SCHUNK SPK 140 User instructions

Translation of Original Operating Manual
Jaw boxes SPK
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: 0889015
Version: 04.00|09/09/2022|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.................................................................................................................... 4
1.1 Warnings .............................................................................................................. 4
1.2 Applicable documents .......................................................................................... 5
2 Basic safety instructions........................................................................................... 6
2.1 Intended use......................................................................................................... 6
2.2 Not intended use.................................................................................................. 7
2.3 Notes on particular risks....................................................................................... 7
2.4 Notes on safe operation ..................................................................................... 10
2.4.1 Substantial modifications .......................................................................12
2.5 Personnel qualification....................................................................................... 13
2.6 Organizational measures.................................................................................... 13
2.7 Using personal protective equipment ................................................................14
3 Warranty ................................................................................................................15
4 Torque per screw ....................................................................................................16
5Scope of delivery ....................................................................................................17
6Technical data.........................................................................................................18
6.1 Permissible speed of rotation for jaw boxes on face plates............................... 18
6.2 Calculations for clamping force and speed.........................................................19
6.2.1 Calculation of the required clamping force in case of a given rpm ........19
6.2.2 Calculation example: Required initial clamping force Fsp0 for a given rpm
n..............................................................................................................22
6.2.3 Calculation example: permissible RPM for a given effective clamping
force........................................................................................................23
6.3 Grades of Accuracy............................................................................................. 24
6.4 Permissible imbalance........................................................................................ 24
7Attachment of the jaw boxes ..................................................................................25
7.1 Preparing the installation ................................................................................... 25
7.2 Mounting the jaw boxes..................................................................................... 26
7.3 Adjustment of the jaw boxes on the face plate.................................................. 26
7.4 Mounting the jaw boxes on intermediate plates ............................................... 27
8Function .................................................................................................................28
8.1 Function of the jaw box...................................................................................... 28
8.2 Important notes.................................................................................................. 28
8.3 Checking the jaw boxes ...................................................................................... 29
9Maintenance and care ............................................................................................30
9.1 Disassembling and assembling the jaw box ....................................................... 30
9.2 Maintenance intervals........................................................................................ 32
10 Spare parts .............................................................................................................33
10.1 Assembly accessories ......................................................................................... 37
11 Assembly drawing...................................................................................................39
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General
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1 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 [/6]
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.
1.1 Warnings
The following key words and symbols are used to highlight
dangers.
DANGER
It threatens an immediate danger.
Non-observance will result in death or irreversible injury.
WARNING
It threatens a possible dangerous situation.
Non-observance may result in death or irreversible injury.
CAUTION
It can be threaten a possible dangerous situation.
Non-observance may result in property damages and injuries.
CAUTION
Informations and Instructions.
Non-observance may result in property damages.

General
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 *
The documents marked with an asterisk (*) can be downloaded on
our homepage schunk.com
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Basic safety instructions
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2 Basic safety instructions
Improper handling, assembly and maintenance of this product
may result in risks 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.
2.1 Intended use
The jaw boxes are suitable for clamping workpieces on face plates
with parallel guided T-slots on machine tools and other suitable
technical equipment, 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 speed of the face plate and the necessary clamping
force must be determined by the operator for each clamping task
in accordance with the valid standards or technical specifications
of the manufacturer.
(See also "Calculations for clamping force and speed of rotation" in
chapter "Technical data".) }6 [/18]

Basic safety instructions
2.2 Not intended use
The jaw box is not being used as intended if, for example:
• It is used as a press, a punch, a toolholder, a load-handling
device or as lifting equipment.
• It is used in working environments that are not permissible.
• Workpieces are not clamped properly, paying particular
attention to the clamping forces specified by the manufacturer.
• People work on machines or technical equipment that do not
comply with the EC Machinery Directive 2006/42/EC,
disregarding the applicable safety regulations.
• The technical data specified by the manufacturer for using the
jaw box are exceeded.
• The jaw box is used with machines/systems or workpieces that
are not designed to be used with it.
2.3 Notes on particular risks
This product may pose a danger to persons and property if,
for example:
• It is not used as intended;
• It is not installed or maintained properly;
• The safety and installation instructions, local applicable safety
and accident prevention regulations or the EC Machinery
Directive are not observed.
DANGER
Possible risk of fatal injury to operating personnel if a jaw
breaks or if the jaw box 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
jaw box must never be exceeded.
•The jaw box may only be used on machines and facilities that
fulfill the minimum requirements of the EC Machinery
Directive 2006/42/EC; specifically, they must have effective
technical measures to protect against possible mechanical
hazards.
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Basic safety instructions
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DANGER
Possible risk of fatal injury to operating personnel from clothing
or hair being caught on the jaw box and being dragged into the
machine!
Loose clothing or long hair may become caught on projecting
parts of the jaw box and be drawn into the machine!
•The machines and equipment must fulfill the minimum
requirements of the EC Machinery Directive 2006/42/EC;
specifically, they must have effective technical measures to
protect against possible mechanical hazards.
•Always wear tight-fitting clothing and a hairnet when working
on the machine and the jaw box.
WARNING
Risk of injury due to dropping the jaw box during transport,
installation or removal.
•Take special care in the danger zone when transporting,
installing or removing the jaw box.
•Note the relevant load securing regulations for working safely
with cranes, ground conveyors, lifting gear and load-handling
equipment.
CAUTION
Risk of slipping or falling if the jaw box's operational
environment is not clean (e.g. contaminated with cooling
lubricants or oil).
•Ensure that the working environment is clean before starting
assembly and installation work.
•Wear suitable safety boots.
•Follow the safety and accident-prevention regulations during
operation of the jaw box, especially when working with
machine tools and other technical equipment.

Basic safety instructions
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 during
operation of the jaw box, especially when working with
machine tools 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
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 jaw box's axial and concentric runout.
•Check options for remedying imbalances on special top jaws
and workpieces.
•Reduce the speed.
•Wear hearing protection.
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Basic safety instructions
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2.4 Notes on safe operation
WARNING
Danger of shifting of the jaw box when the slide is not locked
If the slide is not locked, the jaw box can shift and the workpiece
can be thrown out.
•The workpiece may only be fully clamped when the slide of
the jaw box is locked in the crosswise slot of the face plate.
•All mounting screws must also be tightened with the
maximum permissible tightening torque.
Working with the jaw boxes
When mounting the jaw boxes on the face plate of the machine
tool, the following safety requirements must be observed:
• The number and position of the jaw boxes on the face plate
must be selected so that no imbalance of the machine structure
occurs.
• The working area of the machine operator must not be limited.
Good access to the jaw box must be guaranteed for set-up
work, so that work can be performed safely.
• The base jaws of the individual jaw boxes must be adjusted so
that the workpiece is in the turning center.
• As a rule, the jaw boxes must be locked in place on the face
plate using a crossbar to prevent them from falling out.
• Tighten the fastening screws of the jaw boxes and the
intermediate plates evenly with the permissible torque.
• The clamping force should always be applied using a torque
wrench, but the permissible torque on the drive spindle must
not be exceeded.
• Do not start the machine spindle until the workpiece is clamped
and the spanner wrench has been removed from the clamping
device.
• Turning may only be carried out with a sufficiently clamped
workpiece.
• For safe operation, a protective housing of the machine is
essential.
• The safety specifications from the relevant operating manuals
must be followed precisely.

Basic safety instructions
Observe the care and maintenance instructions.
Maintenance instructions
The jaw box's reliability can only be guaranteed if the operator
complies with the manufacturer's maintenance instructions.
• For lubrication, we recommend our tried and tested special
grease, LINO MAX. Unsuitable lubricants can have a negative
impact on the functioning of the clamping device (clamping
force, coefficient of friction, wear behavior).
(For product information about LINO MAX, see the
"Accessories" chapter of the SCHUNK lathe chuck catalog or
contact SCHUNK.)
• Use a suitable high-pressure grease gun to ensure that you
reach all the greasing areas.
• To ensure correct distribution of the grease, move the
mechanism to its end positions several times with the spanner
wrench.
Safety notes for servicing
Follow all the applicable legal standards 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 jaw
box failure if the maintenance and servicing instructions for the
jaw box are disregarded
The servicing instructions specified by the manufacturer must be
complied with to ensure safe operation of the jaw box.
Work must be carried out by qualified specialist personnel with
the relevant safety training.
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Basic safety instructions
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Use of customized jaws
When using customized jaws, please observe the following rules:
• The chuck jaws should be designed 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.)
• The base jaws with tongue and groove have a frontal
attachment option for special chuck jaws.
• Fasten the mounting screws so as to achieve the greatest
possible effectiveness.
• At high speeds, the jaw boxes may only be used with robust
protective equipment.
• If the clamping device is involved in a collision, it must be
subjected to a crack test before using it again. Damaged parts
must be replaced with original SCHUNK spare parts.
• Renew the mounting bolts on the chuck jaws if there are signs
of wear or damage. Only use screws with a quality of 12.9.
2.4.1 Substantial modifications
Do not carry out any major changes to the jaw box.
If the operator carries out a substantial modification to the jaw
box, the product shall no longer conform to the EC Machinery
Directive 2006/42/EC!

Basic safety instructions
2.5 Personnel qualification
The jaw box must only be installed, removed, started up, operated
and serviced by qualified specialist personnel with the relevant
safety training.
All persons charged with operating, maintaining and servicing this
jaw box must have access to the operating manual, especially the
chapter "Basic safety notes". We recommend that the operator
draw up in-house safety operating instructions.
Trainees may work on machines and technical equipment in which
a jaw box is installed provided that they are supervised at all times
by qualified specialist personnel.
2.6 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 jaw box.
Monitoring 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 jaw box is mounted
are clearly legible and are observed.
Faults
If a fault occurs on the jaw box and this fault endangers safety or
if a problem is suspected due to production characteristics, the
machine tool where the jaw box is mounted must be immediately
stopped and remain shut down until the fault has been located
and remedied. Only allow specialists to remedy malfunctions.
Spare parts
Only ever use original SCHUNK spare parts.
Environmental regulations
Comply with the applicable legal norms when disposing of waste.
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Basic safety instructions
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2.7 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).

Warranty
3 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 [/5]
• Observe the ambient conditions and operating conditions
• Observe the maximum number of clamping cycles }6 [/18]
• Observe the specified maintenance and lubrication
intervals, }9 [/30]
Parts touching the workpiece and wear parts are not included in
the warranty.
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Torque per screw
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4 Torque per screw
Tightening torque for hexagon nuts with collar according to DIN
6331, in conjunction with screws for T-slots according to DIN 787.
(Screw quality 8.8)
Or mounting screws according to DIN EN ISO 4762 in conjunction
with nuts for T-slots according to DIN 508. (Screw quality 10.9)
Applies to the mounting of jaw boxes on face plates with T-slots.
Screw size M16 M20 M24 M30
Tightening torques MA (Nm) 150 308 530 1053
Tightening torques for mounting top jaws on the jaw box.
(Screw quality 12.9)
Screw size M16 M20
Tightening torques MA (Nm) 200 320

Scope of delivery
5 Scope of delivery
1 Jaw box with assembly accessories
Sizes: SPK 140, SPK 180, SPK 220, SPK 260 including hard base
jaw with tongue and groove or base jaw with fine serration
and T-slot
2 Eye bolts DIN 580
1 Operating manual
Scope of delivery: Assembly accessories for jaw box suitable for
machines with T-slots according to DIN 650
4 Screws for T-slots DIN 787
or screws DIN EN ISO 4762
4 Collar nuts DIN 55027
or nuts DIN 6331 - M30
2 T-nuts, flat or fixed
incl. Screws
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Technical data
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6 Technical data
Size 140 180 220 260
Weight [kg] 23 33.5 52.7 68.8
Screws M16 M20 – M24 M20 – M24 M24 – M30
Gauge
Min.
Max.
120
140
140
180
180
220
220
260
max. clamping force [kN] 35 55 68 75
max. tightening torque [Nm] 150 230 330 360
Warranty and maximum clamping cycles
Length of warranty 24 Months
Maximum clamping cycle number 10 000 Cycles
6.1 Permissible speed of rotation for jaw boxes on face plates
CAST IRON face plate with 4 jaw boxes STEEL face plate with 4 jaw boxes
Face plates Ø (mm) Max. rotation speed
[min-1]
Face plates Ø (mm) Max. rotation speed
[min-1]
800 430 800 720
900 380 900 640
1,000 340 1,000 570
1,100 312 1,100 520
1,200 290 1,200 480
1,300 265 1,300 440
1,400 245 1,400 410
1,500 230 1,500 410
1,600 215 1,600 380
1,800 190 1,800 340
2,000 170 2,000 305
2,200 155 2,200 280
2,400 144 2,400 255
2,500 138 2,500 244
The recommended speed is applicable for jaw boxes on face
plates with SCHUNK top jaws with tongue and groove, hard, type
SHF.

Technical data
CAUTION
The guide values for the maximum permissible speeds of
rotation are only valid when the workpiece is exactly aligned on
the face plate, and no imbalance occurs during machining.
The speed of rotation must be reduced for jaws with a higher
weight and workpiece machining with high imbalance!
6.2 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]
6.2.1 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 jaw box
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
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Technical data
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DANGER
Risk to life and limb of the operating personnel and significant
property damage when the RPM limit is exceeded! With
gripping from the outside inwards, and with increasing RPM,
the effective clamping force is reduced by the magnitude of the
increasing centrifugal force (the forces are opposed). When the
RPM limit is exceeded, the clamping force drops below the
required minimum clamping force Fspmin. Consequently, the
workpiece is released spontaneously.
•Do not exceed the calculated RPM.
•Do not fall below the necessary minimum clamping force.
The workpiece
will be
uncontrollably
released in
this area
Speed of rotation
Clamping force
Centrifugal
force
Effective clamping force
Minimum required clamping force
Initial clamping force during shutdown
Reduction in effective clamping force by the magnitude of the total centrifugal force, for gripping from the outside
inwards.
The required effective clamping force for machining Fsp is
calculated from the product of the machining force FspZ and the
safety factor Sz. This factor takes into account uncertainties in the
calculation of the machining force. According to VDI 3106: Sz ≥ 1.5.
From this we can derive the calculation of the initial clamping
force during shutdown:
(+) for gripping from the outside inwards
(–) for gripping from the inside outwards