SCHUNK ROTA NCA 160 User instructions

Translation of Original Operating Manual
Power Lathe Chuck
ROTA NCA
Assembly and Operating Manual
Superior Clamping and Gripping

Imprint
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02.00|ROTA NCA |en
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: 1155400
Version: 02.00 |26/04/2021|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
H.-D. SCHUNK GmbH & Co.
Spanntechnik KG
Lothringer Str. 23
D-88512 Mengen
Tel. [phone]
Fax [phone]
[email protected]
schunk.com
Customer Management
Tel. [phone]
Fax [phone]
customercentermenge[email protected]k.com
Please read the operating manual in full and keep it close to the product.

Table of Contents
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3
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 ...................................................................................................... 7
2
Basic safety notes .................................................................................................... 8
2.1
Intended use............................................................................................................. 8
2.2
Not intended use ...................................................................................................... 8
2.3
Constructional changes ............................................................................................ 9
2.4
Spare parts................................................................................................................ 9
2.5
Chuck jaws ................................................................................................................ 9
2.6
Environmental and operating conditions............................................................... 10
2.7
Personnel qualification........................................................................................... 11
2.8
Personal protective equipment.............................................................................. 12
2.9
Notes on safe operation......................................................................................... 12
2.10
Transport ................................................................................................................ 13
2.11
Malfunctions........................................................................................................... 13
2.12
Disposal................................................................................................................... 13
2.13
Fundamental dangers............................................................................................. 13
2.13.1
Protection during handling and assembly .................................................. 14
2.13.2
Protection during commissioning and operation ....................................... 14
2.13.3
Protection against dangerous movements................................................. 15
2.13.4
Notes on particular risks ............................................................................. 15
3
Technical data ......................................................................................................... 19
3.1
Chuck data .............................................................................................................. 19
3.2
Clamping force-RPM diagrams............................................................................... 20
3.3
Calculations for clamping force and speed ............................................................ 22
3.3.1
Calculation of the required clamping force in case of a given rpm............ 22
3.3.2
Calculation example: Required initial clamping force Fsp0 for a given rpm n
..................................................................................................................... 25
3.3.3
Calculation of the permissible rpm nzul in case of a given initial clamping
force Fsp0.................................................................................................... 26
3.4
Grades of Accuracy................................................................................................. 27
3.5
Permissible imbalance............................................................................................ 27

Table of Contents
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4
Torques per screw ................................................................................................... 27
5
Assembly................................................................................................................. 28
5.1
Installing and connecting ....................................................................................... 28
5.2
Connection thread draw tube ................................................................................ 29
5.3
Checking the chuck mount ..................................................................................... 30
5.4
Assembly................................................................................................................. 31
5.4.1
Chuck assembly (with cylindrical recess).................................................... 31
5.4.2
Assembly preparation for chuck with reduction or extension flange ........ 34
5.4.3
Assembly preparation for chuck with direct mount................................... 34
6
Function .................................................................................................................. 35
6.1
Function and handling............................................................................................ 35
6.2
Functional testing ................................................................................................... 35
6.3
Replacement or renewal of jaws............................................................................ 36
7
Maintenance ........................................................................................................... 38
7.1
Lubrication.............................................................................................................. 38
7.2
Maintenance intervals............................................................................................ 39
7.3
Disassembling and assembling the chuck .............................................................. 39
8
Spare parts.............................................................................................................. 41
9
Drawing................................................................................................................... 43
10
Declaration of Incorporation ................................................................................... 44
11
Appendix on Declaration of Incorporation, as per 2006/42/EC, Annex II, No. 1 B ..... 45

General
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5
General
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.
Illustrations in this manual are provided for basic understanding
and may differ from the actual product design.
In addition to these instructions, the documents listed under
(1.1.2, Page 6) are applicable.
Presentation of Warning Labels
To make risks clear, the following signal words and symbols are
used for safety notes.
DANGER
Danger 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.
CAUTION
Material damage!
Information about avoiding material damage.
1
1.1
1.1.1

General
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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 documents marked with an asterisk (*) can be downloaded on
our homepage schunk.com
Sizes
This operating manual applies to the following sizes:
•ROTA NCA 160-32
•ROTA NCA 200-52
•ROTA NCA 225-66
•ROTA NCA 280-86
•ROTA NCA 330-104
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, Page 6)
•Observe the ambient conditions and operating conditions,
(2.6, Page 10)
•Observe the specified maintenance and lubrication intervals,
(7, Page 38)
Parts touching the workpiece and wear parts are not included in
the warranty.
* A cycle consists of a complete clamping process ("Open" and
"Close").
1.1.2
1.1.3
1.2

General
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7
Scope of Delivery
1
Power lathe chuck in the version ordered
3
Mounting screws
6
T-nuts with screws or 3 combination T-nuts
1
Assembly key from size 280
1
Eye bolt
1.3

Basic safety notes
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Basic safety notes
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, Page 19).
•The product is intended for industrial and industry-oriented
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, Page 19)
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, Page 19)
•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
2.1
2.2

Basic safety notes
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9
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.
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.
Chuck jaws
Requirements of the chuck jaws
Stored energy can make the product unsafe and poses 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 constructional reasons the special chuck jaws are heavier
than the top jaws assigned to the lathe chuck, greater
centrifugal forces must be accounted for when defining the
required clamping force and the recommended speed.
2.3
2.4
2.5

Basic safety notes
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•The maximum recommended speed 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 test before being used again. Damaged
parts must be replaced with original SCHUNK spare parts.
•Renew the chuck jaw mounting screws if there are signs of
wear or damage. Only use screws with a quality of 12.9.
•Screw the jaw mounting screws into the bore holes furthest
apart.
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, Page 19).
•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
(7.2, Page 39).
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.
2.6

Basic safety notes
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11
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, Page 38).
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.
The following personal qualifications are necessary for the various
activities related to the product:
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.
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 persons were instructed by the operator about the
delegated tasks and possible dangers due to improper behaviour.
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.
2.7
Trained electrician
Qualified personnel
Instructed person
Service personnel of
the manufacturer

Basic safety notes
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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.
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.
2.8
2.9

Basic safety notes
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13
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.
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.
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.
Fundamental dangers
General
•Observe safety distances.
•Never deactivate safety devices.
•Before commissioning the product, take appropriate protective
measures to secure the danger zone.
2.10
2.11
2.12
2.13

Basic safety notes
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•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.
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.
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.
2.13.1
2.13.2

Basic safety notes
02.00|ROTA NCA |en
15
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.
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.
2.13.3
2.13.4

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
automated 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.
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
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17
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
Danger of slipping and falling in case of dirty environment
where the chuck is used (e.g. by cooling lubricants or oil).
•Ensure that the working environment is clean before starting
assembly and installation work.
•Wear suitable safety shoes.
•Follow the safety and accident-prevention regulations when
operating the chuck, especially when working with machine
tools 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.

Basic safety notes
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CAUTION
Risk of burns due to workpieces with high temperatures.
•Wear protective gloves when removing the workpieces.
•Automatic loading is preferred.
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
workpiece, the base and top jaws may become damaged.
•The T-nuts for connecting the top jaws to the base jaws must
not protrude beyond the base jaws in the radial direction.
•The diameter of the workpiece may not be bigger than the
chuck diameter.
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.

Torques per screw
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19
Technical data
Chuck data
ROTA NCA
160
200
225
280
330
Max. actuating force [kN] *
20
32
45
63
72
Max. clamping force [kN]
45
72
100
140
160
Max. speed [rpm]
5500
5000
5000
4000
3500
Stroke per jaw [mm]
4
5.3
5.3
5.3
5.3
Piston stroke [mm]
15
20
20
20
20
Chuck through bore [mm]
32
52
66
86
104
Weight [kg]
11.5
19.6
29
42
62.8
Centrifugal torque of base jaw
[kgm] McGB
0.039
0.089
0.153
0.348
0.478
Operating temperature
+ 15°C to + 60°C
* For I.D. clamping, the maximum actuating force must be reduced
by 30%.
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 RPM for the specific machining has to
be defined by the user on the basis of the required clamping
forces. This speed must not exceed the maximum speed of the
chuck.
Ensure minimal weight for all jaws.
For unhardened top jaws or chuck jaws in special design, the
permissible RPM according to VDI 3106 must be determined by
means of calculation for the respective machining job. In this,
however, the recommended maximum speed must not be
exceeded. The calculated values must be checked by 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
3.1

Torques per screw
20
02.00|ROTA NCA |en
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 graph
F/3
Clamping force per jaw
Fmax
Max. actuating force
rs
Radius of centre
S
center of gravity
Clamping force/RPM graph for ROTA NCA 160-32
3.2