Optimum OPTIgrind GU15 User manual

GB
OPTIMUM
MASCHINEN - GERMANY
Operating manual
Version 1.0.2
Grinding machine
Item no. 310 1510
Item no. 310 1505
310 1520
Item no. 310 1515
Item no. 310 1525
Item no. 310 1550
Item no. 310 1570
310 1575
Item no. 310 1580
Item no. 310 1540
310 1545

OPTIMUM
MASCHINEN - GERMANY
Version 1.0.2 dated 2016-1-28Page 2 Original operating instructions
GU15 │GU18 │GU20 │GU20S │GU20P│GU25│GU25S│GU25PGB
Table of contents
1 Safety
1.1 Safety instructions (warning notes)...........................................................................................................4
1.1.1 Classification of hazards...........................................................................................................................4
1.1.2 Other pictograms ......................................................................................................................................5
1.2 Intended use .............................................................................................................................................5
1.3 Reasonably foreseeable misuse...............................................................................................................6
1.3.1 Avoiding misuse........................................................................................................................................6
1.4 Possible dangers caused by the grinding machine ..................................................................................6
1.5 Qualification of personnel .........................................................................................................................7
1.5.1 Target group .............................................................................................................................................7
1.6 Operator positions ....................................................................................................................................8
1.7 Safety measures during operation............................................................................................................8
1.8 Safety devices ..........................................................................................................................................8
1.8.1 Spark-guard and support surface .............................................................................................................8
1.9 Safety check .............................................................................................................................................9
1.10 Personal protective equipment .................................................................................................................9
1.11 For your own safety during operation .......................................................................................................9
1.12 Disconnecting and securing the grinding machine .................................................................................10
1.13 Emissions ...............................................................................................................................................10
1.14 Basic information on grinding wheels .....................................................................................................10
2 Technical data
3 Unpacking and Connecting
3.1 Scope of delivery ....................................................................................................................................11
3.2 Storage ...................................................................................................................................................11
3.3 Installation and assembly .......................................................................................................................12
3.3.1 Requirements regarding the installation site...........................................................................................12
3.4 First commissioning ................................................................................................................................12
3.5 Dimensions .............................................................................................................................................13
3.6 Overview GU20S | GU25S .....................................................................................................................16
3.7 First commissioning ................................................................................................................................17
3.7.1 Power supply ..........................................................................................................................................18
3.8 Operation ................................................................................................................................................18
4 Maintenance
4.1 Safety......................................................................................................................................................19
4.1.1 Preparation .............................................................................................................................................19
4.2 Inspection and maintenance...................................................................................................................19
4.3 Replacing a grinding wheel.....................................................................................................................20
4.4 Replacing a polishing wheel ...................................................................................................................20
4.5 Replacing the sanding belt .....................................................................................................................21
4.6 Repair .....................................................................................................................................................21
5 Appendix
5.1 Copyright ................................................................................................................................................22
5.2 Liability claims for defects / warranty ......................................................................................................22
5.3 Advice for disposal / options of reuse: ....................................................................................................23
5.3.1 Decommissioning ...................................................................................................................................23
5.3.2 Disposal of new device packaging..........................................................................................................23
5.3.3 Disposal of electrical and electronic components...................................................................................24
5.4 Disposal via municipal collection facilities ..............................................................................................24
5.5 Product follow-up ....................................................................................................................................24
5.6 Change information manual....................................................................................................................24

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6 Ersatzteile - Spare parts
6.1 Ersatzteilzeichnung - Spare parts drawing ............................................................................................. 25
7 Ersatzteile - Spare parts - SL-1 | SL-2
7.1 Ersatzteilzeichnung - Spare parts drawing ............................................................................................. 27
7.1.1 Ersatzteilliste - Spare parts list SL-1 ...................................................................................................... 28
7.1.2 Ersatzteilliste - Spare parts list SL-2 ...................................................................................................... 29
8 Ersatzteile - Spare parts
8.1 Ersatzteilzeichnung - Spare parts drawing ............................................................................................. 30
Preface
Dear customer,
Thank you very much for purchasing a product made by OPTIMUM.
OPTIMUM metal working machines offer a maximum of quality, technically optimum solutions and convince
by an outstanding price performance ratio. Continuous enhancements and product innovations guarantee
state-of-the-art products and safety at any time.
Before commissioning the machine please thoroughly read these operating instructions and get familiar with
the machine. Please also make sure that all persons operating the machine have read and understood the
operating instructions beforehand.
Keep these operating instructions in a safe place nearby the machine.
Information
The operating instructions include indications for safety-relevant and proper installation, operation and main-
tenance of the machine. The continuous observance of all notes included in this manual guarantee the safety
of persons and of the machine.
The manual determines the intended use of the machine and includes all necessary information for its eco-
nomic operation as well as its long service life.
In the paragraph "Maintenance" all maintenance works and functional tests are described which the operator
must perform in regular intervals.
The illustration and information included in the present manual can possibly deviate from the current state of
construction of your machine. Being the manufacturer we are continuously seeking for improvements and
renewal of the products. Therefore, changes might be performed without prior notice. The illustrations of the
machine may be different from the illustrations in these instructions with regard to a few details. However,
this does not have any influence on the operability of the machine.
Therefore, no claims may be derived from the indications and descriptions. Changes and errors are reserved!
Your suggestion with regard to these operating instructions are an important contribution to optimising our
work which we offer to our customers. For any questions or suggestions for improvement, please do not hesi-
tate to contact our service department.
If you have any further questions after reading these operating instructions and you are not able to
solve your problem with a help of these operating instructions, please contact your specialised
dealer or directly the company OPTIMUM.
Optimum Maschinen Germany GmbH
Dr.- Robert - Pfleger - Str. 26
D-96103 Hallstadt
Mail: [e-mail]
Internet: www.optimum-maschinen.com

OPTIMUM
MASCHINEN - GERMANY
Safety
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1 Safety
Glossary of symbols
This part of the operating instructions
explains the meaning and use of the warning notes included in these operating instructions,
defines the intended use of the grinding machine,
points out the dangers that might arise for you or others if these instructions are not
observed,
informs you about how to avoid dangers.
In addition to these operation instructions, please observe
the applicable laws and regulations,
the statutory provisions for accident prevention,
the prohibition, warning and mandatory signs as well as the warning notes on the grinding
machine.
Always keep this documentation close to the grinding machine.
1.1 Safety instructions (warning notes)
1.1.1 Classification of hazards
We classify the safety warnings into different categories. The table below gives an overview of
the classification of symbols (ideogram) and the warning signs for each specific danger and its
(possible) consequences.
provides further instructions
calls on you to act
enumerations
Symbol Warning alert Definition / consequence
DANGER! Impending danger that will cause serious injury or death to people.
WARNING! A danger that can cause serious injury or death.
CAUTION!
A danger or unsafe procedure that can cause personal injury or dam-
age to property.
ATTENTION!
Situation that could cause damage to the grinding machine and product
and other types of damage.
No risk of injury to people.
INFORMATION
Application tips and other important or useful information and notes.
No dangerous or harmful consequences for people or objects.

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MASCHINEN - GERMANY
Safety
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1.1.2 Other pictograms
1.2 Intended use
WARNING!
In the event of improper use, the grinding machine
will endanger personnel,
will endanger the grinding machine and other material property of the operator,
the correct function of the grinding machine may be affected.
The machine is designed and manufactured exclusively for grinding and polishing metals using
properly authorised grinding wheels, sanding belts or polishing wheels.
The grinding machine must be used exclusively for this purpose.
If the grinding machine is used in any way other than described above, modified without author-
ization of Optimum Maschinen Germany GmbH, then the grinding machine is being used
improperly.
We will not be held liable for any damages resulting from any operation which is not in accord-
ance with the intended use.
We expressly point out that any constructive technical or procedural changes which had not
been performed by the company Optimum Maschinen Germany GmbH will render the guaran-
tee or CE conformity null and void. It is also part of intended use that
the limits of performance of the grinding machine are observed,
the operating manual is observed,
the inspection and maintenance instructions are observed.
Activation forbidden! Warning of flammable
substances!
Warning: suspended loads! Warning: risk of stumbling!
Warning: tilting danger! Warning: automatic start-
up!
Warning of biological
hazard!
Warning of injuries to
hands!
Read the operating instruc-
tion!
Pull the mains plug! Wear protective glasses! Use face shield!
Wear safety shoes! Wear a protective suit! Use ear protection! Protect the environment!

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Safety
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WARNING!
Severe injuries due to non-intended use.
It is forbidden to make any modifications or alterations to the operation values of the
grinding machine. They could endanger the personnel and cause damage to the grinding
machine.
ATTENTION!
If the grinding machine is not used as intended or if the safety directives or the operating
instructions are ignored, the liability of the manufacturer for any damages to persons or
objects resulting hereof is excluded and any claims under guarantee are rendered null
and void!
1.3 Reasonably foreseeable misuse
Any other use other than that specified under "Intended use" or any use beyond the described
use shall be deemed as non-intended use and is not permissible.
Any other use has to be discussed with the manufacturer.
In order to avoid misuse, it is necessary to read and understand the operating instructions
before first commissioning.
Operators must be qualified.
1.3.1 Avoiding misuse
The distance from the supporting surface to the grinding wheel may not be less than 2 mm.
However, the distance may be greater if the grinding process and the material used require
this for security reasons.
We expressly point out that if any constructive, technical or procedural changes are not per-
formed by the company Optimum Maschinen Germany GmbH, the guarantee or CE conformity
will be rendered null and void.
WARNING!
Risk of injury caused by flying workpieces
Ensure the gap between the grinding wheel and bearing surface is as small as possible and
readjust the support surface immediately if the distance is too big.
If the support surface can no longer be adjusted, the grinding wheel must be replaced.
1.4 Possible dangers caused by the grinding machine
The grinding machine is state-of-the-art. Nevertheless, there is a residual risk as the grinding
machine operates
at high speeds,
with rotating parts,
with grinding wheels (emission of sparks),
with electrical voltage and currents.
We have used construction resources and safety techniques to minimize the health risk to per-
sonnel resulting from these hazards.
If the grinding machine is used and maintained by personnel who are not duly qualified, there
may be a risk resulting from incorrect or unsuitable maintenance of the grinding machine.
INFORMATION
Everyone involved in the assembly, commissioning, operation and maintenance must
be duly qualified,
and strictly follow these operating instructions.

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Safety
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Always disconnect the grinding machine from the electrical power supply when performing
cleaning or maintenance works.
WARNING!
The grinding machine may only be used with functional safety devices.
Disconnect the grinding machine immediately whenever you detect a failure in the safety
devices or when they are not mounted!
All additional devices installed by the operator must be equipped with the prescribed
safety devices.
This is your responsibility as the operating company!
 "Safety devices“ on page 8
1.5 Qualification of personnel
1.5.1 Target group
This manual is addressed to
the operating companies,
the operators,
the maintenance personnel.
Therefore, the warning notes refer to both operation and maintenance of the grinding machine.
Always disconnect the grinding machine from the mains. This will prevent it from being used by
unauthorized persons.
The qualifications of the personnel for the different tasks are mentioned below:
Operator
The operator is instructed by the operating company about the assigned tasks and possible
risks in case of improper behaviour. Any tasks which need to be performed beyond operation in
standard mode must only be performed by the operator, if so indicated in these instructions and
if the operator has been expressively commissioned by the operating company.
Qualified electrician
With professional training, knowledge and experience as well as knowledge of respective
standards and regulations, qualified electricians are able to perform work on the electrical sys-
tem and recognise and avoid any possible dangers.
Qualified electricians have been specially trained for the working environment, in which they are
working and know the relevant standards and regulations.
Qualified personnel
Thanks to professional training, knowledge and experience as well as knowledge of relevant
regulations the qualified personnel is able to perform the assigned tasks and to independently
recognise and avoid any possible dangers themselves.
Instructed person
Instructed persons were instructed by the operating company regarding the assigned tasks and
any possible risks of improper behaviour.
INFORMATION
Everyone involved in the assembly, commissioning, operation and maintenance must
be duly qualified,
and strictly follow these operating instructions.
In the event of improper use

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Safety
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there may be a risk to personnel,
there may be a risk to the grinding machine and other material values,
the correct function of the grinding machine may be affected.
1.6 Operator positions
The operator’s position is in front of the grinding machine.
1.7 Safety measures during operation
CAUTION!
Danger due to inhaling dust and mist that is hazardous to health.
Dependent on the material to be processed and the additional resources used, the
generated dust and mist may be hazardous to your health.
Make sure that any harmful dusts or mist is safely sucked off at the point of origin and
dissipated or filtered from the working area.
1.8 Safety devices
Use the grinding machine only with properly functioning safety devices.
Stop the grinding machine immediately in case of failure of a safety device or if it is not function-
ing for any reason.
This is your responsibility!
If a safety device has been activated or has failed, the grinding machine must only be used if
the cause of the fault has been eliminated,
you have verified that there is no danger to personnel or objects.
WARNING!
If you bypass, remove or deactivate a safety device in any other way, you are
endangering yourself and other personnel working with the grinding machine. The
possible consequences are:
injuries may occur due to workpiece or parts of workpieces flying off,
contact with rotating parts,
fatal electrocution.
The grinding machine includes the following safety devices:
A spark protection on each grinding wheel.
A protective guard with shaft cover on each grinding wheel.
A support surface for the workpiece.
WARNING!
The separating protective equipment, which is made available and delivered together
with the machine, is designed to reduce the risk of workpieces or fractions of them
being expelled, but not to prevent this completely. Always work carefully and observe
the limit values of the grinding process.
1.8.1 Spark-guard and support surface
Adjust the protective equipment to the correct height before you start working. To do so, detach
the clamping screw, adjust the required height and re-tighten the clamping screw. Observe the
correct distance to the grinding wheel.

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Safety
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1.9 Safety check
Check the grinding machine regularly.
Check all safety devices.
Before each operation,
once a week (with the machine in operation),
after every maintenance and repair work.
1.10 Personal protective equipment
For certain work, personal protective equipment is required.
Protect your face and your eyes: Wear a safety helmet with facial protection when performing
work where your face and eyes are exposed to hazards.
Wear protective gloves when handling pieces with sharp edges.
Use safety shoes when you assemble, disassemble or transport heavy components, or transport
the grinding machine.
Use ear protection if the noise level (emission) in the workplace exceeds 80 dB (A).
Before starting work, make sure that the required personal protective equipment is available
at the workplace.
CAUTION!
Dirty or contaminated personnel protective equipment can cause illness. It must be
cleaned after each use and at least once a week.
1.11 For your own safety during operation
WARNING!
Before activating the grinding machine ensure that doing so will neither endanger other
persons nor cause damage to equipment.
Avoid any unsafe work methods:
The instructions mentioned in these operating instructions have to be strictly observed during
assembly, operation, maintenance and repair.
Use protective glasses!
Do not work on the grinding machine, if your concentration is reduced, for example,
because you are taking medication.
Stay with the grinding machine, until the grinding machine has come to a complete stand-
still.
Use the prescribed personal protective equipment. You must wear a well-fitting work suit
and, if necessary, a hairnet.
Make sure that your work does not pose a safety risk to others.

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1.12 Disconnecting and securing the grinding machine
Unplug the mains switch before starting any maintenance or repair work.
1.13 Emissions
The noise emitted by the grinding machine is less than 80 dB(A). If the grinding machine is
installed in an area, where various machines are in operation, the noise exposure (immission)
on the operator of the drilling machine at the working place may exceed 80 dB(A).
INFORMATION
This numerical value was measured on a new machine under the operating conditions specified
by the manufacturer. The noise behaviour of the machine might change depending on its age
and wear.
Furthermore, the noise emission also depends on production engineering factors, e.g. speed,
material and clamping conditions.
INFORMATION
The specified numerical value represents the emission level and does not necessarily consti-
tute a safe working level. Although there is a dependency between the degree of the noise
emission and the degree of the noise disturbance, it is not possible to use it reliably to deter-
mine, if further precaution measures are required or not. The following factors influence the
actual degree of noise exposure for the operator:
Characteristics of the working area, e.g. size or damping behaviour,
other noise sources, e.g. the number of machines,
other processes taking place in proximity and the period of time, during which the operator
is exposed to the noise.
Furthermore,the admissible exposure level might differ from country to country due to national
regulations. This noise emission information should, however, allow the machine operator to
more easily evaluate the hazards and risks.
CAUTION!
Depending on the overall noise exposure and basic threshold values, machine operators
must wear appropriate hearing protection. We generally recommend the use of noise
protection and hearing protection.
1.14 Basic information on grinding wheels
Various shortcomings during installation and operation can lead to the bursting of grinding
wheels.
Ordinary grinding wheels are generally not designed to withstand a greater lateral load.
The tapping off cutting debris from the grinding wheel always leads to damage of the grind-
ing wheel.
Grinding wheels which have an imbalance can burst more easily.
An unbalance of a grinding wheel cannot be completely removed by trueing with a diamond
dresser.
Incorrectly stored grinding wheels can burst immediately after switching on, or individual
small fragments can fly away like a bullet.

OPTIMUM
MASCHINEN - GERMANY
Technical data
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2 Technical data
3 Unpacking and Connecting
The grinding machine is delivered pre-assembled.
3.1 Scope of delivery
When the grinding machine is delivered, please check immediately that it has not been dam-
aged during transport. Also check that no fastening screws have come loose. Compare the
delivery volume with the information on the delivery note. Grinding wheels and polishing wheels
are available in specialist shops or from our main catalogue.
3.2 Storage
ATTENTION!
Incorrect and improper storage might result in damage or destruction of electrical and
mechanical machine components.
Store packed and unpacked parts only under the intended environmental conditions.
Follow the instructions and information on the transport box.
Consult Optimum Maschinen Germany GmbH if the machine and accessories are stored for
more than three months or under different environmental conditions than those given here.
GU15 GU18 GU20 GU20S GU20P GU25 GU25S GU25P
Electrical connection 230V ~50HZ 230V ~50HZ
3x 400V ~50HZ
3x 400V ~50HZ
Motor power 450W 600W 1.5 KW
Speed [ min-1 ] 2850
Grinding wheel [mm] Ø 150 x 20 Ø 175 x 25 Ø 200 x 30 - Ø 250 x 40 -
Polishing wheel
[mm]
- - - - Ø 200 x 20 - Ø 250 x 25
Grinding speed,
polishing speed [m/s]
22 26 30 - 30 37 - 37
Belt grinding speed
[m/s]
---16--16-
Sanding belt length /
width [mm]
- - - 762 x 75 - - 1016 x 75 -
Weight of the
machine [kg]
10.7 12.3 18.5 20.7 10.6 32.5 31.5 17.4
Shaft diameter
Grinding wheel [mm]
Ø16 Ø32 Ø32 Ø32 - Ø32 Ø32 -
Shaft diameter
Polishing wheel
[mm]
----Ø16--Ø20

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3.3 Installation and assembly
3.3.1 Requirements regarding the installation site
Organize the working area around the grinding machine according to the local safety regula-
tions.
WARNING!
The grinding machine must be connected to the substructure.
INFORMATION
In order to attain good functionality and a high processing accuracy as well as a long service life
of the machine, the place of installation should fulfil certain criteria.
Please observe the following points:
The device must only be installed and operated in a dry and well-ventilated place.
Avoid locations near machines generating chips or dust.
The installation site must be free from vibrations also at a distance from presses, planing
machines, etc.
The substructure must be suitable for the grinding machine. Also make sure that the floor
has sufficient load bearing capacity and is level.
The ground must be prepared in such a way that potential coolants cannot penetrate the
floor.
Any parts sticking out such as stops, handles, etc. have to be secured by measures taken
by the customer if necessary in order to avoid endangering persons.
Provide sufficient space for the personnel preparing and operating the machine and trans-
porting the material.
Also make sure the machine is accessible for setting and maintenance works.
Provide for sufficient backlight (Minimum value: 500 lux, measured at the tool tip). At lower
illumination intensities, additional illumination must be provided, e.g. by means of a sepa-
rate workplace lamp.
The mains plug of the grinding machine must be readily accessible.
CAUTION!
Arrange the machine's connection cable in such a way that it will not cause a tripping
hazard.
3.4 First commissioning
For first commissioning, the grinding wheels must be trued with a dressing stone to ensure the
true running of the grinding wheels.
Grinding wheels made from compound abrasives have a natural imbalance as a result of the
pressing process during the manufacturing process. Compound grinding wheels have a higher
or lower density in some areas. This natural imbalance cannot be removed with a dressing
stone, however, the imbalance of the machine can be reduced by turning the grinding wheel,
e.g. by 180° on the grinding wheel shaft.

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3.5 Dimensions
Img.3-1: GU15 │GU18│GU20│GU25
B
C
G
J
D
E
P F
A
H
[mm] GU15 GU18 GU20 GU25
A 394 394 455 473
B 374 374 425 450
C 135 135 160 240
GB 113 113 138 201
E 141 141 148 148
F6669
G 229.5 243.5 281.5 319
H 163 163 170 212
J 135 135 160 170

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Img.3-2: GU20S │GU25S
A
G
K
PF
D
E
H
C
L
[mm] GU20S GU25S
A 499 601
C 160 240
GB 138 201
E 148 148
F69
G 463 593
H 170 212
L 300 421

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Img.3-3: GU20P │GU25P
A
PM
P
D
E
G
C H
PF
[mm] GU20P GU25P
A 540 591
C 160 240
GB 138 201
E 148 148
F69
G 262 297
H 170 212
M 200 250
P2025

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3.6 Overview GU20S | GU25S
Turn a band reel by hand and pay attention to the run of the sanding belt. If the sanding belt
runs off to the left or right, the belt run (6) needs to be adjusted. If the sanding belt is too loose,
it must be tightened (7+10).
7 Knurled screw for clamping the sanding belt
8 Knurled nut for adjusting the belt tracking
9 Material stop
10 Shaft nut
11 Connecting piece for suction mechanism
11
9
7
8
10
loosen
tighten
6
10
7

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Check the run direction (400V machine).
It is possible to adjust the grinding attachment by means of the flange in a slewing range from
0° to 90°.
To do so, loosen the two fixing screws (6) on the flange.
Adjust the required working position.
Firmly retighten the fixing screws when the setting is completed.
3.7 First commissioning
ATTENTION!
Before operating the machine, check all screws, fixtures and/or safety devices and
tighten the screws if necessary!
WARNING!
The use of unsuitable grinding wheels, sanding belts and polishing wheels constitute a
safety hazard. Use only grinding wheels, sanding belts and polishing wheels that
withstand the speed requirements and possible loads.
Payattentiontothe
directionofrotation!
6

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WARNING!
There is a danger to people, the machine and the equipment, if the first commissioning
of the grinding machine is carried out by inexperienced personnel.
We do not accept any liability for damages caused by incorrectly performed commissioning.
 "Qualification of personnel“ on page 7
3.7.1 Power supply
Connect the electrical supply cable.
Check the fusing (fuse) of your electrical supply.
3.8 Operation
Before you start grinding, check that the workpiece is free of oil, grease and paint residues
to prevent smudging or soiling of the grinding wheels.
Check the condition of the grinding wheels. If the grinding wheels are dirty or muddied, they
must be roughened or replaced.
If necessary, grind the workpiece with the coarse grinding wheel first, before using the fine
grinding wheel.
The workpiece support can be adjusted for certain grinding operations. Loosen the clamping
screw to adjust the workpiece support.
Note that this adjustment results in a reduced potential load absorption of the workpiece
support.
The distance between the grinding wheel and workpiece support must be as low as possi-
ble.
Only put slight pressure on the workpiece.
Check the state of the grinding wheel. If it is dirty, it must be scraped clean or replaced.
Grinding wheels must be disposed of in an environmentally friendly manner.

OPTIMUM
MASCHINEN - GERMANY
Maintenance
Version 1.0.2 vom 2016-1-28 Page 19Original operating instructions
GU15 │GU18 │GU20 │GU20S │GU20P│GU25│GU25S│GU25P GB
4 Maintenance
In this chapter you will find important information about
Inspection
Maintenance
Repair
of the grinding machine.
ATTENTION!
Properly performed regular maintenance is an essential prerequisite for
operational safety,
failure-free operation,
long durability of the grinding machine and
the quality of your manufactured products.
Installations and equipment from other manufacturers must also be in good order and condition.
4.1 Safety
WARNING!
Consequences of incorrect maintenance and repair work may include:
Very serious injury to personnel working on the grinding machine,
damage to the grinding machine.
Maintenance and repair work on the grinding machine should only be carried out by
qualified personnel.
4.1.1 Preparation
WARNING!
Only carry out work on the grinding machine, if it has been disconnected from the power
supply.
4.2 Inspection and maintenance
INFORMATION
The bearing is lifetime-lubricated. It is not necessary to lubricate it again.
WARNING!
Grinding wheels must be replaced, if there is an excessive distance between the external
diameter of the grinding wheel and the completely readjusted workpiece support.

OPTIMUM
MASCHINEN - GERMANY
Maintenance
Version 1.0.2 vom 2016-1-28Page 20 Original operating instructions
GU15 │GU18 │GU20 │GU20S │GU20P│GU25│GU25S│GU25PGB
4.3 Replacing a grinding wheel
Disassemble the protective cover of the grinding wheel.
Loosen the shaft nut.
Hold the grinding wheel tight to loosen the nut. Make sure you use the correct direction to
loosen the nut.
Pull off the grinding wheel and the retaining washer from the shaft by hand.
Check the new grinding wheel for visible damage prior to assembly.
4.4 Replacing a polishing wheel
WARNING!
Use only cap nuts for fixing the polishing wheels. The shaft ends must be covered.
Disconnect the device from the mains.
Secure the polishing machine against unauthorized switching on.
Unscrew the cap nut on the left polishing wheel, (right-hand thread).
Unscrew the cap nut on the right polishing wheel, (left-hand thread).
The bolted connection can easily be loosened by light taps on the key which is being used
to unscrew the cap nut. For safety reasons, there is no counter-support for loosening the
cap nuts.
Pull the polishing wheel off the driving shaft.
Mount the new polishing wheels. Make sure that the clamping wheels are in the right posi-
tion.
Check the orientation in the centric run by manually turning the polishing wheels.
Fasten the cap nut using an open-jaw spanner.
Carry out a trial run.
Shaft nut Retaining washer
Thrust washer
Drive shaft