Optimum OPTidrill DH 28GSV User manual

GB
OPTIMUM
MASCHINEN - GERMANY
Operating Manual
Version 1.2.5
Geared drill
Part no. 303 4225
Part no. 303 4235
Part no. 303 4245

OPTIMUM
MASCHINEN - GERMANY
Version 1.2.5 dated 10. März 2017Page 2 Original operating instructions
L500 | L520GB
Table of contents
1 Safety
1.1 Type plates ...............................................................................................................................................7
1.2 Safety instructions (warning notes)...........................................................................................................8
1.2.1 Classification of hazards ...............................................................................................................8
1.2.2 Other pictograms...........................................................................................................................9
1.3 Intended use ...........................................................................................................................................10
1.4 Reasonably foreseeable misuse.............................................................................................................10
1.4.1 Avoiding misuse ..........................................................................................................................10
1.5 Possible dangers caused by the geared drill ..........................................................................................11
1.6 Qualification of personnel .......................................................................................................................12
1.6.1 Target group................................................................................................................................12
1.6.2 Authorized persons .....................................................................................................................13
1.7 Operator positions ..................................................................................................................................14
1.8 Safety measures during operation..........................................................................................................14
1.9 Safety devices ........................................................................................................................................14
1.10 Safety check ...........................................................................................................................................15
1.11 EMERGENCY STOP push button ..........................................................................................................16
1.11.1 Main switch..................................................................................................................................16
1.11.2 Drill chuck guard..........................................................................................................................16
1.12 Personal protective equipment ...............................................................................................................17
1.13 Safety during operation...........................................................................................................................18
1.14 Safety during maintenance .....................................................................................................................18
1.14.1 Disconnecting and securing the geared drill ...............................................................................18
1.15 Using lifting equipment ...........................................................................................................................18
1.15.1 Mechanical maintenance.............................................................................................................19
1.16 Accident report........................................................................................................................................19
1.17 Electronics ..............................................................................................................................................19
1.18 Inspection deadlines ...............................................................................................................................19
2 Technical specification
2.1 Emissions ...............................................................................................................................................21
2.2 Dimensions DH26GTV ...........................................................................................................................23
2.3 Dimensions DH28GSV ...........................................................................................................................24
2.4 Dimensions DH32GSV ...........................................................................................................................25
3 Assembly
3.1 Scope of delivery ....................................................................................................................................26
3.2 Transport ................................................................................................................................................26
3.3 Set-up and assembly ..............................................................................................................................26
3.3.1 Installation site requirements.......................................................................................................26
3.3.2 Assembly.....................................................................................................................................27
3.4 Installation...............................................................................................................................................27
3.5 Fixing ......................................................................................................................................................27
3.5.1 Assembly drawing DH26GTV......................................................................................................29
3.5.2 Assembly drawing DH28GSV .....................................................................................................29
3.5.3 Installation diagram DH32GSV ...................................................................................................30
3.6 First commissioning ................................................................................................................................30
3.6.1 Connecting the optional foot switch.............................................................................................31
3.6.2 Warming up the machine ............................................................................................................31
3.7 Electrical connection...............................................................................................................................31
3.7.1 Regulated drives in connection with residual current devices .....................................................32
3.7.2 Protection from Dangerous Shock Currents, use of ELCBs........................................................32
3.7.3 Current in the protective earth conductor - Leakage current.......................................................32
3.7.4 When the ELCB triggers..............................................................................................................33

OPTIMUM
MASCHINEN - GERMANY
Version 1.2.5 dated 10. März 2017 Page 3Original operating instructions
L500 | L520 GB
4Operation
4.1 Safety ..................................................................................................................................................... 34
4.2 Before starting work ............................................................................................................................... 34
4.3 During work ............................................................................................................................................ 35
4.4 Cooling ................................................................................................................................................... 35
4.5 Control and indicating elements DH26GTV | DH28GSV........................................................................ 36
4.6 Control panel DH26GTV and DH28GSV................................................................................................ 37
4.6.1 Drill depth stop ............................................................................................................................ 38
4.7 Switching the machine on ...................................................................................................................... 38
4.8 Switching off the machine ...................................................................................................................... 38
4.8.1 Gear selector switch - DH26GTV ǀDH28GSV ............................................................................ 39
4.8.2 Speed table - DH26GTV | DH28GSV ......................................................................................... 39
4.9 Disassembly, assembly of drill chucks and drill bits
DH26GTV ǀDH28GSV40
4.9.1 Use of the quick-action drill chuck............................................................................................... 40
4.9.2 Disassembly with drill drift........................................................................................................... 40
4.9.3 Disassembly with integrated drill drift.......................................................................................... 41
4.9.4 Fitting the drill chuck ................................................................................................................... 42
4.10 Foot switch - Rotation reversal............................................................................................................... 42
4.11 Control and indicating elements DH32GSV ........................................................................................... 43
4.12 Control panel DH 32 GSV ...................................................................................................................... 44
4.12.1 Drill depth stop - DH 32 GSV ...................................................................................................... 45
4.13 Switching on the machine - DH 32 GSV ................................................................................................ 46
4.14 Switching off the machine - DH 32 GSV ................................................................................................ 46
4.14.1 Gear selector switch - DH 32 GSV.............................................................................................. 46
4.14.2 Speed table - DH 32 GSV........................................................................................................... 47
4.15 Spindle sleeve feed ................................................................................................................................ 47
4.15.1 Manual spindle sleeve feed......................................................................................................... 47
4.15.2 Automatic spindle sleeve feed .................................................................................................... 47
4.16 Disassembly, assembly of drill chucks and drill bits............................................................................... 48
4.16.1 Use of the quick-action drill chuck............................................................................................... 48
4.16.2 Disassembly with integrated drill drift.......................................................................................... 48
4.16.3 Fitting the drill chuck ................................................................................................................... 50
4.17 Coolant equipment ................................................................................................................................. 50
4.18 Footswitch - Rotation reversal................................................................................................................ 51
5 Determining the cutting speed and the speed
5.1 Table cutting speeds / infeed ................................................................................................................. 52
5.2 Speed table ............................................................................................................................................ 52
5.3 Examples to calculatory determine the required speed for your drilling machine .................................. 54
6 Maintenance
6.1 Safety ..................................................................................................................................................... 55
6.1.1 Preparation.................................................................................................................................. 55
6.1.2 Restarting.................................................................................................................................... 55
6.2 Inspection and maintenance .................................................................................................................. 56
6.3 Repair..................................................................................................................................................... 61
6.3.1 Customer service technician ....................................................................................................... 61
6.4 Cooling lubricants and tanks .................................................................................................................. 62
6.4.1 Inspection plan for water-mixed cooling lubricants ..................................................................... 63
7 Ersatzteile - Spare parts - DH26GTV | DH28GSV
7.1 Elektrische Ersatzteile - Electrical spare parts ....................................................................................... 64
7.2 Schaltplan - Wiring diagram ................................................................................................................... 64
7.3 Bohrkopf- Drilling head........................................................................................................................... 64
7.4 Bohrkopf - Drilling head.......................................................................................................................... 65
7.5 Bohrkopf - Drilling head.......................................................................................................................... 66

OPTIMUM
MASCHINEN - GERMANY
Version 1.2.5 dated 10. März 2017Page 4 Original operating instructions
L500 | L520GB
7.6 Bohrkopf - Drilling head ..........................................................................................................................67
7.7 Bohrkopf - Drilling head ..........................................................................................................................67
7.8 Bohrkopf - Drilling head ..........................................................................................................................68
7.9 Bohrkopf - Drilling head - DH26GTV | DH28GSV, Version 1.0 ..............................................................68
7.10 Bohrkopf - Drilling head - DH26GTV | DH28GSV, Version 1.1 ..............................................................69
7.11 Bohrfutterschutz - Drilling chuck protection ............................................................................................70
7.12 Bohrtisch - Drilling table - DH26GTV ......................................................................................................73
7.13 Bohrtisch - Drilling table - DH28GSV......................................................................................................74
7.14 Schaltplan - Wiring diagram - DH26GTV, Version 1.0............................................................................76
7.15 Schaltplan - Wiring diagram - DH28GSV, Version 1.0 ...........................................................................77
7.16 Schaltplan - Wiring diagram - DH26GTV - 1-3, Version 1.1 ...................................................................79
7.17 Schaltplan - Wiring diagram - DH26GTV - 2-3, Version 1.1 ...................................................................80
7.18 Schaltplan - Wiring diagram - DH26GTV - 3-3, Version 1.1 ...................................................................81
7.19 Schaltplan - Wiring diagram - DH28GSV - 1-3, Version 1.1 ...................................................................82
7.20 Schaltplan - Wiring diagram - DH28GSV - 2-3, Version 1.1 ...................................................................83
7.21 Schaltplan - Wiring diagram - DH28GSV - 1-3, Version 1.1 ...................................................................84
7.22 Zusätzliche Beschreibungen und Anleitungen - Additional descriptions and manuals...........................85
7.22.1 Frequenzumrichter - Frequency converter ..................................................................................85
8 Ersatzteile - Spare parts - DH32GSV
8.1 Bohrkopf- Drilling head ...........................................................................................................................86
8.2 Bohrkopf - Drilling head ..........................................................................................................................87
8.3 Bohrkopf - Drilling head ..........................................................................................................................88
8.4 Bohrkopf - Drilling head ..........................................................................................................................89
8.5 Bohrkopf - Drilling head ..........................................................................................................................90
8.6 Bohrkopf - Drilling head, Version 1.0 ......................................................................................................91
8.7 Bohrkopf - Drilling head, Version 1.1 ......................................................................................................92
8.8 Bohrkopf - Drilling head - DH32GSV, Version 1.0 ..................................................................................93
8.9 Bohrkopf - Drilling head - DH32GSV, Version 1.1 ..................................................................................94
8.10 Bohrkopf - Drilling head - DH32GSV ......................................................................................................95
8.11 Bohrtisch - Drilling table..........................................................................................................................98
8.12 Bohrfutterschutz - Drilling chuck protection ..........................................................................................100
8.13 Schaltplan - Wiring diagram - DH 32 GSV - 1-2, Version 1.0 ...............................................................101
8.14 Schaltplan - Wiring diagram - DH 32 GSV - 2-2, Version 1.0 ...............................................................102
8.15 Schaltplan - Wiring diagram - DH 32 GSV - 1-3, Version 1.1 ...............................................................104
8.16 Schaltplan - Wiring diagram - DH 32 GSV - 2-3, Version 1.1 ...............................................................105
8.17 Schaltplan - Wiring diagram - DH 32 GSV - 3 of 3, Version 1.1 ...........................................................106
8.18 Zusätzliche Beschreibungen und Anleitungen - Additional descriptions and manuals.........................107
8.18.1 DH32GSV - Frequenzumrichter - Frequency converter ............................................................107
9 Malfunctions
10 Appendix
10.1 Copyright ..............................................................................................................................................110
10.2 Terminology/Glossary...........................................................................................................................110
10.3 Liability claims/warranty........................................................................................................................110
10.3.1 Change information operating manual ......................................................................................111
10.4 Storage .................................................................................................................................................112
10.5 Advice for disposal / Options of reuse: .................................................................................................112
10.5.1 Decommissioning ......................................................................................................................113
10.5.2 Disposal of new device packaging ............................................................................................113
10.5.3 Disposal of the old device .........................................................................................................113
10.5.4 Disposal of electrical and electronic components .....................................................................113
10.5.5 Disposal of lubricants and coolants...........................................................................................114
10.6 Disposal via municipal collection facilities ............................................................................................114
10.7 RoHS, 2011/65/EU ...............................................................................................................................114

OPTIMUM
MASCHINEN - GERMANY
Version 1.2.5 dated 10. März 2017 Page 5Original operating instructions
L500 | L520 GB
10.8 Product follow-up.................................................................................................................................. 114
10.9 EC Declaration of Conformity DH26GTV | DH28GSV | DH32GSV...................................................... 115

OPTIMUM
MASCHINEN - GERMANY
Version 1.2.5 dated 2017-03-10Page 6 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
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
Version 1.2.5 dated 2017-03-10 Page 7Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
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 geared drill,
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 geared
drill.
Always keep this documentation close to the geared drill.
1.1 Type plates
provides further instructions
calls on you to act
listings
Optimum Maschinen
Germany GmbH
Dr.-Robert-Pfleger-Str. 26
D-96103 Hallstadt
3034225
158 kg
1,5 kW
230 V ~50 Hz
DH 26GTV
3200 U/min
20
NO.
SN
Year
J
DE
GB
FR
ES
IT
CZ
DK
FI
GR
HU
NL
PL
PT
RU
SE
SL
TR
Getriebebohrmaschine
Perceuse
Taladro
Søjleboremaskine
Επιδαπεδειο Δραπανο
Wiertarki
Máquina de perfuração
Bormașină
Pelarborrmaskin
Steberni vrtalni stroj
Sütunlu matkap
Gear upright drill
de engranaje
Alesatrice ad ingranaggi
Převodová vrtačka
Hammasvaihteellinen porakone
Hajtómûves fúrógép
Tandwiel aangedreven boormachine
med gearkasse
optimum-maschinen.de
Optimum Maschinen
Germany GmbH
Dr.-Robert-Pfleger-Str. 26
D-96103 Hallstadt
3034235
184 kg
1,5 kW
400 V ~50 Hz
DH 28GSV
3200 U/min
20
NO.
SN
Year
J
111 60
DE
GB
FR
ES
IT
CZ
DK
FI
GR
HU
NL
PL
PT
RU
SE
SL
TR
Getriebebohrmaschine
Perceuse
Taladro
Søjleboremaskine
Επιδαπεδειο Δραπανο
Wiertarki
Máquina de perfuração
Bormașină
Pelarborrmaskin
Steberni vrtalni stroj
Sütunlu matkap
Gear upright drill
de engranaje
Alesatrice ad ingranaggi
Převodová vrtačka
Hammasvaihteellinen porakone
Hajtómûves fúrógép
Tandwiel aangedreven boormachine
med gearkasse
optimum-maschinen.de
Master Labels
Optimum Maschinen
Germany GmbH
Dr.-Robert-Pfleger-Str. 26
D-96103 Hallstadt
303 4245
295 kg
2,2 kW
400 V ~50 Hz
DH 32 GSV
3000 U/min
20
NO.
SN
Year
J
DE
GB
FR
ES
IT
CZ
DK
FI
GR
HU
NL
PL
PT
RU
SE
SL
TR
Getriebebohrmaschine
Perceuse
Taladro
Søjleboremaskine
Επιδαπεδειο Δραπανο
Wiertarki
Máquina de perfuração
Bormașină
Pelarborrmaskin
Steberni vrtalni stroj
Sütunlu matkap
Gear upright drill
de engranaje
Alesatrice ad ingranaggi
Převodová vrtačka
Hammasvaihteellinen porakone
Hajtómûves fúrógép
Tandwiel aangedreven boormachine
med gearkasse
optimum-maschinen.de

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10Page 8 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
INFORMATION
If you are unable to rectify an issue using these operating instructions, please contact us for
advice:
Optimum Maschinen Germany GmbH
Dr. Robert-Pfleger-Str. 26
D-96103 Hallstadt, Germany
Email: [e-mail]
1.2 Safety instructions (warning notes)
1.2.1 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.
Symbol Alarm expres-
sion 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 damage to
property.
ATTENTION!
Situation that could cause damage to the geared drill and product, as well as
other types of damage.
No risk of injury to persons.
Information
Practical tips and other important or useful information and notes.
No dangerous or harmful consequences for people or objects.

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10 Page 9Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
1.2.2 Other pictograms
In case of specific dangers, we replace the pictogram with
or
general danger with a warning of injury to hands, hazardous electri-
cal voltage,
rotating parts.
Warning: danger of slip-
ping!
Warning: risk of stumbling! Warning: hot surface! Warning: biological hazard!
Warning: automatic start-
up!
Warning: tilting danger! Warning: suspended loads! Caution, danger of explo-
sive substances!
Switching on forbidden! Do not climb onto the
machine!
Read the operating instruc-
tions before commission-
ing!
Pull out the mains plug!
Wear protective glasses! Wear protective gloves! Wear safety shoes! Wear a protective suit!
Use ear protection! Only switch during stand-
still!
Protect the environment! Contact address

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10Page 10 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
1.3 Intended use
WARNING!
In the event of improper use of the geared drill
will endanger personnel,
will endanger the machine and other material property of the operating company,
the correct function of the geared drill may be affected.
The geared drill is designed and manufactured to be used in a non-explosive environment. The
geared drill is designed and manufactured for holes in cold metals or other non flammable
materials or that not constitute a health hazard using a rotating filing-stripping tool that has a
number of grooves for collecting the filings.
If the geared drill is used in any way other than described above, modified without authoriza-
tion of Optimum Maschinen Germany GmbH, then the geared drill 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 the guarantee or CE conformity will expire due to any constructive
technical or procedural changes which had not been performed by the company Optimum
Maschinen Germany GmbH.
It is also part of intended use that
observe the limits of the geared drill,
the operating manual is observed,
the inspection and maintenance instructions are observed.
 "Technical specification“ on page 20
WARNING!
Extremely severe injuries.
It is forbidden to make any modifications or alternations to the operation values of the
geared drill! They could endanger the personnel and cause damage to the geared drill.
1.4 Reasonably foreseeable misuse
Any use other than that specified under "Intended use" or any use beyond that described will be
deemed non-intended use and is not permissible.
Any other use must be discussed with the manufacturer.
It is only allowed to process metal, cold and non-inflammable materials with the geared drill.
In order to avoid misuse, it is necessary to read and understand the operating instructions
before first commissioning.
Operators must be qualified.
1.4.1 Avoiding misuse
Use of suitable cutting tools.
Adapting the speed adjustment and feed to the material and workpiece.
Clamp workpieces firmly and free of vibration.
ATTENTION!
The workpiece is always to be fixed by a machine vice, jaw chuck or by another
appropriate clamping tool such as for the clamping claws.
WARNING!
Risk of injury caused by flying workpieces.

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10 Page 11Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
Clamp the workpiece in the machine vice. Make sure that the workpiece is firmly clamped in the
machine vice and that the machine vice is firmly clamped onto the machine table.
Use cooling and lubricating agents to increase the durability of the tool and to improve the
surface quality.
Clamp the cutting tools and workpieces on clean clamping surfaces.
Sufficiently lubricate the machine.
Set the bearing clearance and guides correctly.
Recommendations:
Insert the drill in a way that it is exactly positioned between the three clamping jaws of the
quick action chuck.
When drilling, make sure that
the suitable speed is set depending on the diameter of the drill,
the pressure must only be such that the drill can cut without load,
if there is too much pressure, the drill will wear quickly and may even break or jam in the
borehole. If the drill jams, immediately stop the main motor by pressing the emergency stop
switch,
use commercial cooling/lubricating agents for hard materials, e.g. steel and
generally always back the spindle out of the workpiece while it is still turning.
INFORMATION
The drilling machines with frequency converter for regulating the speed are built according to
the standard EN 61800-3 class C.
WARNING!
Class C (machine tools) is not intended for use in residential buildings, in which the
power supply is provided via a public low voltage supply system. In these areas it may
possibly be difficult to guarantee electromagnetic compatibility due to lead bound as
well as emitted interferences.
1.5 Possible dangers caused by the geared drill
The geared drill was built using state-of-the-art technology.
Nevertheless, there is a residual risk as the geared drill operates with
high speeds,
rotating parts,
electrical voltage and currents.
We have used design and safety engineering to minimize the health risk to personnel resulting
from these hazards.
If the geared drill is used and maintained by personnel who are not duly qualified, there may be
a risk resulting from incorrect or unsuitable maintenance of the geared drill.
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
there may be a risk to personnel,
there may be a risk to the machine and other material values,
the correct function of the geared drill may be affected.

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10Page 12 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
Always disconnect the geared drill if cleaning or maintenance work is being carried out, or is no
longer in use.
WARNING!
The geared drill may only be operated with functional safety devices.
Disconnect the geared drill immediately, whenever you detect a failure in the safety
devices or when they are not fitted!
All additional devices installed by the operator must be equipped with the stipulated
safety devices. This is your responsibility as the operator!
 "Safety devices“ on page 14
1.6 Qualification of personnel
1.6.1 Target group
This manual is addressed to
operators,
users and
maintenance personnel.
Therefore, the warning notes refer to both, operation and maintenance personnel of the geared
drill.
Determine clearly and explicitly who will be responsible for the different activities on the geared
drill (operation, setting up, maintenance and repair).
Unclear responsibilities constitute a safety risk!
Always disconnect plug of the geared drill from the electrical power supply. 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. The operator may only carry out tasks that exceed normal
operation if this is stated in these instructions and the operating company has explicitly
entrusted him with the task.
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
Due to their professional training, knowledge and experience as well as knowledge of relevant
regulations, qualified personnel are able to perform the assigned tasks and to independently
recognise and avoid any possible dangers.
Instructed person
Instructed persons were instructed by the operating company regarding the assigned tasks and
any possible risks of improper behaviour.

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10 Page 13Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
1.6.2 Authorized persons
WARNING!
Inappropriate operation and maintenance of the geared drill constitutes a danger for the
personnel, objects and the environment.
Only authorized personnel may operate the geared drill !
Authorized operating and maintenance personnel are specialists instructed and trained by the
operator and the manufacturer.
Obligations of the operating company
train the personnel,
instruct the personnel in regular intervals (at least once a year) on
- all safety regulations relevant to the machine,
- its operation and
- generally accepted engineering standards.
check the personnel‘s knowledge level,
document the training/instruction,
have attendance at the training/instruction confirmed by signature and
check whether the personnel is working in a safety and risk-conscious manner and follow-
ing the operating instructions.
define and document the inspection deadlines for the machine in accordance with § 3 of the
Factory Safety Act and perform an operational risk analysis in accordance with § 6 of the
Work Safety Act.
Obligations of the operator
have obtained a training regarding the handling of the geared drill,
know the function and mode of action,
before taking the machine in operation
- have read and understood the operating manual,
- be familiar with all safety devices and instructions.
Additional
requirements
regarding the
qualification
Additional requirements apply for work on the following machine components:
Electrical parts or operating agents: shall only be performed by an electrician or under the
guidance and supervision of an electrician.
Before starting work on electrical parts or operating agents, the following actions must be
taken in the order given:
disconnect all poles,
secure against restarting,
check that there is no voltage.

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10Page 14 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
1.7 Operator positions
The operator position is in front of the geared drill.
Img.1-1: User positions
1.8 Safety measures during operation
CAUTION!
Danger due to inhaling dust and mist that are hazardous to health.
Depending on the materials to be machined and the agents used, dusts and mists can
arise that are detrimental to health.
Ensure that the harmful dust and mist generated are safely sucked off at the point of
origin and routed away from the working area or filtered. To do so, use a suitable
extraction unit.
CAUTION!
Risk of fire and explosion by using flammable materials or cooling lubricants.
Extra precautionary measures must be taken before machining flammable materials (e.g.
aluminium, magnesium) or using combustible agents (e.g. spirit) to avert a health
hazard.
1.9 Safety devices
Use the geared drill only with properly functioning safety devices.
Stop the geared drill immediately, if a safety device fails or is faulty or becomes ineffective.
It is your responsibility!
If a safety device has been activated or has failed, the geared drill must only be used if you
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 geared drill. The possible
consequences are:
injuries due to components or workpieces flying off at high speed,
contact with rotating parts,
fatal electrocution,
The geared drill features the following safety devices:
an EMERGENCY STOP push button,

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10 Page 15Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
a drilling table with T-slots to fix the workpiece or a vice,
a drill chuck guard, in order to prevent interference with the rotating tool.
INFORMATION
The geared drill can only be switched on if the drill chuck guard is closed.
WARNING!
Although the isolating safety devices provided and delivered with the machine are
designed to reduce the risks of workpieces being ejected or parts of tools or workpieces
breaking off, they cannot eliminate these risks completely. Always work carefully and
observe the limits of the machining process.
1.10 Safety check
Check the geared drill before each start-up or at least once per shift. Inform the person respon-
sible immediately of any damage, defects or changes in the operating function.
Check all safety devices
at the beginning of each shift (with the machine stopped),
once a week (with the machine in operation) and
after all maintenance and repair work.
Check that prohibition, warning and information signs and the labels on the geared drill
are legible (clean them, if necessary)
are complete (replace if necessary).
INFORMATION
Organise the checks according to the following table;
General check
Equipment Check OK
Guards Mounted, firmly bolted and not damaged
Signs,
Markers
Installed and legible
Date: Checked by (signature):
Functional check
Equipment Check OK
EMERGENCY STOP
push button
After actuating the EMERGENCY STOP push button the
geared drill must be switched off.
Drill chuck guard The geared drill can only be switched on if the drill chuck
guard is closed. The engine must switch off when the drill
chuck guard is opened during operation.
Date: Checked by (signature):

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10Page 16 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
1.11 EMERGENCY STOP push button
ATTENTION!
The drilling spindle keeps turning for a short time even after actuating the EMERGENCY-
STOP push button depending on the preset speed.
Img.1-2: EMERGENCY-STOP
1.11.1 Main switch
In the "0" position, the lockable main switch can be secured against accidental or non-author-
ised switching on by means of a padlock.
The power supply is interrupted by switchingoff the main plug.
Except for the areas marked by the pictogram in the margin. In these areas there might be volt-
age, even if the main switch is switched-off.
Img.1-3: Main switch
WARNING!
Dangerous voltage even if the main switch is switched off.
The areas marked by the pictogram might contain live parts, even if the main switch is switched
off.
1.11.2 Drill chuck guard
Adjust the guard to the correct height before you start working.
To do so, slacken the clamping screw, set the required height and re-tighten the clamping
screw.
There is a switch integrated in the spindle protection mounting which monitors the closed posi-
tion.
Emergency stop
push button
Main switch

OPTIMUM
MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10 Page 17Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
INFORMATION
The machine cannot be started, if the drill chuck guard is not closed.
Img.1-4: Drill chuck guard
1.12 Personal protective equipment
For some works you need personnel protective equipment as protective equipment. These are
Safety helmet,
protective glasses or face guard,
protective gloves,
safety shoes with steel toe caps,
ear protection.
Before starting work make sure that the required personnel protective equipment is available at
the work place.
CAUTION!
Dirty or contaminated personnel protective equipment can cause illness.
Clean your personal protective equipment
after each use,
regularly once a week.
Personal protective equipment for special works
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.
Wear safety shoes when you assemble, disassemble or transport heavy components.
Clamping screw
Drill chuck guard

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MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10Page 18 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
1.13 Safety during operation
We provide information about the specific dangers when working with and on the geared drill in
the descriptions for these types of work.
WARNING!
Before switching on the geared drill make sure that there are
no dangers generated for persons,
no objects are damaged.
Avoid any unsafe work methods:
Make sure that your operation does not create a safety hazard.
The rules specified in these operating instructions must be observed during assembly,
operation, maintenance and repair.
Do not work on the geared drill if your concentration is reduced, for example, because you
are taking medication.
Observe the accident prevention regulations issued by your Employers Liability Insurance
Association or other supervisory authorities applicable to your company.
Inform the supervisor about all hazards or faults.
Stay on the geared drill until the machine completely stopped moving.
Use the specified personal protective equipment. Ensure you wear close-fitting clothing
and, if necessary, a hairnet.
Do not use protective gloves when drilling.
1.14 Safety during maintenance
Inform the operators in good time of any maintenance and repair works.
Report all safety relevant changes and performance details of the geared drill or their opera-
tional behavior. Any changes must be documented, the operating instructions updated and
machine operators instructed accordingly.
1.14.1 Disconnecting and securing the geared drill
Switch off the geared drill with the main switch and secure the main switch with a padlock
against unauthorised switching-on or switching-on by accident.
All machine parts as well as all dangerous voltages are switched off. Excepted are only the
positions which are marked with the adjoining pictogram.
1.15 Using lifting equipment
WARNING!
The use of unstable lifting and load suspension equipment that might break under load
can cause severe injuries or even death.
Check that the lifting and load suspension gear
they have sufficient load carrying,
and that it is in perfect condition.
Observe the accident prevention regulations issued by your Employers Liability
Insurance Association or other supervisory authorities applicable to your company.
Fasten the loads properly. Never walk under suspended loads!

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MASCHINEN - GERMANY
Safety
Version 1.2.5 dated 2017-03-10 Page 19Original operating instructions
DH26GTV | DH28GSV | DH32GSV GB
1.15.1 Mechanical maintenance
Reinstall all protection and safety devices after any maintenance work once the work has been
completed.This includes:
covers,
safety instructions and warning signs,
grounding cables.
Check if they are working properly!
1.16 Accident report
Inform your supervisors and Optimum Maschinen Germany GmbH immediately in the event of
accidents, possible sources of danger and any actions which almost led to an accident (near
misses).
There are many possible causes for "near misses".
The sooner they are notified, the quicker the causes can be eliminated.
1.17 Electronics
Have the machine and/or the electric equipment checked regularly. Immediately eliminate all
defects such as loose connections, defective wires, etc.
A second person must be present during work on live components to disconnect the power in
the event of an emergency. Disconnect the machine immediately if there is a malfunction in the
power supply!
Comply with the required inspection intervals in accordance with the factory safety directive,
operating equipment inspection.
The operating company of the machine must ensure that the electrical systems and operating
equipment are inspected with regards to their proper condition, namely,
by a qualified electrician or under the supervision and direction of a qualified electrician,
prior to initial commissioning and after modifications or repairs, prior to recommissioning
and at certain intervals.
The deadlines must be set so that arising, foreseeable defects can be detected in a timely man-
ner.
The relevant electro-technical rules must be followed during the inspection.
The inspection prior to initial commissioning is not required if the operator receives confirma-
tion from the manufacturer or installer that the electrical systems and operating equipment com-
ply with the accident prevention regulations, see conformity declaration.
Permanently installed electrical systems and operating equipment are considered constantly
monitored if they are continually serviced by qualified electricians and inspected by means of
measurements in the scope of operation (e.g. monitoring the insulation resistance).
1.18 Inspection deadlines
Define and document the inspection deadlines for the machine in accordance with § 3 of the
Factory Safety Act and perform an operational risk analysis in accordance with § 6 of the Work
Safety Act. Also use the inspection intervals in the maintenance section as reference values.

OPTIMUM
MASCHINEN - GERMANY
Technical specification
Version 1.2.5 dated 2017-03-10Page 20 Original operating instructions
DH26GTV | DH28GSV | DH32GSVGB
2 Technical specification
The following information represents the dimensions and indications of weight and the manu-
facturer‘s approved machine data.
Explanation of abbreviations:
*GTV - Bench drilling machine with frequency converter for infinitely variable speed adjust-
ment.
*GTS - Column drilling machine with frequency converter for infinitely variable speed adjust-
ment.
DH GTV DH 28 GSV DH32 GSV
Electrical connection 230V ~50 Hz 1.5 kW 400V ~50 Hz 1.5 kW 400V ~50 Hz 2.2 kW
Drilling capacity in steel (S235JR)
[mm] 24 26 30
Continuous drilling capacity in steel
(S235JR) [mm] 21 23 26
235mm 260mm 285mm
127mm 127mm 125mm
Spindle seat MT3 MT3 MT4
Table size
Length x Width of the working surface 380 x 380mm 376 x 394mm 400 x 420mm
14mm 14mm 14mm
Distance spindle - table [mm] 450 875 820
Maximum distance [mm]
spindle - stand 610 1285 1270
Throat depth
Spindle stroke
T-slot size