece, without clamping or
release pressure applied.
3. Clamping force block with spring force:
Clamped without energy without workpiece.
Special feature: Due to the built-in spring, an opened
clamping force block clamps without release pressure.
Unexpected clamping movements could result if the release
pressure fails. Take suitable measures, e.g. a pilot-controlled
check valve with manual venting.
Unexpected movements
If the system still retains residual energy, serious injuries can be
caused while working on the product.
lEstablish a safe state, switch off the energy supply, ensure
that no residual energy remains and secure against
inadvertent reactivation.
2.17 Notes on particular risks
WARNING
Risk of injury in the event of workpiece loss due to component
failure on the product as a result of exceeding the technical data.
lThe product is only allowed to be used within the scope of its
technical data.
WARNING
Risk of injury due to immediate closing of the product with high
spring force in the event of pneumatic pressure failure (AS variant).
lWait for the system to come to a complete standstill in the
safe state.
lDo not reach into the clamping force block.
WARNING
Danger of crushing due to the chuck jaws moving to the
workpiece during the clamping procedure when loading and
unloading manually.
lDo not reach between the workpiece and the chuck jaw
during the clamping procedure.
lImplement the safety functions according to the integrator's
risk assessment.

Basic safety notes
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WARNING
Risk of injury in the event of workpiece loss due to failure or
pressure reduction.
lImplementing safety functions according to the integrator's
risk assessment.
lEnsure stable pressure supply.
lUse pressure maintenance valves.
WARNING
Risk of injury from falling parts during transport, assembly and
disassembly of the product and its accessories.
lUse suitable load handling equipment for transport.
lDo not linger in the danger zone.
lWear protective equipment (protective shoes).
CAUTION
Ergonomic risk to the musculoskeletal system when lifting and
transporting the product using manual force.
lUse load handling equipment for lifting and transporting.
CAUTION
Allergic reactions or irritation due to skin or eye contact with
lubricants on the product.
lIn case of foreseeable contact with lubricants on the product
(e.g. when lubricating or cleaning),
lwear protective equipment (protective gloves, protective
goggles).
CAUTION
Danger for the operating personnel in case of insufficient
clamping force due to ejection or falling of the workpiece!
Due to settling behavior, the clamping force may decrease over
time.
lEnsure that the clamping pressure is applied to the clamping
force block while the workpiece is being machined.
lRe-clamping of the workpiece with manual or pneumatic
clamping force blocks.

Technical data
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3 Technical data
The standard design of the lathe chuck is only intended for
stationary applications.
ROTA NCK-S plus
Operating data 165 210 250 315
Max. actuating pressure [bar] 195 195 120 120
Max. clamping force [kN] 57 84 111 144
Stroke per jaw [mm] 2.75 3.7 4.4 5.3
Piston stroke [mm] 12 16 19 23
Weight with base jaws [kg] 20.1 31.2 47.6 72.4
Oil consumption per double stroke [cm
3]
33 55 140 214
Operating temperature [°C] 5 to 60
Installation position Any

Mounting, disassembling and assembling the lathe chuck
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4 Mounting, disassembling and assembling the
lathe chuck
The item numbers specified for the corresponding individual
components relate to the chapter Drawings, }10 [/26].
4.1 Torques per screw
Tightening torques for mounting screws used to clamp the
chuck on lathes or other suitable technical equipment (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 for mounting screws used to attach top
jaws onto the chuck (screw quality 12.9)
Screw size M6 M8 M10 M12 M14 M16 M20 M24
Max. admissible torque MA (Nm) 16 30 50 70 130 150 220 450
Tightening torques for the protection sleeve mounting screws
(screw quality 8.8)
Screw size M3 M4 M5 M6
Tightening torques MA (Nm) 1.3 3.0 5.5 9.0
4.2 Pre-assembly measures
Carefully lift the product using 3x transport thread M20 (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, disassembling and assembling the lathe chuck
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4.3 Mounting the lathe chuck
The standard design of the lathe chuck is only intended for
stationary applications.
Mount the lathe chuck at both of the flange openings on the
machine table. T-nuts can be mounted at the flange to align the
lathe chuck.
WH-M-KDS
swivel fittings
for pipe Ø 6 mm 14
Assembly and connection
4.4 Converting to VERO-S interface
It is possible to fasten the lathe chuck to the machine table via a
VERO-S interface with the ROTA NCK-S plus 165 and ROTA NCK-S
plus 210 sizes.
In order to do this, the countersunk screw (item 41) must be
removed and the retrofit kit, composed of the SPA 40 with
cylindrical screw and indexing pin, must be mounted in the bore
holes provided.
Observe the tightening torque of the screws in Chapter 4.
Unscrew the countersunk
screw (item 14)
Screw in the SPA 40
retrofit kit at
the center
Mount the
indexing pin
Ø 12 in the
bore hole
provided
Converting to VERO-S interface

Mounting, disassembling and assembling the lathe chuck
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4.5 Connecting the lathe chuck
The lathe chuck has 2 hydraulic connections. One for OPEN and
one for CLOSED. The thread for the swivel fittings is M10 x 1.
Pressure medium Hydraulic oil according to ISO VG 46,
purity class according to ISO
4406:2021-01 [21/18/13]
Requirement for the pressure
medium
filtered (10 μm), lubricity 30 N/mm2
according to DIN 51347-1:2000-01
Volumetric flow [l/min] max. 9
Oil loss by adhering oil removal max. 0.5 mg/cycle
Pressure
gauge
Closed
Open
NG 6 directional control valve
NG 6 pressure control valve
adjusted to operating pressure
NG 6 flow control valve
adjusted to 9 l/min.
P = pressure
Circuit diagram:
4.6 Disassembling and assembling the lathe chuck
The lathe chuck can only be disassembled once it has been
removed. }4.3 [/16]
lUnscrew the swivel fittings (item 45) and set-screws (item 44).
lUnscrew the screws (item 26) and remove the protection
sleeve (item 14).
lUnscrew the piston cover (item 3).
lRemove the screws (item 27) and disassemble the chuck body
(item 21) from the flange (item 1).
lReverse the flange (item 1) and unscrew the screw (item 41), if
present.
lRemove the screws (item 40) and the guide part (item 5).
When removing the guide part, make sure that the O-rings
(item 61) do not get lost.
l
Unscrew the screws (item 25) and remove the retainer ring (item 29).

Mounting, disassembling and assembling the lathe chuck
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l
Remove the first piston (item 4) and the second piston (item 23).
lRemove the wiper (item 50) from the piston (item 23) (see Fig.
"Assembling the wiper").
l
Push the base jaws (item 22) inwards out of the base jaw guides.
lThe lathe chuck is now disassembled.
lRemove the seals (items 65, 67, 68) and the O-rings (item 61)
from the piston cover (item 3), on the piston (item 4) and on
the guide part (item 5).
Clean all the individual components and check for damage and
wear.
Only original SCHUNK spare parts may be used.
4.7 Assembling the lathe chuck
Lubricate the parts well with LINOMAX special grease paste before
assembling.
CAUTION
Allergic reactions if lubricating grease comes into contact with
the skin.
lWear protective gloves.
Important note:
The wiper must be replaced while assembling the piston and
may not be fitted into the piston beforehand. This would make
it impossible to mount the piston.
The wiper is slid over the guide part and placed on the support
device (two-piece ring). Afterwards, the piston assembly can be
attached to the guide part. The wiper is fitted into the opening
on the piston during the attachment process.
lFasten the guide part (item 5) to the flange (item 1) using the
screws (item 40).
lGrease the wiper (item 50) with Renolit HLT 2 or a equivalent
grease and slide it over the guide part (item 5) and place on
the support device.
lGrease the seals (items 65, 67, 68) with Renolit HLT 2 or a
equivalent grease and fit them to the guide part (item 5).
When assembling the seals, ensure that the one-way seals
(item 65, 68) are installed facing in the right direction.
lInsert the piston (item 4) into the piston (item 23) and secure
using the retainer ring (item 29). Afterwards, fasten the
retainer ring (item 29) with screws (item 25).

Mounting, disassembling and assembling the lathe chuck
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lPlace the piston assembly (items 23, 4, 29) on the guide part
(item 5) and slowly tap downward until the wiper (item 50) is
flush in the piston (item 4).
lRemove the support device.
lInsert the jaws (item 22) into the chuck body (item 21).
lPlace the chuck body (item 21) on the piston assembly (item
23, 4, 29) and insert the piston assembly into the chuck body.
lScrew the piston cover (item 3) on the guide part (item 5).
lInsert the protection sleeve (item 14) and fasten with screws
(item 26).
lFasten the chuck body (item 21) to the flange (item 1) with
screws (item 27).
Support device
(two-piece ring)
as mounting aid Support device
(two-piece ring) as mounting aid
Guide part
Piston assembly
Wiper
Assembling the wiper

Function and handling
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5 Function and handling
The item numbers specified for the corresponding individual
components relate to the chapter Drawings, }10 [/26].
5.1 Function of the lathe chuck
The lathe chuck is actuated hydraulically via the two connections
on the bottom. The resulting axial tensile and pressure forces are
converted to the radial jaw clamping force by the wedge hook
angle in the piston and base jaws.
The clamping and opening path of the chuck jaws is determined
by the clamping piston. The serration of the base jaws can be
used to mount standard jaws as well as special jaws for complex
workpiece shapes. The top jaws are moved or changed in the
open clamping position.
5.2 Replacement or enlargement of jaws
Tighten the jaw mounting screws (screw quality 12.9) to the
specified torque. }4.1 [/15]
WARNING
Risk of injury due to loss of workpiece if it is clamped at the
end of the base jaw stroke.
lAlways clamp the workpiece at half of the base jaw stroke.
Chuck jaws for maximum clamping repeat accuracy must be
turned or ground in the chuck under clamping pressure.
lWhen turning or grinding, ensure that the turning ring or
turning pin is clamped by the top jaws and not by the base
jaws.
Tighten the jaw mounting screws with a torque
wrench, }4.1 [/15].