Rohm DURO-A RC Operational manual

RÖHM GmbH Heinrich-Röhm-Straße 50 89567 Sontheim/Brenz [phone] www.roehm.biz| | | |
(
Translation of the Original Operating Manual
Power chuck with quick-action jaw
replacement DURO-A RC
Version 1.1 • 16.04.2019
Store for reference
ID: 1356503
EN

Table of Contents
DURO-A RC III
Table of Contents
1 About this Operating Manual..................................................................... 5
1.1 Manufacturer Details................................................................................. 5
1.2 Copyright.................................................................................................. 5
1.3 Warranty and Liability ............................................................................... 6
1.4 Conventions of Presentation ..................................................................... 7
1.4.1 Text Display........................................................................................7
1.4.2 Display of Safety and Warning Instructions..........................................7
2 Safety ......................................................................................................... 8
2.1 Intended Use ............................................................................................ 9
2.2 Improper Use.......................................................................................... 10
2.3 Obligations of the Owner......................................................................... 11
2.4 Qualification of Operating and Specialist Personnel................................. 12
2.5 Personal Protective Equipment and Personnel Qualification .................... 13
2.6 General Dangers .................................................................................... 13
2.6.1 Dangers due to Flying Parts.............................................................. 13
2.6.2 Skin Irritation due to Operating Materials........................................... 14
2.6.3 Eye Injuries due to Metal Chips.........................................................14
2.6.4 Risk of Burns due to Hot Surfaces.....................................................14
2.6.5 Dangers due to Imbalanced Workpieces............................................ 14
2.6.6 Dangers due to Power Failure...........................................................15
2.6.7 Danger of Crushing...........................................................................15
2.6.8 Procedure in the Event of Danger and Accidents............................... 16
3 Product Description................................................................................. 17
3.1 About this Power Chuck.......................................................................... 17
3.2 Technical Specifications ......................................................................... 19
3.2.1 Overview of Construction Sizes......................................................... 19
3.2.2 Environmental and Operational Conditions........................................ 20
3.2.3 Clamping Force-Speed Diagram........................................................ 21
3.2.4 Permissible Operating Materials........................................................ 22
4 Transport.................................................................................................. 22
4.1 Personal Protective Equipment and Personnel Qualification .................... 22
4.2 Tapped Holes for Transport Purposes ..................................................... 23
5 Assembly ................................................................................................. 23
5.1 Personal Protective Equipment and Personnel Qualification .................... 24
5.2 Assembly on Intermediate Disk ............................................................... 24

Table of Contents
IV DURO-A RC
5.3 Disassembly / assembly threaded ring / adapter...................................... 25
5.4 Assembly on Machine Spindle................................................................. 28
6 Operation ................................................................................................. 30
6.1 Personal Protective Equipment and Personnel Qualification .................... 31
6.2 Basic Principles ...................................................................................... 32
6.3 Inserting Jaws ........................................................................................ 32
6.4 Adjusting Jaws........................................................................................ 34
6.5 Replacing Jaws....................................................................................... 36
6.6 Clamping the Workpiece ......................................................................... 38
7 Maintenance............................................................................................. 39
7.1 Personal Protective Equipment and Personnel Qualification .................... 39
7.2 Maintenance Interval............................................................................... 40
7.3 Maintenance Work .................................................................................. 40
7.3.1 Lubricating Conical Lubricating Nipples............................................. 41
7.3.2 Lubricating Jaw Guides..................................................................... 42
7.3.3 Checking the Device for Correct Operation........................................42
7.3.4 Checking the Tightness of Screw Connections ..................................43
7.3.5 Inspection of the Power Chuck..........................................................44
8 Storage..................................................................................................... 46
9 Troubleshooting....................................................................................... 46
10 Disposal ................................................................................................... 47

About this Operating Manual | 1
DURO-A RC 5 / 48
1About this Operating Manual
This operating manual describes in detail the use, installation, assembly and
maintenance of the power chuck DURO-A RC. The efficiency of the power
chuck depends primarily on correct use and careful maintenance. This operat-
ing manual serves as the leading document and is provided on delivery of the
product. The personnel must have carefully read and understood the operat-
ing manual before beginning any work. Observance of all safety instructions
and instructions for use in this operating manual is the basic prerequisite for
safe work with the power chuck. In addition to the regulations listed here, the
local and user-related operating instructions and the professional accident
prevention regulations are to be observed.
1.1 Manufacturer Details
RÖHM GmbH
Heinrich-Röhm-Straße 50
D-89567 Sontheim/Brenz
Germany
Tel.: [phone]
Fax: [phone]
Web: www.roehm.biz
E-mail: [email protected]
1.2 Copyright
This operating manual is protected by copyright and is intended for internal
purposes only.
The forwarding of the operating manual to third parties, reproduction by any
means - even in part - as well as use and/or communication of the content
without the permission of the manufacturer is prohibited (except for internal
purposes).
Infringements will lead to claims for compensation. We reserve the right to as-
sert further claims.

1 | About this Operating Manual
6 / 48 DURO-A RC
1.3 Warranty and Liability
Standard warranty 1 year
The warranty period begins with delivery of the goods. The pre-condition for
the warranty is full payment of the purchase price. The operating manual is to
be taken into account in all stages of life of the product.
▪ Observe transport and storage conditions.
▪ Observe commissioning instructions.
▪ Observe maintenance and cleaning instructions.
▪ No warranty on wear parts and parts which come into contact with work-
pieces.
▪ Claims are excluded which are:
◦ due to incorrect handling or the effect /influences of external force
(e.g. scratches, dents, distortions etc.);
◦ due to visible wear and continual use (scratches etc.);
◦ due to incorrect supply of media;
◦ due to conversion, repair or other manipulations on the clamping devices
insofar as this has not been carried out by personnel authorised by RÖHM.
▪ All liability for consequential damage is excluded.
(Incorrect operation or maintenance renders the warranty null and void.)
Extended warranty 3 years
RÖHM GmbH offers a warranty of up to 36 months on the power chuck
DURO-A RC purchased by you after delivery of the goods. The warranty is
extended by a further 12 months in each case (max. 2 times / 36 months) if a
fee-based inspection is carried by RÖHM GmbH within the first 12 months
after purchase of the product.
The owner is responsible for carrying out the inspection measure in time.
▪ All parts coming into contact with wear parts and workpieces are excluded
from the warranty.
▪ The prescribed maintenance intervals must be observed, documented and
signed as legally binding.
▪ Warranty claims are subject to German law.

About this Operating Manual | 1
DURO-A RC 7 / 48
1.4 Conventions of Presentation
1.4.1 Text Display
To improve legibility and comprehension of the text, the following conventions
were agreed:
Text type Marking Function
Operating instruction 1.
2., etc.
Marks a sequence of actions
Marks an individual operating instruction
Ø
Marks an intermediate result of an
operating instruction
ü
End result of an operating instruction
List ▪ Marks elements of a list
Marks comments within a list
Contains useful information or further information.
1.4.2 Display of Safety and Warning Instructions
Safety and warning instructions are marked by pictograms. The signal word
and the colouring show the level of danger.
Observe the safety instructions to prevent personal injury and damage to
property.
DANGER
Indicates an imminently dangerous situation
which may lead to death or permanent personal injury if not avoided.
ØList of all measures which must be taken to prevent con-
sequences.
WARNING
Indicates a possible danger
which may lead to permanent personal injury or death if not avoided.
ØList of all measures which must be taken to prevent con-
sequences.

2 | Safety
8 / 48 DURO-A RC
CAUTION
Indicates a possible danger
which may lead to minor reversible injuries if not prevented.
ØList of all measures which must be taken to prevent con-
sequences.
NOTICE
Indicates a possible danger
which may lead to damage to property if not avoided.
ØList of all measures which must be taken to prevent con-
sequences.
2Safety
Safety instructions and safety equipment serve to prevent accidents and dam-
age when working on the power chuck. The safety instructions contain warn-
ings and basic safety instructions. In addition to the safety instructions in this
chapter, the following chapters contain action-related warnings. Maximum
protection of personnel and the environment from dangers and trouble-free
operation is only possible when all safety instructions and warnings in this op-
erating manual is observed.

Safety | 2
DURO-A RC 9 / 48
2.1 Intended Use
The power chuck DURO-A RC is used to clamp regularly and irregularly
shaped workpieces. Only metal workpieces may be clamped in the power
chuck DURO-A RC. Other materials are only permissible by arrangement with
RÖHM GmbH.
To ensure safe clamping of the workpiece with the machining forces which oc-
cur, the clamped material must have adequate rigidity for the clamping force
and may only be slightly compressible. The clamping force is given in the
clamping force diagram (Clamping Force-Speed Diagram [}21]).
Depending on the construction size of the power chuck DURO-A RC, the max-
imum permissible actuating force and speed must be observed (Overview of
Construction Sizes [}19]).
The power chuck DURO-A RC may be installed in machine tools for cutting
and non-cutting processes. The power chuck DURO-A RC may be installed
and used both horizontally and vertically. Stationary machining without rota-
tion of the power chuck DURO-A RC is permitted. Locking and unlocking is
only permitted with the original safety key of RÖHM GmbH.
The DURO-A RC is a power chuck with individually adjustable jaws. Only ori-
ginal RÖHM base jaws and original RÖHM one-piece jaws may be used.
Third-party makes may impair the safety of the power chuck DURO-A RC and
lead to damage.
The jaws used must comply with the following specifications:
▪ the jaws must be designed as light as possible;
▪ the clamping point of the jaws must lie as close as possible to the power
chuck;
▪ the jaws must be adapted to the size (equal or smaller), the weight (equal
or lighter) and the rigidity (equal or higher) of the jaws assigned to the
power chuck. If the jaws are heavier or larger or if they are less rigid than
the jaws assigned to the power chuck, the higher centrifugal force and the
higher load of the power chuck must be taken into account. The neces-
sary clamping force and maximum speed must be reduced.
The maximum permissible clamping diameter of the jaws and the limits of the
jaws must be observed.
The power chuck DURO-A RC can be used for both wet and dry machining.
The permissible usage and environmental conditions must be observed
(Environmental and Operational Conditions [}20]).
The power chuck DURO-A RC is only intended for commercial use.

2 | Safety
10 / 48 DURO-A RC
2.2 Improper Use
If the power chuck is operated for a purpose other than the intended use as
specified in this operating manual, this is deemed to be improper use.
Any utilisation beyond the scope of the intended use poses risks and is not
approved by RÖHM GmbH.
Improper use refers to the following:
▪ use of the power chuck DURO-A RC for suspending loads;
▪ use of non-OEM parts as replacement parts;
▪ use of a non-OEM safety key;
▪ use of defective jaws (e.g. sprockets on base jaw broken off or cracks in
the jaws);
▪ use of welded jaws;
▪ use of the power chuck DURO-A RC in explosive atmospheres;
▪ operation with the safety key inserted;
▪ operation with unlocked jaws;
▪ operation with modifications not approved by the manufacturer;
▪ operation outside of the defined operating parameters;
▪ operation with insufficient maintenance;
▪ operation without safety equipment;
▪ clamping of unsuitable materials (compressible materials);
▪ clamping of unauthorised materials (plastics, rubber, glass or other non-
metals) without the approval of RÖHM GmbH;
▪ clamping of regular workpieces with an asymmetric position of the jaws;
▪ clamping of workpieces with the safety key inserted;
▪ clamping of workpieces to long workpieces;
▪ clamping of workpieces to heavy workpieces;
▪ eccentric clamping of workpieces (Dangers due to Imbalanced Work-
pieces [}14]);
▪ manipulation of the safety key (e.g. removal of the safety spring).

Safety | 2
DURO-A RC 11 / 48
2.3 Obligations of the Owner
Before all work on and with the power chuck, the operator is to ensure:
▪ that the operating manual is available to the responsible personnel;
▪ that the responsible personnel are sufficiently qualified for their work;
◦ This applies in particular to assembly, maintenance and repair.
▪ that the responsible personnel have read and understood the operating
manual.
◦ RÖHM GmbH recommends that this be documented in a suitable form.
▪ that all safety equipment is correctly mounted and operational;
◦ Safety equipment must never be by-passed, manipulated or shut down.
▪ that the power chuck is in perfect working order;
▪ that all damaged and defective parts are replaced immediately.
The machine manufacturer or the operator has to ensure with suitable meas-
ures that the specified technical data of the power chuck cannot be exceeded
The machine manufacturer or the operator must ensure that the power chuck
can only be operated when the separating safety guard is closed. Exception:
Set-up mode.
In set-up mode:
▪ it must be ensured that no machining can be carried out;
▪ the operating pressure must be reduced to the lowest possible value;
▪ the machine spindle speed must be considerably reduced.
To prevent the tension being released when the tool or machine spindle is ro-
tated, the machine control must be programmed accordingly.
Before initial machining is carried out, the operator must check (e.g. by calcu-
lation) whether the generated clamping force under speed is sufficient with
the existing friction to safely hold the workpiece with the available machining
forces. This also applies to processing access with blunt or broken tools.
The power chuck does not have its own guard and the clamping system is not
self-locking in a mechanically secure way. Therefore, the power chuck may
only be operated via a control which has a safety device. This safety device
must prevent the clamped workpiece / tool from being able to leave the clamp
even if the clamping energy (e.g. electricity, hydraulic system, pneumatic sys-
tem etc.) and under the influence of external forces (e.g. machining force,
centrifugal force).
In the event of a sudden drop or failure of the actuation energy, machining
must be interrupted immediately and the tool or machine spindle stopped im-
mediately.

2 | Safety
12 / 48 DURO-A RC
Before beginning any work, it must be ensured that, in the machine operating
mode “Set-up mode” with the machine door open and with an enabling device,
rotation of the power chuck is only permitted at a reduced speed or a move-
ment on the power chuck is only permitted at reduced speed. Rotational
movements and movements on the power chuck at the same time are not per-
mitted.
2.4 Qualification of Operating and Specialist Personnel
Trained personnel
Trained personnel have been instructed in correct handling and possible
dangers when using the power chuck. In particular, the personnel must have
been instructed in the safety equipment.
Qualified personnel
Personnel without experience of handling a power chuck are exposed to in-
creased risks of injury in the event of incorrect conduct, especially during as-
sembly and maintenance work, due to the clamping movements and forces.
Therefore, the power chuck may only be assembled, maintained and serviced
by persons who have received special training or instruction for this purpose
or who have extensive experience. The qualified personnel must be able to
read and understand the displays (e.g. pressure, force etc.) and to act accord-
ingly. The qualified personnel must have read and understood this operating
manual.
In particular, qualified personnel are:
▪ mechanics
Work on the mechanical equipment may only be carried out by a trained
mechanic or by personnel under the direction and supervision of a trained
mechanic. Work on gas, pneumatic and hydraulic equipment may only be car-
ried out by mechanics trained for this purpose.

Safety | 2
DURO-A RC 13 / 48
2.5 Personal Protective Equipment and Personnel Qualification
When working on and with the power chuck DURO-A RC, personal protective
equipment must be worn. The owner is responsible for providing personal pro-
tective equipment.
▪ Personal protective equipment must be in perfect condition when carrying
out work. Defective safety equipment is to be replaced immediately.
▪ Observe information on personal protective equipment posted in the work-
ing area.
▪ During rotational operation of the power chuck DURO-A RC, no protect-
ive gloves are to be worn! Hand protection is only to be worn during trans-
port, assembly and maintenance and as long as the power chuck
DURO-A RC is at a standstill.
Wear protective gloves
Wear safety goggles
Wear safety shoes
Work on and with the power chuck may only be carried out by qualified oper-
ating and specialist personnel (see Qualification of Operating and Special-
ist Personnel [}12]).
2.6 General Dangers
When using the device there is a special potential of residual risks
▪ during assembly and set-up work,
▪ during operation and
▪ during maintenance and service work.
This potential risk cannot be completely eliminated considering the functional
availability of the operating manual. Therefore, all individual regulations of
this operating manual are to be observed.
2.6.1 Dangers due to Flying Parts
During operation, the connection between the clamped workpiece and the
power chuck DURO-A RC may become loose due to mechanical failure (e.g.
due to defective parts) or incorrect operation (e.g. excessive speed). The
workpiece may then fly out and cause serious crushing and impact injuries.
To prevent cutting and crushing injuries, ensure perfect functioning of the
power chuck DURO-A RC before each operation. Also ensure that unauthor-
ised persons cannot rotate the power chuck DURO-A RC unintentionally.

2 | Safety
14 / 48 DURO-A RC
▪The maximum permissible speed is only permitted at maximum
clamping force.
▪ The power chuck only reaches the maximum specified clamping force
total when the maximum actuation force is applied.
▪ The clamping force must be checked regularly.
▪ Operation is only permitted with an effective safety guard.
The maximum torque which can be transmitted by the power chuck to the
workpiece depends on the technical design of the top jaws.
2.6.2 Skin Irritation due to Operating Materials
The lubricant consists of substances which may lead to skin irritations in the
event of frequent skin contact.
In order to minimise the risk of skin irritations, wear long work clothing and
avoid contact with the lubricant. Also observe the safety data sheet of the lub-
ricant and wear safety goggles and protective gloves during maintenance
work when handling lubricants.
2.6.3 Eye Injuries due to Metal Chips
Dangerous metal chips may be produced during machining of metal. During
operation or when cleaning the power chuck DURO-A RC, sharp metal chips
may be stirred up and cause eye injuries and cuts.
To prevent eye injuries and cuts, wear personal protective equipment during
operation and cleaning work. Cleaning with compressed air or a high-pressure
cleaner is not permitted.
2.6.4 Risk of Burns due to Hot Surfaces
The power chuck DURO-A RC may heat up during operation.
To prevent burns, do not touch the power chuck DURO-A RC after machining
and allow to cool down before carrying out assembly and maintenance work.
2.6.5 Dangers due to Imbalanced Workpieces
With rotating spindles, clamping of imbalanced workpieces generates a centri-
fugal force which affects smooth running of the power chuck DURO-A RC.
The power chuck DURO-A RC has a balance quality of G 6.3 as per
DIN ISO 21940. Additional risks may occur due to insufficient rotational bal-
ance. This applies in particular in the case of
▪ high speeds;
▪ when clamping asymmetrical workpieces;
▪ when using different top jaws or
▪ for all asymmetries of the power chuck DURO-A RC.

Safety | 2
DURO-A RC 15 / 48
Imbalanced workpieces endanger the personnel, the power chuck DURO-A
RC and the machine.
In order to compensate for unwanted imbalances and to prevent resulting
damage, the symmetrical mass distribution must be restored and the power
chuck DURO-A RC dynamically balanced with the workpiece.
2.6.6 Dangers due to Power Failure
An unexpected power failure during operation may lead to immediate failure
of the clamping force of the power chuck. The workpiece may then fly out and
cause serious crushing and impact injuries.
To prevent workpieces flying out, ensure perfect functioning of the power sup-
ply before each operation. In addition, the operator and the machine manufac-
turer must ensure by means of effective safety equipment that the actuating
and clamping forces are maintained without interruption until the machine
comes to a standstill and the workpiece remains tightly clamped.
2.6.7 Danger of Crushing
The machine manufacturer and / or operator must ensure that all danger to
persons due to unavoidable travel movements is excluded. For this purpose,
2-handed operation, for example, or preferably suitable safety guards can be
used.
If there is a gap of less than 25mm after the distance is travelled, there is
generally a risk of crushing extremities. For this reason,
▪ the speed of movement of components moving towards each other must
generally not be reduced to more than 2m/min (specification as per DIN
EN ISO 23125). This also applies to commissioning work, set-up mode
and service work.
▪ or in the case of clamping equipment with clamping movements where
workpiece loading in normal mode is carried out either mechanically or
with a ramrod.
▪ or the object to be clamped is fixed with a permanently or temporarily at-
tached workpiece holder (e.g. prism) before the movement is started.
▪ or, for example, in the case of cylinders and comparable moving compon-
ents, the gap is to be covered by a safety guard so as to be inaccessible.

2 | Safety
16 / 48 DURO-A RC
2.6.8 Procedure in the Event of Danger and Accidents
In the event of danger and accidents, it must be ensured that first aid meas-
ures can be taken immediately.
1. Shut the machine down immediately via the Emergency-Stop button.
2. Remove the person involved from the danger zone and sit or lay the per-
son down.
3. Call a doctor.
ØDo not make any changes to the accident site.
4. Administer first aid.
ØStop any bleeding.
ØCool burns.
5. Report all accidents to a superior.

Product Description | 3
DURO-A RC 17 / 48
3Product Description
3.1 About this Power Chuck
70
1
36
214
26
8
70 Safety key 8 Turning bolt
1 Basic body 2 Flange
36 Lubricating nipple 26 Chuck fixing screw
14 Base jaw

3 | Product Description
18 / 48 DURO-A RC
Cross-section
7
40
13
12
2
26
23
5
11
4
3
7 Pusher 40 Pressure spring
13 Stop disk 12 Threaded ring
2 Flange 26 Chuck fixing screw
23 Jaw fixing screw 5 Wedge bar
11 Jaw retaining pin 4 Piston
3 Protective bushing
The DURO-A RC is a power chuck with adjustable jaws (14), which is used to
clamp regularly and irregularly shaped workpieces.
It is only possible to assemble and disassemble the jaws (14) when the wedge
bar (5) is unlocked. The wedge bar (5) is locked and unlocked via the safety
key (70) included in the delivery. The jaws (14) are individually inserted and
can be locked and unlocked independently of each other.
The power chuck is attached to the machine spindle via a cylindrical holder on
the machine spindle. In the case of conical holders, an intermediate disk is re-
quired. The actuating force is generated via a clamping cylinder (electric, hy-
draulic or pneumatic).
The power chuck consists of a base body (1), piston (4), wedge bars (5),
driver, pusher (7), stop disk (13), flange (2), pressure spring (40), threaded
ring (12), bolt and conical lubricating nipple.
The piston is connected to the draw tube of the clamping cylinder via a
threaded ring (12). The piston is connected via an angled bar and a groove
with three wedge bars (5). Due to the axial movement of the piston, the
wedge bars (5) are moved and the attached jaws (14) carry out a radial
stroke.

Product Description | 3
DURO-A RC 19 / 48
3.2 Technical Specifications
3.2.1 Overview of Construction Sizes
ID no.: 183100 183101 183104 183106 183107
Size / outer Ø 180 180 215 215 260
Jaw stroke 6.8 6.8 7.4 7.4 8.2
Chuck height 83.9 83.9 95.9 113.9 108.5
Connection di-
mension
ZA 140 ZA 170 ZA 170 KK8 ZA 170
Piston stroke 20 20 25 25 28
Pass 53 53 66 66 81
Connection thread M60x1.5 M60x1.5 M75x1.5 M75x1.5 M90x1.5
Max. actuating
force
32 32 47 47 63
Max. total clamp-
ing force
64 64 100 100 135
Max. speed 6,300 6,300 6,000 6,000 4,700
Moment of inertia
[kg*m²]
0.056 0.056 0.14 0.15 0.32
Weight without
jaws
12.74 13.5 21.2 24 34.7
ID no.: 183108 183111 183112 183114 183115
Size / outer Ø 260 315 315 400 400
Jaw stroke 8.2 8.8 8.8 9.4 9.4
Chuck height 108.5 117.7 117.7 125.7 125.7
Connection di-
mension
ZA 220 ZA220 ZA 300 ZA 300 ZA 380
Piston stroke 28 28 28 30 30
Pass 81 104 104 128 128
Connection thread M90x1.5 M110x2 M110x2 M138x2 M138x2
Max. actuating
force
63 90 90 120 120
Max. total clamp-
ing force
135 180 180 240 240
Max. speed 4,700 4,000 4,000 3,500 3,500
Moment of inertia
[kg*m²]
0.33 0.8 0.84 2.3 2.4

3 | Product Description
20 / 48 DURO-A RC
Weight without
jaws
34.8 57.5 60 104 108
3.2.2 Environmental and Operational Conditions
The power chuck is designed for the following environmental and operating
conditions:
Ambient medium Air and non-aggressive gases
Place of use Interior
Vibration speeds < 5 mm/s as per DIN ISO 10816-3
Relative humidity (at +40 °C) < 100 %
Use in very humid conditions leads to
faster corrosion and may reduce the
useful life
Potentially explosive environments No
Ambient temperature at place of oper-
ation
+5 °C to +60 °C
Ambient temperature for storage +5 °C to +60 °C
Dry and wet machining Wet machining permitted with cooling
lubricants
Pollution of the environment caused by the machine itself is permitted. How-
ever, perfect operation of the power chuck must be ensured and checked reg-
ularly. With each jaw and tool change, the power chuck must be cleaned of
coarse dirt with a broom or brush. Cleaning with compressed air is not permit-
ted.