SCHUNK ROTA THW3 200 User instructions

Translation of Original Operating Manual
Power Chuck
ROTA THW3
Assembly and Operating Manual

Imprint
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Imprint
Copyright:
This manual is protected by copyright. The author is SCHUNK GmbH & Co. KG. All rights
reserved.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 1440828
Version: 06.00|15/11/2022|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]
[email protected]
Please read the operating manual in full and keep it close to the product.

Table of Contents
Table of Contents
1 General.................................................................................................................... 5
1.1 About this manual ................................................................................................ 5
1.1.1 Presentation of Warning Labels ...............................................................5
1.1.2 Applicable documents ..............................................................................6
1.1.3 Sizes ..........................................................................................................6
1.2 Warranty .............................................................................................................. 6
1.3 Scope of Delivery.................................................................................................. 6
2 Basic safety notes ................................................................................................... 7
2.1 Intended use......................................................................................................... 7
2.2 Not intended use.................................................................................................. 7
2.3 Constructional changes ........................................................................................ 7
2.4 Spare parts ........................................................................................................... 8
2.5 Chuck jaws............................................................................................................ 8
2.6 Environmental and operating conditions ............................................................. 9
2.7 Personnel qualification......................................................................................... 9
2.8 Personal protective equipment.......................................................................... 10
2.9 Notes on safe operation ..................................................................................... 11
2.10 Transport ............................................................................................................ 11
2.11 Malfunctions....................................................................................................... 11
2.12 Disposal .............................................................................................................. 12
2.13 Fundamental dangers......................................................................................... 12
2.13.1 Protection during handling and assembly ..............................................12
2.13.2 Protection during commissioning and operation ...................................13
2.13.3 Protection against dangerous movements.............................................13
2.13.4 Notes on particular risks.........................................................................13
3 Technical data.........................................................................................................16
3.1 Chuck data.......................................................................................................... 16
3.2 Clamping force-RPM diagrams ........................................................................... 17
3.3 Calculations for clamping force and speed......................................................... 20
3.3.1 Calculation of the required clamping force in case of a given rpm ........20
3.3.2 Calculation example: Required initial clamping force Fsp0 for a given rpm n . 23
3.3.3 Calculation of the permissible rpm nzul in case of a given initial
clamping force Fsp0 ................................................................................24
3.4 Grades of Accuracy............................................................................................. 25
3.5 Permissible imbalance........................................................................................ 25
4 Torques per screw ..................................................................................................26
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Table of Contents
5 Assembly ................................................................................................................27
5.1 Installing and connecting.................................................................................... 27
5.2 Connection thread draw tube ............................................................................ 28
5.3 Checking the chuck mount ................................................................................. 29
5.4 Assembly ............................................................................................................ 29
5.4.1 Chuck assembly (with cylindrical recess)................................................30
5.4.2 Assembly preparation for chuck with reduction or extension flange ....33
6 Function .................................................................................................................34
6.1 Function and handling ........................................................................................ 34
6.2 Base jaw position................................................................................................ 35
6.3 Replacement or renewal of jaws ........................................................................ 35
6.4 Functional testing ............................................................................................... 36
7 Maintenance ..........................................................................................................37
7.1 Lubrication.......................................................................................................... 37
7.2 Technical condition............................................................................................. 38
7.3 Maintenance intervals........................................................................................ 39
7.4 Disassembling and assembling the chuck........................................................... 40
8 Spare parts .............................................................................................................44
9 Drawing ..................................................................................................................46
10 Declaration of Incorporation...................................................................................50
11 Appendix on Declaration of Incorporation, as per 2006/42/EC, Annex II, No. 1 B ....51
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General
1 General
1.1 About this manual
This manual contains important information for a safe and
appropriate use of the product.
This manual is an integral part of the product and must be kept
accessible for the personnel at all times.
Before starting work, the personnel must have read and
understood this operating manual. Prerequisite for safe working is
the observance of all safety instructions in this manual.
In addition to these instructions, the documents listed
under }1.1.2 [/6] are applicable.
NOTE: The illustrations in this manual are intended to provide
a basic understanding and may deviate from the actual version.
1.1.1 Presentation of Warning Labels
To make risks clear, the following signal words and symbols are
used for safety notes.
DANGER
Dangers for persons!
Non-observance will inevitably cause irreversible injury or death.
WARNING
Dangers for persons!
Non-observance can lead to irreversible injury and even death.
CAUTION
Dangers for persons!
Non-observance can cause minor injuries.
NOTICE
Material damage!
Information about avoiding material damage.
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General
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1.1.2 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 *
• Quick guide THW3
The documents labeled with an asterisk (*) can be downloaded
from schunk.com.
1.1.3 Sizes
This operating manual applies to the following sizes:
• ROTA THW3 200-52
• ROTA THW3 225-66
• ROTA THW3 265-81
• ROTA THW3 315-104
• ROTA THW3 400-128
• ROTA THW3 500-165
• ROTA THW3 630-165
1.2 Warranty
The warranty period is 24 months after delivery date from factory
or 500 000 cycles*, if it is used as intended, under the following
conditions:
• Observe the applicable documents, }1.1.2 [/6]
• Observe the ambient conditions and operating
conditions, }2.6 [/9]
• Observe the specified maintenance and lubrication
intervals, }7 [/37]
Parts touching the workpiece and wear parts are not included in
the warranty.
* A cycle consists of a complete clamping process
("Open" and "Close").
1.3 Scope of Delivery
1 Power lathe chuck in the version ordered
1 Set of base jaws
3 Mounting screws
1 Jaw change key
1 Eye bolt from size 225
1 Assembly key from size 265
1 Operating manual
1 Quick guide

Basic safety notes
2 Basic safety notes
2.1 Intended use
This product is intended for clamping workpieces on machine tools
and other suitable technical devices.
• The product may only be used within the scope of its technical
data, }3 [/16].
• The product is intended for industrial and commercial use.
• Appropriate use of the product includes compliance with all
instructions in this manual.
• 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”). }3 [/16]
2.2 Not intended use
A not intended use of the product is for example:
• It is used as a press, a punch, a toolholder, a load-handling
device or as lifting equipment.
• the product is used for unintended machines or workpieces.
• the technical data is exceeded when using the
product. }3 [/16]
• if workpieces are not clamped properly, paying particular
attention to the clamping forces specified by the manufacturer.
• if it is used in working environments that are not permissible.
• if the product is operated without a protective cover.
2.3 Constructional changes
Implementation of structural changes
By conversions, changes, and reworking, e.g. additional threads,
holes, or safety devices can impair the functioning or safety of the
product or damage it.
• Structural changes should only be made with the written
approval of SCHUNK.
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Basic safety notes
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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.
• Use only original spare parts or spares authorized by SCHUNK.
2.5 Chuck jaws
Requirements of the chuck jaws
Accumulated energy can make the product unsafe and risk the
danger of serious injuries and considerable material damage.
• Only change chuck jaws if no residual energy can be released.
• Do not use welded jaws.
• 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).
• If, for design reasons, the special chuck jaws are heavier than
the top jaws assigned to the lathe chuck, greater centrifugal
forces must be taken into account when defining the required
clamping force and the recommended speed of rotation.
• The maximum recommended speed of rotation may only be
operated in conjunction with maximum actuating force and only
with the lathe chuck in optimum, fully functioning condition.
• After a collision, the lathe chuck and the chuck jaws must be
subjected to a crack detection test before being used again.
Damaged parts must be replaced with original SCHUNK spare
parts.
• Renew the chuck jaw mounting bolts if there are signs of wear
or damage. Only use bolts with a quality of 12.9.

Basic safety notes
2.6 Environmental 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 to the product's life span.
• Make sure that the product is used only in the context of its
defined application parameters, }3 [/16].
• Make sure that the product is a sufficient size for the
application.
• Only use high-quality cooling emulsions with anti-corrosive
additives during processing.
Clamping force measurement
Depending on the operating conditions, the function and clamping
force must be checked after a certain period of
operation }7.1 [/37].
With the smallest possible actuating pressure (hydraulic cylinder),
the base jaws should move evenly. This method only provides
a limited indication and is not a substitute for measuring the
clamping force.
If the clamping force has dropped too much or if the base jaws and
piston no longer move properly, the chuck must be disassembled,
cleaned, and relubricated }7 [/37].
2.7 Personnel qualification
Inadequate qualifications of the personnel
If the personnel working with the product is not sufficiently
qualified, the result may be serious injuries and significant
property damage.
• All work may only be performed by qualified personnel.
• Before working with the product, the personnel must have read
and understood the complete assembly and operating manual.
• Observe the national safety regulations and rules and general
safety instructions.
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Basic safety notes
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The following personal qualifications are necessary for the various
activities related to the product:
Trained electrician Due to their technical training, knowledge and experience, trained
electricians are able to work on electrical systems, recognize and
avoid possible dangers and know the relevant standards and
regulations.
Qualified personnel Due to its technical training, knowledge and experience, qualified
personnel is able to perform the delegated tasks, recognize and
avoid possible dangers and knows the relevant standards and
regulations.
Instructed person Instructed persons were instructed by the operator about the
delegated tasks and possible dangers due to improper behaviour.
Service personnel of
the manufacturer
Due to its technical training, knowledge and experience, service
personnel of the manufacturer is able to perform the delegated
tasks and to recognize and avoid possible dangers.
2.8 Personal protective equipment
Use of personal protective equipment
Personal protective equipment serves to protect staff against
danger which may interfere with their health or safety at work.
• When working on and with the product, observe the
occupational health and safety regulations and wear the
required personal protective equipment.
• Observe the valid safety and accident prevention regulations.
• Wear protective gloves to guard against sharp edges and
corners or rough surfaces.
• Wear heat-resistant protective gloves when handling hot
surfaces.
• Wear protective gloves and safety goggles when handling
hazardous substances.
• Wear close-fitting protective clothing and also wear long hair in
a hairnet when dealing with moving components.

Basic safety notes
2.9 Notes on safe operation
Incorrect handling of the personnel
Incorrect handling and assembly may impair the product's safety
and cause serious injuries and considerable material damage.
• Avoid any manner of working that may interfere with the
function and operational safety of the product.
• Use the product as intended.
• Observe the safety notes and assembly instructions.
• Do not expose the product to any corrosive media. This does
not apply to products that are designed for special
environments.
• Eliminate any malfunction immediately.
• Observe the care and maintenance instructions.
• Observe the current safety, accident prevention and
environmental protection regulations regarding the product's
application field.
2.10 Transport
Handling during transport
Incorrect handling during transport may impair the product's
safety and cause serious injuries and considerable material
damage.
• When handling heavy weights, use lifting equipment to lift the
product and transport it by appropriate means.
• Secure the product against falling during transportation and
handling.
• Stand clear of suspended loads.
2.11 Malfunctions
Behavior in case of malfunctions
• Immediately remove the product from operation and report the
malfunction to the responsible departments/persons.
• Order appropriately trained personnel to rectify the
malfunction.
• Do not recommission the product until the malfunction has
been rectified.
• Test the product after a malfunction to establish whether it still
functions properly and no increased risks have arisen.
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Basic safety notes
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2.12 Disposal
Handling of disposal
The incorrect handling of disposal may impair the product's safety
and cause serious injuries as well as considerable material and
environmental harm.
• Follow local regulations on dispatching product components for
recycling or proper disposal.
2.13 Fundamental dangers
General
• Observe safety distances.
• Never deactivate safety devices.
• Before commissioning the product, take appropriate protective
measures to secure the danger zone.
• Disconnect power sources before installation, modification,
maintenance, or calibration. Ensure that no residual energy
remains in the system.
• If the energy supply is connected, do not move any parts by
hand.
• Do not reach into the open mechanism or movement area of
the product during operation.
2.13.1 Protection during handling and assembly
Incorrect handling and assembly
Incorrect handling and assembly may impair the product's safety
and cause serious injuries and considerable material damage.
• Have all work carried out by appropriately qualified personnel.
• For all work, secure the product against accidental operation.
• Observe the relevant accident prevention rules.
• Use suitable assembly and transport equipment and take
precautions to prevent jamming and crushing.
Incorrect lifting of loads
Falling loads may cause serious injuries and even death.
• Stand clear of suspended loads and do not step into their
swiveling range.
• Never move loads without supervision.
• Do not leave suspended loads unattended.

Basic safety notes
2.13.2 Protection during commissioning and operation
Falling or violently ejected components
Falling and violently ejected components can cause serious injuries
and even death.
• Take appropriate protective measures to secure the danger
zone.
• Never step into the danger zone during operation.
2.13.3 Protection against dangerous movements
Unexpected movements
Residual energy in the system may cause serious injuries while
working with the product.
• Switch off the energy supply, ensure that no residual energy
remains and secure against inadvertent reactivation.
• Never rely solely on the response of the monitoring function to
avert danger. Until the installed monitors become effective,
it must be assumed that the drive movement is faulty, with its
action being dependent on the control unit and the current
operating condition of the drive. Perform maintenance work,
modifications, and attachments outside the danger zone
defined by the movement range.
• To avoid accidents and/or material damage, human access to
the movement range of the machine must be restricted. Limit/
prevent accidental access for people in this area due through
technical safety measures. The protective cover and protective
fence must be rigid enough to withstand the maximum possible
movement energy.
EMERGENCY STOP switches must be easily and quickly
accessible. Before starting up the machine or automated
system, check that the EMERGENCY STOP system is working.
Prevent operation of the machine if this protective equipment
does not function correctly.
2.13.4 Notes on particular risks
DANGER
Risk of fatal injury from suspended loads!
Falling loads can cause serious injuries and even death.
•Stand clear of suspended loads and do not step within their
swiveling range.
•Never move loads without supervision.
•Do not leave suspended loads unattended.
•Wear suitable protective equipment.
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Basic safety notes
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DANGER
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 lathe 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.
•The machine manufacturer and the operator of the machine
must carry out and document a hazard assessment and risk
analysis to ensure that suitable measures are taken to
maintain the lathe chuck's clamping force until the machine
comes to a standstill and the workpiece can be secured
(e.g. using a crane or suitable lifting equipment).
•The machines and equipment must fulfill the minimum
requirements of the EC Machinery Directive; specifically,
they must have effective technical measures to protect
against potential mechanical hazards.
•Perform regular maintenance.
DANGER
Possible risk of fatal injury to operating personnel if a jaw
breaks or if the lathe 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
lathe chuck must never be exceeded.
•The lathe chuck may only be used on machines and facilities
that fulfill the minimum requirements of the EC Machinery
Directive; specifically, they must have effective technical
measures to protect against possible mechanical hazards.

Basic safety notes
DANGER
Possible risk of fatal injury to operating personnel from clothing
or hair being caught on the lathe chuck and being dragged into
the machine
Loose clothing or long hair may become caught on projecting
parts of the lathe chuck and be drawn into the machine.
•The machines and equipment must fulfill the minimum
requirements of the EC Machinery Directive;
specifically, they must have effective technical measures to
protect against potential mechanical hazards.
•Always wear tight-fitting clothing and a hairnet when working
on the machine and the lathe chuck.
CAUTION
Risk of limbs being crushed when opening and closing the chuck
jaws during manual loading or unloading or when exchanging
moving parts.
•Do not reach between the chuck jaws.
•Wear protective gloves.
•Follow the safety and accident prevention regulations when
operating the chuck, especially when working with machine
tools and other technical equipment.
CAUTION
Risk of damage due to incorrect choice of clamping position for
chuck jaws on workpiece.
If an incorrect clamping position is chosen for the chuck jaws on
the workpiece, the base and top jaws may become damaged.
•Observe maximum positions of base and top jaws.
•The diameter of the workpiece may not be bigger than the
chuck diameter.
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Technical data
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3 Technical data
3.1 Chuck data
ROTA THW3 200 225 265 315 400 500 630
Max. actuating force [kN] 38 41 59 80 128 128 128
Max. clamping force [kN] 64 82 115 150 240 240 240
Max. speed [RPM]* 6000 5400 4000 3600 3000 2200 1700
Stroke per jaw [mm] 6.7 7.4 8.2 8.6 8.6 10.5 10.5
Piston stroke [mm] 17.5 21 24 25 25 30 30
Chuck bore [mm] 52 66 81 104 128 165 165
Centrifugal torque of base jaw *
[kgm] McGB
0.048 0.095 0.198 0.457 0.503 1.550 2.225
Operating temperature +15°C to +60°C
Weight [kg]
ISO 702-4 No. 5 18.6 - - -
ISO 702-1 No. 5 (19.6) - - -
ISO 702-4 No. 6 - 25.1 - -
ISO 702-1 No. 6 - (26.1) - -
ISO 702-4 No. 8 - - 43.3 58.1
ISO 702-1 No. 8 - - (46.3) (61.1)
ISO 702-4 No. 11 103.2
ISO 702-1 No. 11 110.3 225.1
ISO 702-1 No. 15 199.1
ISO 702-1 No. 15 129.2 209.3
ISO 702-4 No. 20 292
* The specified centrifugal torque of the base jaw has been
calculated in the radially outermost position of the base jaw. For
other positions, it is necessary to specifically determine this data.
Calculation examples can be found in the "Technology" chapter of
the SCHUNK lathe chuck catalog.
The maximum RPM stated is only valid with the maximum
clamping force and when using the hard standard chuck jaws that
go with the chuck.
The maximum permissible speed of rotation for the specific
machining has to be defined by the user on the basis of the
required clamping forces. This speed of rotation must not exceed
the maximum speed of rotation of the lathe chuck.

Technical data
Ensure minimal weight for all jaws.
For unhardened top jaws or special chuck jaws, the permissible
speed of rotation according to VDI 3106 must be determined by
means of calculation for the respective machining job whereby the
maximum recommended speed must not be exceeded. The
calculated values must be verified by means of a dynamic
measurement. Function monitoring (piston movement and
actuating pressure) must be performed in accordance with the
guidelines of the Berufsgenossenschaft (employers' mutual
insurance association).
3.2 Clamping force-RPM diagrams
Clamping force/RPM curves have been calculated using the
corresponding standard top jaws (stepped jaws and monoblock
jaws). In the determination process, the maximum actuating force
was applied and the jaws were set flush with the outer diameter of
the chuck.
The chuck is in perfect condition and lubricated with
SCHUNK LINOMAX plus special grease.
If one or more of these prerequisites is modified, the graphs will
no longer be valid.
Chuck setup for clamping force/RPM diagram
Measuring
point
FspB Clamping force per jaw Fmax Max. actuating force
rsCenter of gravity radius S Center of gravity
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Technical data
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Clamping force/RPM diagram for ROTA THW3 200-52
Minimum required
clamping force 33%
Speed of rotation n [RPM]
Clamping force Fsp [kN]
-1
Clamping force/RPM diagram for ROTA THW3 225-66
Minimum required
clamping force 33%
Clamping force Fsp [kN]
Speed of rotation n [RPM]
-1
Clamping force/RPM diagram for ROTA THW3 265-81
Minimum required
clamping force 33%
Clamping force Fsp [kN]
Speed of rotation n [RPM]
-1

Technical data
Clamping force/RPM diagram for ROTA THW3 315-104
Minimum required
clamping force 33%
Clamping force Fsp [kN]
Speed of rotation n [RPM]
-1
Clamping force/RPM diagram for ROTA THW3 400-128
Speed of rotation n [RPM]
Clamping force Fsp [kN]
Minimum required
clamping force 33%
-1
Clamping force/RPM diagram for ROTA THW3 500-165
Speed of rotation n [RPM]
Clamping force Fsp [kN]
Minimum required
clamping force 33%
-1
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Technical data
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Clamping force/RPM diagram for ROTA THW3 630-165
Speed of rotation n [RPM]
Clamping force Fsp [kN]
Minimum required
clamping force 33%
-1
3.3 Calculations for clamping force and speed
Missing information or specifications can be requested from the
manufacturer.
Legend
FcTotal centrifugal force [N] McAB Centrifugal torque of top jaws [Kgm]
Fsp Effective clamping force [N] McGB Centrifugal torque of base jaws [Kgm]
Fspmin Minimum required clamping force
[N]
n Speed [rpm]
Fsp0 Initial clamping force [N] rsCenter of gravity radius [m]
Fspz Cutting force [N] rsAB Center of gravity radius of top jaw [m]
mAB Mass of one top jaw [kg] ssp Safety factor for clamping force
mBMass of chuck jaw set [kg] szSafety factor for machining
McCentrifugal force torque [Kgm] ΣsMax. clamping force of chuck [N]
3.3.1 Calculation of the required clamping force in case of a given rpm
The initial clamping force Fsp0 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 rotation, 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 Fsp0 and the total centrifugal
force Fc is the effective clamping force Fsp.
(–) for gripping from the outside inwards
(+) for gripping from the inside outwards