SCHUNK ROTA NC plus 2 Series User instructions

Translation from the original operating manual
Power chuck
ROTA NC plus 2 / ROTA NCF plus 2
Assembly and Operating Manual
Superior Clamping and Gripping

Imprint
2
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
Imprint
Copyright:
This manual is protected by copyright. The author is SCHUNK GmbH & Co. KG. All rights
reserved. Any reproduction, processing, distribution (making available to third parties),
translation or other usage - even excerpts - of the manual is especially prohibited and
requires our written approval.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 0889127-en
Version: 02.00 |17/06/2019|en
© H.-D. SCHUNK GmbH & Co.
All rights reserved.
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

Table of contents
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
3
Table of contents
1
General .................................................................................................................... 5
1.1
Warnings................................................................................................................... 5
1.2
Applicable documents .............................................................................................. 6
2
Basic safety instructions ........................................................................................... 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
Torques per screw ................................................................................................... 16
5
Scope of delivery ..................................................................................................... 16
6
Technical data ......................................................................................................... 17
6.1
Chuck data .............................................................................................................. 17
6.2
Clamping force / speed diagrams........................................................................... 18
6.3
Calculations for clamping force and speed ............................................................ 21
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 for a given speed .... 24
6.3.3
Calculation of the permissible speed in case of a given initial clamping
force ............................................................................................................ 25
6.4
Grades of Accuracy................................................................................................. 26
6.5
Permissible imbalance............................................................................................ 26
7
Attachment and disassembly of the chuck............................................................... 27
7.1
Pre-assembly measures.......................................................................................... 27
7.2
Inspection of the spindle nose ............................................................................... 28
7.3
Mounting of the chuck ........................................................................................... 29
7.3.1
Mounting the chuck with a reduction or extension flange ........................ 29
7.3.2
Mounting the chuck by means of a direct mount ...................................... 30
7.3.3
Mounting the ROTA NC plus / NCF plus chuck with a centering edge ....... 31
8
Function and handling ............................................................................................. 34
8.1
Function and handling............................................................................................ 34
8.2
Jaw Change or supplement of jaws........................................................................ 34

Table of contents
4
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
8.3
Disassembly and assembly of the Chuck................................................................ 36
9
Maintenance ........................................................................................................... 38
9.1
Lubrication.............................................................................................................. 38
9.2
Maintenance intervals............................................................................................ 39
9.3
Changing the top jaws ............................................................................................ 39
10
Disposal .................................................................................................................. 40
11
Spare parts.............................................................................................................. 40
12
Drawing................................................................................................................... 42
13
Translation of original EC declaration of incorporation ............................................ 43

General
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
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-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.
1
1.1

General
6
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
WARNING
Warning about hand injuries
WARNING
Warning about hot surfaces
Applicable documents
•*
•*
•, "Technology" chapter in the lathe chuck catalog *
The documents marked with an asterisk (*) can be downloaded on
our homepage schunk.com
1.2

Basic safety instructions
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
7
Basic safety instructions
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 original SCHUNK spare parts may be used.
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 17)
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.
(6, Page 17)
•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 instructions
8
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
Notes on particular risks
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.
2.3

Basic safety instructions
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
9
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.
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.
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.

Basic safety instructions
10
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
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%.
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.

Basic safety instructions
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
11
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).
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.
2.4

Basic safety instructions
12
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
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, LINOMAX. Unsuitable lubricants can have a negative
impact on the functioning of the chuck (clamping force,
coefficient of friction, wear characteristics).
(For product information about LINOMAX, 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. 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).

Basic safety instructions
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
13
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.
•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.

Basic safety instructions
14
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
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.
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.
2.4.1
2.5
2.6

Basic safety instructions
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
15
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

Scope of delivery
16
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
Warranty
If the product is used as intended, the warranty is valid for 24
months from the ex-works delivery date under the following
conditions:
•Observe the applicable documents, (1.2, Page 6)
•Observe the ambient conditions and operating conditions
•Observe the maximum number of clamping cycles
(6, Page 17)
•Observe the specified maintenance and lubrication intervals,
(9, Page 38)
Parts touching the workpiece and wear parts are not included in
the warranty.
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
Scope of delivery
1
Power chuck
3
Mounting screws
6
T-nuts with screws or 3 combi T-nuts
1
Mounting wrench (from size 260 and up)
1
Eye boltfrom size 260 and up
1
Operating manual
3
4
5

Technical data
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
17
Technical data
Chuck data
ROTA NC plus 2
ROTA NCF plus 2
Size
185
215
260
315
185
215
260
315
Max. actuating force
[kN]
30
42
60
70
30
42
60
70
Max. clamping force
[kN]
72
100
140
160
72
100
140
160
Max. speed [rpm]
5000
5000
4000
3500
6000
6000
4500
4000
Stroke per jaw [mm]
5.3
5.3
5.3
5.3
5.3
5.3
5.3
5.3
Piston stroke [mm]
20
20
20
20
20
20
20
20
Chuck through bore
[mm]
52
66
86
104
52
66
86
104
Weight [kg]
15.2
20.3
33.3
49
14.3
19.7
32
48.4
Centrifugal force of a
base jaw McGB [kgm]
0.029
0.041
0.087
0.155
–0.011*
–0.03*
–0.04*
–0.094*
Max. jaw eccentricity
of center of gravity in
axial direction amax
[mm]
24
40
40
40
24
40
40
40
Operating
temperature
15 –60°C
* with centrifugal force compensation taken into account
The specified maximum speed of rotation stated only applies when
using the maximum clamping force and the SHB-type, hard,
standard stepped 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 must not exceed the
maximum speed of rotation of the chuck.
Warranty and maximum clamping cycles
Length of warranty
24 Months
Maximum clamping cycle number
500 000 Cycles
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 calculated for the
respective machining job. Whereby the recommended maximum
speed must not be exceeded. The values calculated must be
checked by means of dynamic measurement using a clamping
force tester.
6
6.1

Technical data
18
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
Chuck data for rapid chuck jaw quick change:
Caution! The maximum speed of rotation and the clamping force
can deviate from the default values. These are engraved on the
chuck body and indicated in a customer drawing.
Clamping force / speed diagrams
Clamping force/RPM curves have been determined by using hard
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 special grease.
If one or more of these prerequisites is modified, the graphs will
no longer be valid.
Clamping force RPM graphs for rapid chuck jaw quick change:
are determined separately and announced to the customer.
Chuck setup for clamping force/RPM graph
F/3
Clamping force per jaw
S
Center of gravity
rs
Center of gravity radius
amax
Max. jaw eccentricity of
center of gravity in axial
direction
Fmax
Max. actuating force
6.2

Technical data
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
19
Clamping force RPM graph ROTA NC plus 185-52
Clamping force RPM graph ROTA NC plus 215-66
Clamping force RPM graph ROTA NC plus 260-86

Technical data
20
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
Clamping force RPM graph ROTA NC plus 315-104
Clamping force RPM graph ROTA NC plus 185-52
Clamping force RPM graph ROTA NCF plus 215-66