SCHUNK ROTA NCK plus User instructions

Translation of the original operating manual

Power Chuck

ROTA NCK plus

Assembly and operating manual

Superior Clamping and Gripping

Imprint

2 02.00|ROTA NCK plus |en

Imprint

This manual remains the copyrighted property of SCHUNK GmbH & Co. KG. It is solely

supplied to our customers and operators of our products and forms part of the product.

This documentation may not be duplicated or made accessible to third parties, in particu-

lar competitive companies,

without our prior permission.

Technical changes:

We reserve the right to make alterations for the purpose of technical improvement.

Document number: 0889048-en

Edition: 02.00 |09/03/2017|en

Dear customer,

congratulations on choosing a SCHUNK product. By choosing SCHUNK, you have opted for

the highest precision, top quality and best service.

You are going to increase the process reliability of your production and achieve best

machining results – to the customer's complete satisfaction.

SCHUNK products are inspiring.

Our detailed assembly and operation manual will support you.

Do you have further questions? You may contact us at any time – even after purchase.

Kindest Regards

Your H.-D. SCHUNK GmbH & Co.

Spanntechnik KG

Lothringer Str. 23

D-88512 Mengen

Tel. +49–7572-7614-0

Fax +49-7572-7614-1099

[email protected]

www.schunk.com

Table of contents

02.00|ROTA NCK plus |en

Table of contents

General .................................................................................................................... 5

1.1

Warnings................................................................................................................... 5

1.2

Applicable documents .............................................................................................. 6

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............................................................................ 13

2.5

Personnel qualification........................................................................................... 14

2.6

Organizational measures........................................................................................ 14

2.7

Using personal protective equipment.................................................................... 15

Warranty................................................................................................................. 16

Torques per screw ................................................................................................... 17

Scope of Delivery..................................................................................................... 18

Technical data ......................................................................................................... 19

6.1

Chuck data .............................................................................................................. 19

6.2

Clamping force / speed diagrams........................................................................... 20

6.3

Calculations for clamping force and speed ............................................................ 22

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 Fsp0 for a given rpm n

..................................................................................................................... 24

6.3.3

Calculation of the permissible rpm nzul in case of a given initial clamping

force Fsp0 .................................................................................................... 26

6.4

Grades of Accuracy................................................................................................. 26

6.5

Permissible imbalance............................................................................................ 26

Mounting of the Chuck to the Machine Spindle ....................................................... 27

7.1

Inspection of the spindle nose for mounting the chuck flange ............................. 27

7.2

Threading of drawnut............................................................................................. 28

7.3

Mounting ................................................................................................................ 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 ...................................... 31

7.3.3

Mounting the ROTA NCKplus Chuck with straight recess mount ............. 33

Function .................................................................................................................. 36

8.1

Function and handling............................................................................................ 36

8.2

Replacement or renewal of jaws............................................................................ 36

Table of contents

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8.3

Disassembly and assembly of the Chuck................................................................ 37

Maintenance ........................................................................................................... 38

9.1

Lubrication.............................................................................................................. 38

9.2

Changing the top jaws ............................................................................................ 39

9.3

Maintenance intervals............................................................................................ 39

Disposal .................................................................................................................. 40

Assembly drawing ................................................................................................... 41

Spare parts.............................................................................................................. 42

Translation of original EC declaration of incorporation ............................................ 43

General

02.00|ROTA NCK plus |en

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, espe-

cially 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

General

6 02.00|ROTA NCK plus |en

WARNING

Warning about hand injuries

WARNING

Warning about hot surfaces

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 www.schunk.com.

1.2

Basic safety instructions

02.00|ROTA NCK plus |en

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 tech-

nical data specified by the manufacturer. The technical data speci-

fied 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 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 de-

vice or as lifting equipment.

• the product is used for unintended machines or workpieces.

• the technical data is exceeded when using the product. (6,

Page 19)

• if workpieces are not clamped properly, paying particular at-

tention 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.

2.1

2.2

Basic safety instructions

8 02.00|ROTA NCK plus |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 au-

tomated 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 main-

tain 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 re-

quirements of the EC Machinery Directive; specifically, they

must have effective technical measures to protect against po-

tential 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 Di-

rective; specifically, they must have effective technical

measures to protect against possible mechanical hazards.

2.3

Basic safety instructions

02.00|ROTA NCK plus |en

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 re-

quirements of the EC Machinery Directive; specifically, they

must have effective technical measures to protect against po-

tential 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, instal-

lation or removal.

• Take special care in the danger zone when transporting, in-

stalling 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 NCK plus |en

CAUTION

Danger of limbs being crushed by opening and closing of the

chuck jaws during manual loading and unloading or when re-

placing 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 machin-

ing 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.

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