BDB 8325 - Drill Baier - Free user manual and instructions

USER MANUAL BDB 8325 Baier

NOTE The figures 1 and 2 are exemplary illustrations, i.e. depending on the type or revision status of the equipment you have, there may be differences between the named figures in this instruction manual and your equipment or machine. Figures 3 , 4 , 5 , 11 and 13 show the drill stand BST 250; the functions of the BST 420 drill stand are similar. It is therefore not illustrated separately.

1.2 Symbols used in the instruction manual .. 2

2.6.1 Operating personnel requirements .......... 4

2.6.8 Hazards when using and handling the

2.6.10 Explanation of the pictograms on the

5.2 Fixing the drive unit to the drill stand ..... 15

5.3 Connecting the water supply ................. 15

5.4 Installing the drill stand with plug fixing . 15

5.4.1 Fixing onto the wall ................................. 16

5.5 Installing the drill stand with vacuum

5.7 Adjusting the tilt at the drill stand ........... 16

5.8 Switching on the drive unit and drilling .. 16

5.9 Ending the drilling process ..................... 17

• 6 Cleaning p. 18
• 7 Maintenance p. 18
• 8 Handling wet diamond core drill bits 18 9 Disposal p. 19
• 10 Scope of Supply p. 19
• 11 Warranty Imprint Version V01 / 2020-07 Copyright: Maschinenfabrik OTTO BAIER GmbH Heckenwiesen 26 71679 Asperg Germany It is prohibited to forward or reproduce this docu- ment or to exploit and disclose its contents, unless expressly permitted. Any infringements will result in liability to pay compensation for damages. All rights reserved in case of patent, utility model or design registration. This instruction manual has been prepared with the greatest possible care. Nonetheless, OTTO BAIER GmbH does not accept any liability whatsoever for possible errors in this instruction manual and their consequences. Equally, no liability whatsoever is accepted for direct or consequential damage or losses resulting from improper use of the machine. The national health and safety regulations and the requirements of this instruction manual are to be observed when using the machine. All product names and brand names used are the property of the holder and are not explicitly marked as such. Subject to change without notice. Contents| 30 | p. 20

WARNING “WARNING” indicates an imminent hazard, which could result in death or severe physical injuries. Î This arrow indicates appropriate measures to avert the pending hazard. CAUTION “CAUTION” indicates an imminent hazard, which can result in minor or moderate physical injuries. Î This arrow indicates appropriate measures to avert the pending hazard. NOTE “NOTE” indicates possible property damage, gives use recommendations and helpful tips. 2 General safety instructions for power tools WARNING Read all safety instructions and precautions marked with the symbol. Failure to observe the safety instructions and precautions can result in electric shock, fire and / or serious injuries. Keep all safety instructions and precautions for future reference. The term “power tool” used in the safety instruc- tions refers to mains-operated power tools (with mains power lead) and battery-operated power tools (without mains power cable). 1 About this instruction manual This instruction manual contains all important information necessary for safe handling of the wet diamond drilling systems. In this instruction manual the drive unit is also referred to as the “tool” or “machine”. Figure references References to figures, which are located at the beginning of the instruction manual are displayed in the text with this symbol

(here, for example, the reference is to Figure number 1).

1.1 Important information

Read the instruction manual Before starting any work with or on the tool, this instruction manual, the safety instructions and the warnings must be read through carefully and observed. Read and follow the separate instruction manual for the corresponding drill stand. Always keep this instruction manual together with the equipment. An approved half-mask with filter must be worn!

1.2 Symbols used in the instruction

manual DANGER “DANGER” indicates an imminent hazard, which will result in immediate death or severe physical injuries. Î This arrow indicates appropriate measures to avert the pending hazard.| 31 |

2.1 Workplace safety

a) Keep your work area clean and well illuminated. Untidiness and unlit work areas can result in accidents. b) Never use the power tool in potentially explosive environments containing flamma- ble liquids, gases or dusts. Power tools generate sparks which can ignite dust or vapours. c) Keep children and other persons away from the power tool during use. A moment’s distraction can cause you to lose control of the machine.

2.2 Electrical safety

a) The connecting plug of the power tool must fit in the plug socket. The plug must not be modified in any way. Do not use adapter plugs in conjunction with power tools with protective earth conductor. Unmodified plugs and properly fitting plug sockets reduce the risk of electric shock. b) Avoid physical contact with earthed sur- faces such as pipes, heaters, cookers and refrigerators. There is an increased risk of an electric shock if your body is earthed. c) Keep power tools away from rain and moisture. The ingress of water into a power tool increases the risk of an electric shock. d) Do misuse the cable in any way by using it to carry or hang up the power tool or to pull the plug out of the socket. Keep the cable away from heat, oil, sharp edges and moving machine parts. Damaged or kinked cables increase the risk of an electric shock. e) When working with a power tool outdoors, use only extension leads that are suitable for outdoor use. Use of an extension lead suitable for outdoor use reduces the risk of electric shock. f) If the use of the power tool in a damp environment is unavoidable, use a residual- current circuit breaker. Use of a residual-current circuit breaker (RCCB with 10 mA maximum tripping current) reduces the risk of an electric shock.

2.3 Safety of people

a) Always work carefully, attentively and sensi- bly when using a power tool. Do not use the power tools if you are tired or are under the influence of drugs, alcohol or medication. A moment of inattention while using the power tool can result in serious injuries. b) Wear personal protective equipment and always wear goggles. The wearing of personal protective equipment, such as dust mask, non-slip safety shoes, helmet or ear protectors, depending on the type and application of the power tools, reduces the risk of injuries. c) Avoid accidental switching on of the power tool. Ensure that the power tool is switched off before connecting it to the mains power supply and/or connecting the battery and before picking up or carrying the tool. If you have your finger on the switch when carrying the power tool or you connect the tool to the power supply when it is switched on, this can lead to accidents. d) Remove the adjusting tools or wrenches before switching on the power tool. A tool or wrench in a rotating part of the tool can result in injuries. e) Avoid abnormal postures when working. Ensure you are standing firmly and maintain your balance at all times. This will enable you to control the power tool better in unexpected situations. f) Wear suitable clothing. Do not wear loose clothing or jewellery. Keep your hair, cloth- ing and gloves away from moving parts. Loose clothing, jewellery and long hair can get caught in moving parts.| 32 |

g) If dust extractor and collection equipment can be mounted, they must be connected and used correctly. Use of a dust extraction system can reduce the hazards caused by dust. h) Don’t be lulled into a false sense of safety and do not break the safety rules for power tools even if, after much use, you are familiar with the power tool. Careless action can cause severe injuries within fractions of a second.

2.4 Using and handling the power

tool a) Do not overload the power tool. Use the intended power tool for your work. You work better and safer within the given power range if you use the suitable power tool. b) Do not use a power tool whose switch is defective. A power tool which can no longer be switched on or off is dangerous and must be repaired. c) Remove the plug from the plug socket and/ or remove the battery before carrying out tool adjustments, changing accessories or placing the tool aside. This precautionary measure prevents uninten- tional starting of the power tool. d) Store power tools out of the reach of chil- dren when not in use. Do not allow people to use the power tool if they are not familiar with it or if they have not read this instruc- tion manual. Power tools are dangerous if they are used by inexperienced people. e) Maintain power tools with care. Check whether moving parts are in proper working order and do not jam, whether parts are broken or damaged in such a way that they impair the function of the power tool. Have damaged parts repaired before using the tool. Many accidents are caused by poorly serviced and maintained power tools. f) Keep cutting tools sharp and clean at all times. Carefully maintained cutting tools with sharp cutting edges jam less easily and are easier to control. g) Use the power tool, insert tools, etc. in ac- cordance with this instruction manual. Take into consideration the working conditions and the work to be carried out. Use of power tools for other than the intended applications can lead to dangerous situations. h) Keep the handles and gripping surfaces dry, clean and free from oil and grease. Slippery handles and gripping surfaces prevent safe operation and control of the power tool in unforeseen situations.

a) Have your power tool repaired by qualified personnel only and use original spare parts only. This will ensure that the safety of the power tool is maintained.

2.6 Safety instructions for wet

diamond drilling systems

2.6.1 Operating personnel

• People below the age of 18 may not use the machine.

• The operating personnel must be familiar with the content of this instruction manual.

2.6.2 Safety instructions for all work

• Wear hearing protection when hammer drilling/diamond drilling. Exposure to noise can cause loss of hearing.

• Use the additional handle(s). Loss of control can result in injuries.

• Support the power tool properly before using. This power tool produces a large torque. If the power tool is not properly supported during use, the use can loose control of it and injuries can occur.| 33 |

2.6.3 Workplace safety

• Secure the work area also behind openings and cutouts. Unsecured work areas can endanger you and other people.

• Watch out for open and concealed electric- ity cables, and water and gas pipes. Use suitable detectors to find concealed utility pipes and cables, or contact the local utility company for advice. Contact with electricity cables can cause fires and an electric shock. Damage to a gas pipe can cause an explosion. Penetrating a water pipe causes damage to property or could cause an electric shock.

• Do not use the power tool near flammable materials. Sparks could ignite these materials.

• Avoid causing situations where other people can stumble or trip. Tripping over cables can cause serious injuries.

• Secure the workpiece. A workpiece securely held in clamping devices or a vice is more safely held than in the hand.

• Avoid dust accumulation in the workplace. Dusts can easily ignite.

• Ensure adequate ventilation in closed rooms. Risk due to dust and impaired vision.

• When carrying out drilling work that requires the use of water, route the water away from the work area or use a liquid collection device. Such precautions keep the work area dry and reduce the risk of an electric shock.

• Inform and consult the responsible structur- al engineer, architect or the responsible site engineer about planned drilling. Cut through reinforcement only with the approval of a structural engineer.

• When drilling through walls or ceilings, ensure that people and work areas on the other side are protected. The core drill bit can extend beyond the drill hole and the drilled core can fall out on the other side.

• Before drilling holes drilling objects, check the rooms concerned for obstructions and block off this area. Use formwork to secure the drill core against falling.

• Dust from materials such as coatings con- taining lead, several types of wood, minerals and metals can be harmful to health and cause allergic reactions, respiratory diseas- es and/or cancer. Asbestos-containing material may only be machined by specialists. f Where possible use dust extraction suitable for the material. f Ensure the workplace is properly ventilated. f We recommend wearing a face mask respi- rator with filter class P2 or P3 (to EN 149:2001). Observe the relevant regulations in your country for the materials to be machined.

2.6.4 Electrical safety

• The power tool may only be used for wet drilling if operated with a perfectly function- ing PRCD personal protection switch (see page 41).

• Before each use, check the power tool, connection cable and plug for damage. Damaged equipment is dangerous, and no longer safe to use.

• Note the mains voltage! The power source voltage must match the details given on the rating plate of the power tool.

• If using the power tool with mobile genera- tors, loss of power or atypical behaviour on switching on is possible.

• Do not use the power tool if the cable is damaged. Do not touch the damaged cable and disconnect the mains plug if the cable is damaged while you are working. Damaged cables increase the risk of an electric shock.

• Only use extension cables suitable for the machine's power consumption and which have a minimum core cross-section of

. If you use a cable drum, always completely unwind the cable. The rolled up cable can heat up and start to burn.| 34 |

• Regularly clean the ventilation slots of your power tool by blowing it out. Never use liquids. Never insert screwdrivers or any other objects into the ventilation slits. Do not cover the ventilation slits. The motor fan draws dust into the housing and a large accumulation of metal dust can cause electrical hazards.

• External electromagnetic interference (e.g. mains voltage fluctuations, electrostatic discharges) can cause the power tool to switch off automatically. In this case, switch off the power tool and then switch it back on again.

• Before use, check all water-carrying parts – including those of the accessories – for perfect working order and leaks. Leaking water increases the risk of an electric shock.

2.6.5 Safety of people

• Wear personal protective equipment and, depending on the work situation, use: Full-face protection, eye protection or safety glasses/goggles, hard hat and special apron Protect yourself against debris thrown up by wearing a hard hat, safety gog- gles or face protection and wear an apron, if necessary. Hearing protection The typical A-weighted sound pres- sure level of this power tool is over 85 dB (A) while working with the tool. If you are exposed to loud noise for lengthy periods, there is a risk of hear- ing damage or even hearing loss. Anti-vibration safety glove The wearing of anti-vibration safety gloves is recommended for a release value A (8) for arm-hand vibrations of over 2.5 m/s

Non-slip safety footwear Dust mask, half-face filter mask or face mask respirator Inhaling fine mineral dust can cause health damage. We recommend wear- ing a face mask respirator with filter class P2 or P3 (to EN 149:2001). Wet drilling: Working with wet dia- mond core drill bits is a grinding pro- cess, during which extremely fine dust is produced, which is bound by the added water. If the used water with the bound dust is not collected, the bound dust is re-released after drying. When drilling materials containing quartz, the risk of silicosis is very high; therefore, the machine may therefore only be used in wet operation.

• Ensure other people keep a safe distance from your work area. Any person entering the work area must be wearing personal protective equipment. Broken pieces of the workpiece or broken insert tools can fly off and cause injuries, even outside the immediate work area.

• Operate the power tool by holding the insulated gripping surfaces when carrying out work during which the cutting tool can hit concealed electrical cables or the tool's own power lead. Contact of a cutting tool with a live cable can also energise metallic parts of the power tool and result in an electric shock.

• Keep the mains power lead away from rotating insert tools. If you lose control of the tool, the mains power lead can be cut or caught and your hand or arm can be pulled into the rotating insert tool.

• Never put down the power tool until the insert tool has come to a complete standstill. The rotating insert tool can come into contact with the surface on which the power tool is placed, which could cause you to lose control of the power tool.| 35 |

• Do not leave the power tool running while you are carrying it. Your clothing can get caught by inadvertent contact with the rotating insert tool and the insert tool can drill into your body.

• If the machine is switched on, do not direct insert tools towards your own or other people's bodies. Do not touch or take hold of the tools.

• Always use the additional handle supplied with the tool. Loss of control of the machine can result in injuries.

• Do not use this tool for overhead drilling with water supply. The ingress of water into the power tool increases the risk of an electric shock.

2.6.6 Hazards when using and

handling the power tool

• If the machine is used for hand-held drilling, always hold both handles firmly when switching on and while working with the ma- chine. When switching on and while working with the machine, expect reaction torques (e.g. due to sudden jamming or breakage of the insert tool).

• If the insert tool becomes blocked, stop exerting feed and switch off the tool. Check the reason for the jamming and remove the cause of jammed insert tools.

• If you want to restart a diamond drill, which is in the workpiece, before switching on, check whether the insert tool rotates freely. If the insert tool jams, it possibly does not rotate and this can cause overloading of the tool, or can cause the diamond drill to detach itself from the workpiece.

• Do not use any accessories, which have not been especially provided and recommended for this power tool by the manufacturer. Just because you can attach the accessories to your power tool is not a guarantee of safe use.

• The approved speed of the insert tool must be at least as high as the maximum speed given on the power tool. Accessories which rotate faster than approved can break and fly off the tool.

• Change insert tools carefully and only use the mounting tools provided, if they are in perfect condition. Disconnect the mains plug before changing the insert tool. Use of the mounting tool provided prevents damage to the power tool and insert tool.

• Never use damaged insert tools. Before each use, check insert tools for splinters and cracks. If the power tool or insert tool is dropped or falls, check whether it is damaged, or use an undamaged insert tool. If you have checked and inserted the insert tool, keep yourself and other people nearby outside the plane of the rotating insert tool and let the power tool run at maximum speed for one minute. Most damaged insert tools break during this test period.

• Do not expose power tools to extreme heat or cold. Mechanical and electrical damage can occur during extreme heat and/or cold.

• Allow the insert tools, tool holders and other parts cool in the immediate vicinity of the work area after use. The equipment can be very hot after use. Do not touch or grip the parts. Risk of injury.

• Additional signs or other, non BAIER-specif- ic parts may not be screwed or riveted onto the motor, handle, gearbox or protective housing. This could damage the power tool and cause malfunctions to occur.

• When fixing the drill stand on the workpiece using anchors and screws, ensure that the anchoring used is able to hold the machine safely during use. If the workpiece is not resistant or is porous, the anchor can be pulled out, which causes the drill stand to detach from the workpiece.| 36 |

• If fixing the drill stand on the workpiece by means of a vacuum plate, ensure that the surface is smooth, clean and not porous. Do not fix the drill stand onto laminated surfac- es, such as tiles and facings of composite materials. If the surface of the workpiece is not smooth, flat or adequately fixed, the vacuum plate can detach from the workpiece.

• Before and while drilling, ensure that the vacuum is sufficient. If the vacuum is insufficient, the vacuum plate can detach from the workpiece.

• Never carry out overhead drilling and drilling in the wall, if the machine is only fixed by means of a vacuum plate. In the event of loss of vacuum, the vacuum plate detaches from the workpiece.

• Avoid unnecessary noise emissions.

• Note and follow the safety and work instruc- tions for the accessories used.

2.6.7 Safety instructions for using

• Never work with a higher speed than the maximum allowable speed of the drill bit At higher speeds the drill bit can bend easily, if it can twist itself free without contact with the workpiece and result in injuries.

• Always start drilling at a low speed and while the drill has contact with the workpiece. At higher speeds the drill bit can bend easily, if it can twist itself free without contact with the workpiece and result in injuries.

• Do not exert excessive pressure and only press in the longitudinal direction of the drill bit. Drill bits can bend and therefore break or result in a loss of control and injuries.

2.6.8 Hazards when using and

handling the drill stand

• Before mounting the drill or drive unit, set up the drill stand correctly in accordance with these instructions. Correct assembly is important to ensure proper, faultless functioning of the stand.

• Fasten the drill stand securely on a firm, flat surface using the specified and undamaged installation materials. If the drill stand can slip or wobble, the drill or drive unit cannot be guided uniformly and safely.

• Disconnect the plug of the drill or drive unit from the socket before mounting the drill or drive unit on the drill stand, make any unit settings or change accessory parts. Unintentional starting of drills or drive units causes accidents.

• Fix the drill or drive unit securely onto the drill stand as specified before starting work. Slipping of the drill or drive unit on the drill stand can cause loss of control and injuries.

• Remove all setting tools, spanners and installation materials not required before switching on the drill or drive unit. Setting tools, spanners and installation materials located in/on a rotating part of the unit can result in injuries.

• Do not overload the drill stand and do not use it as a ladder or scaffolding. Overloading or standing on the drill stand can cause the centre of gravity of the drill stand to move upwards and the drill stand overturns.

• Do not use any accessories that have not been especially provided and recommended for this drill stand by the manufacturer. Just because you can attach accessories to your drill stand is not a guarantee of safe use.

• Additional signs or other, non-BAIER-specif- ic parts must not be screwed or riveted onto the drill stand. This could damage the drill stand and cause malfunctions to occur.

• Note and follow all safety and work instruc- tions for the accessories used.

• Never place the feed crank handle on the hexagon of the tapered shaft to tighten it. Excessive torques could damage it.| 37 |

2.6.9 Service / Maintenance / Repair

• If the power tool is dropped or becomes wet, have it checked. A possibly damaged power tool is dangerous and no longer safe to operate. Before using the power tool again, have it checked by our cus- tomer service or an authorised service centre of Maschinenfabrik OTTO BAIER GmbH.

• Repair and maintenance work may only be carried out by an authorised workshop of Maschinenfabrik OTTO BAIER GmbH. Otherwise, all liability and warranty claims against Maschinenfabrik OTTO BAIER GmbH expire. NOTE When using new carbon brushes, the machine may only be operated within the green range for the first 15 minutes – observe LED display in cap of the drive unit (BDB 835: Item 6, see Figure

and BDB 8325: Item 6, see Figure

• Ensure that original BAIER spare parts and original BAIER accessories only are used when needed. Original parts are available from authorised dealers. Use of non original parts can cause damage to the machine and an increased risk of accidents.

• Regular servicing by Maschinenfabrik OTTO BAIER GmbH or a servicing and repair company authorised by us is specified. Many accidents are caused by poorly serviced and maintained power tools.

2.6.10 Explanation of the pictograms

on the machine The CE mark on a product means that the product conforms with all the applicable European regulations and has been subjected to the prescribed conformity assessment procedures. Protection class I equipment The machine is insulated in such a way that it has no exposed metal parts that could be live in the event of a fault. An additional safeguard becomes active if the basic insulation fails. Environmentally friendly disposal of waste equipment Waste equipment contains valuable recyclable materials which should be reused or recycled. Batteries, lubricants and similar materials must not be allowed to get into the environment. Therefore, please dispose of waste equip- ment through suitable collection systems. Wear hearing protection! The typical A-weighted sound pressure level of this power tool is over 85 dB (A) – wear ear protectors when working with the tool! Read the instruction manual! Before starting any work with or on the machine, this instruction manual, the safety instructions and the warnings must be read through carefully and observed.| 38 |

3 Technical Characteristics

Wet core drill bit diameter (mm), min / max 60 / 400 Drilled depth (mm) max. 650 Bit holder 1¼ UNC and G½ Weight (kg)

(sound pressure) dB (A) 91

(sound power) dB (A) 101 Vibration measurement m/s

Wet core drill bit diameter (mm), min / max 40 / 250 Drilled depth (mm) max. 650 Bit holder 1¼ UNC and G½ Weight (kg)

(sound pressure) dB (A) 91

(sound power) dB (A) 101 Vibration measurement m/s

Speed ranges dependent on the wet diamond core drill bit diameter: Wet diamond drilling system BDB 835 No-load speed (min

) 310 620 1400 Wet core drill bit diameter (mm) 140 – 250 70 – 140 40 – 70 The given speeds are to be viewed as maximum speeds for the given wet diamond core drill bit diameters. Depending on the property of the material to be drilled, such as concrete with steel reinforcement of differ- ent thicknesses, the speed is set "by feel". When drilling through concreted in steel with large wet diamond core drill bit diameters the 1st gear is always set.| 39 |

Weight according to EPTA procedure 01/2003.

Measured values for noise determined according to EN 60745. Wear hearing protection!

Total vibration values (vector sum in three directions) determined according to EN 60745 The vibration emission values given in this instruction manual have been measured according to a method of measurement standardised in EN 60745 and can be used for comparison between power tools. They are also suitable for a preliminary estimate of the vibratory stresses. The vibration emission values given represent the main applications of the power tool. If the power tool is used for other applications, with different insert tools or are insufficiently serviced, this can significantly increase the vibratory stresses over the whole work period. For a precise estimate of the vibration emis- sion values, the times during which the tool is switched off or is running but not actually in use should also be taken into account. This can reduce the vibration stresses over the whole work period significantly. WARNING Health risk due to vibrations. Î Additional safety measures should be taken to protect the user, e.g. wearing anti-vibration pro- tective gloves, correct maintenance of power tools and insert tools, keeping hands warm and good organisation of work sequences.

3.2 EU Declaration of Conformity

EN61000-3-3:2013 In accordance with the provisions of the Directives 2006/42/EC 2011/65/EU in conjunction with the safety instructions documented in the instruction manual and the specified intended use. The head of development is authorised to write the technical documents. These are available from: Maschinenfabrik OTTO BAIER GmbH, Heckenwiesen 26, 71679 Asperg Germany Thomas Schwab Managing Director Robert Pichl Head of development Asperg, 02.04.2020| 40 |

The BDB 835 and BDB 8325 wet diamond drilling systems are only designed for use with a suitable drill stand. Read and follow the separate instruction manu- al for the corresponding drill stand. NOTE The drive units are not suitable for overhead drilling or for hand-held operation. It can also be run with a water suction kit. The wet diamond drilling systems, in conjunction with wet diamond core drill bits and a water supply, are intended for wet drilling into mineral materials such as concrete, reinforced concrete or masonry. Do not drill in the following materials: wood, metal and glass, etc. Observe the relevant regulations in your country for the materials to be machined and extraction.

3.3 Machine characteristics

The machines are equipped with specially developed electronics with soft start. It monitors the speed and, with the green / red indicator lights (BDB 835: Item 6 and 7, see Figure

and BDB 8325: Item 6 and 7, see Figure

) it helps to achieve favourable work progress and therefore working conditions that do not damage the tools. Visual display Green: Speed for optimum drilling performance Red: Speed too low – stopping If this warning signal is ignored, i.e. the feed is not reduced, the electronics switch off on overload. After the wet diamond core drill bit has stopped, remove it from the drill hole. The machine can be immediately restarted. 8 The drive unit is equipped with a personal protection switch (PRCD - personal residual current device).

3.4 Machine parts and controls

Wet drilling system BDB 8325 1 Water connection 2 Output shaft 3 Personal protection switch PRCD 4 Gear change knob (-3 gear) 5 Drive unit BDB 8325 6 Green LED 7 Red LED 8 ON/OFF switch| 41 | 4 Before Starting Work To ensure safe working with the wet diamond drilling systems, the following points must always be observed before each use:

• Read through all safety instructions and warn- ings in this instruction manual.

• Wear protective clothing such as hard hat, face protection or safety goggles, safety gloves, suit- able half-face filter mask, slip-resistant safety footwear and if necessary an apron.

• The voltage on the rating plate must be identical with the mains voltage.

• Before each use, check the machine, connec- tion cable, plug, secure fit of the wet diamond core drill bit and the fixing of the drill stand.

• Always note the thread dimension of the wet diamond core drill bit holder. The thread of the wet diamond core drill bits must fit on the thread of the drive unit (G½" internal thread or 1¼" UNC external thread) without any clearance. Do not use reducers or adaptors to fit the wet diamond core drill bits.

• Check the condition of the wet diamond core drill bits with a visual inspection.

• Mounting the feed crank handle:

Push the feed crank handle (3), as required, to the left or right onto the pinion shaft (4) so that the drillhole in the feed crank handle (2) and in the pinion shaft (1) coincide.

Push the pin of the tube lock (1) through the matching holes (2) and push until the clip is snapped into position.

BST 250 The spindle head (2) can be locked by pulling the clamping lever (1). This secures the spin- dle head against unexpected movements.

BST 420 Pull out the locking pin (2) in the spindle head (1), turn through 90° and allow it to latch into the feed shaft. To do this, it may be necessary to move the spindle head (1) up or down slightly using the feed crank handle. This secures the spindle head (1) against unexpected movements. NOTE Damaged wet diamond core drill bits may not be used and must be replaced immediately.

• Only use diamond core drill bits recommended by OTTO BAIER GmbH for the respective area of use. NOTE The wet diamond core drill bit can become irreparably damaged by overheating or jamming in the drill core hole (see “Handling wet diamond core drill bits” on page 46). If harmful dust is produced during the work, a suitable dust extractor must be connected to the wet diamond drilling system (e.g. BAIER special dust extractor).

• Connect a suitable water supply (e.g. BAIER water pressure tank).

• Connect a suitable water suction device (e.g. BAIER special dust extractor).

Checking the personal protection switch DANGER Risk of injury due to electric shock. Î The personal protection switch PRCD must be checked each time before the drive unit is start- ed (see below). If the PRCD does not trip during the test or if it repeatedly switches off when the drive unit is switched on, the drive unit together with the personal protection switch PRCD must be examined by a qualified electrician.

With the mains plug plugged in and the drive unit switched off, press the −ON− button (-RESET) (2). The red indicator light (1) must light up.

Press the −ON− (RESET) button (2) again. The drive unit must now be able to be switched on.| 42 |

• If the PRCD does not trip during the test or if it repeatedly switches off when the drive unit is switched on, the drive unit together with the personal protection switch PRCD must be examined by a qualified electrician.

• Operation of the wet diamond drilling system with a defective PRCD personal protection switch is not permitted – risk of fatal injuries.

• Set the appropriate speed for the core drill bit diameter (see “Technical specifications” on page 38) at the gear change knob (BDB 835: Item 4, see Figure

and BDB 8325: Item 4, see Figure

NOTE Changing gear while the machine is running can cause damage to the drill. Wait for the machine to completely stop. 5 Operation and Control

5.1 Fitting or changing the wet

diamond core drill bit DANGER Risk of injury due to electric shock. Î Disconnect the mains plug before carrying out any work on the drive unit. CAUTION Risk of injury due to hot drill bits. Î The drill bits fitted can get hot if used for a lengthy time. Wear safety gloves when chang- ing the drill bits or allow the drill bits to cool first. NOTE The drive unit must be fixed onto the drill stand by means of the bolt-on plate first (see “5.2 Fixing the drive unit to the drill stand” on page 43), before a wet diamond core drill bit is fitted.

Screw the wet diamond core drill bit (2) onto the 1¼" UNC external thread or the wet diamond core drill bit (3) into the G½" internal thread of the output shaft (1), up to the limit stop (right- hand thread).

• Lock the spindle head:

BST 250 The spindle head (2) can be locked by pulling the clamping lever (1). This secures the spin- dle head against unexpected movements.

BST 420 Pull out the locking pin (2) in the spindle head (1), turn through 90° and allow it to latch into the feed shaft. To do this, it may be necessary to move the spindle head (1) up or down slightly using the feed crank handle. This secures the spindle head (1) against unexpected movements.

Tighten the wet diamond core drill bit (2) using an open-ended spanner SW41 (for 1¼" UNC external thread) .| 43 |

5.3 Connecting the water supply

DANGER Risk of injury due to electric shock. Î Protect the machine against splashing water. When inserting and removing the water hose, ensure that no water penetrates the air slits of the machine. Use intact Gardena couplings and Gardena hose lengths only. Check the sealing rings for wear or damage. The drill may not be run with leaking hose couplings.

Connect the water supply (1) with the coupling (3) to a hose with a Gardena hose connector (½ inch).

The water supply can be switched on and off and finely controlled using the tap (1).

• Set the water flow rate as low as possible to avoid the risk of splashing/spraying.

5.4 Installing the drill stand with

Use the diamond core drill bit to align the drill stand with the hole to be drilled:

Mark the anchor hole for fixing the drill stand plate (5) through the mounting slot and drill (drill hole: Ø 15 mm, depth 50 mm).

Insert the retaining screw (1) with attached quick-action plug (2) in the plug hole.

Align the drill stand plate (5) with the help of the spirit level (6) or a builder’s level (for BST 420) and the four adjustable feet (4).

Screw in the retaining screw (3) with the help of the spike (2).

Tighten the quick-action nut (1) with light hammer blows.

Tighten the wet diamond core drill bit (3) using an open-end spanner SW24 (for ½" inter- nal thread). NOTE Check the fit and condition of the wet diamond core drill bit. A damaged wet diamond core drill bit may not be used and must be replaced immediately.

5.2 Fixing the drive unit to the drill

stand NOTE Ensure that the drill stand is securely in position and stable!

Use the 4 retaining screws (3) to screw the drive unit (1) onto the bolt-on plate (2).

• The spindle head must lock.

Unscrew the tapered shaft (5) and pull it out of the spindle head (4) up to the limit stop.

Hook the bolt-on plate (2) with the drive unit (1) from above into the holder of the spindle head (3) and push the bolt-on plate (2) towards the rear.

Push the tapered shaft (5) through the bolt- on plate (2) and tighten using an open-ended spanner. NOTE Never use the feed crank handle to tighten the tapered shaft; it could be damaged by excessive torque.| 44 |

NOTE Use RAWL anchors with diameter 20 mm / M12 for fixing onto walls.

If fixing onto the wall, an external spirit level must be used to adjust the perpendicularity of the drill stand with the drillhole of the diamond drill core bit. This adjustment cannot be made using the integrat- ed spirit level (7) on the drill stand.

5.5 Installing the drill stand with

vacuum kit (accessory) If it not possible to fix the drill stand with the plug fix- ing, the drill stand can be fixed onto the floor using a vacuum kit (Id No. 73312). The installation is described in the corresponding installation instructions for the vacuum kit.

5.6 Drill stand ceiling brace

The drill stand can be additionally fixed to the ceiling by using an optionally available quick-action pillar (see BAIER catalogue). NOTE The ceiling must be checked beforehand to ensure it can withstand a large compressive point load. Secure the quick-action pillar against falling or loosening due to vibration.

5.7 Adjusting the tilt at the drill

stand BST 250 The drill stand can be continuously adjusted up to a tilt of 45°.

Undo the top cheese head screw (3) and the two bottom cheese head screws (2) of the angle adjustment, it may be necessary to hold the nuts on the opposite side to prevent them from moving.

Set the drill stand column (1) to the required drilling angle.

Re-tighten the two bottom cheese head screws (2) and the top cheese head screw (3). NOTE

The drill stand may not be used again until all three cheese head screws (2 and 3) have been screwed tight. BST 420 The drill stand can be continuously adjusted up to a maximum tilt of 55°. The procedure for adjusting the tilt is described in the operating instructions enclosed with the drill stand.

5.8 Switching on the drive unit and

• Before starting up the drive unit, check all the points described in the “Before starting work” chapter (see page 41 ff.).

• Select the core drill bit and fit (see “Fitting or changing the wet diamond core drill bit” on page 42). NOTE Changing gear while the machine is running can cause damage to the drill. Wait for the machine to completely stop.

• Set the appropriate speed for the core drill bit diameter (see “Technical specifications” on page 38) at the gear change knob (BDB 835: Item 4, see Figure

and BDB 8325: Item 4, see Figure

WARNING Risk of injury due to falling drill cores. Î If drilling openings through objects, always check the rooms below or behind and block off the danger zone. Use formwork to secure the drill core against falling.

Switch on the drive unit at the ON/OFF switch (BDB 835: Item 8 see Figure

and BDB 8325: Item 8, see Figure

) and wait until the working speed is reached – green LED (BDB 835: Item 6, see Figure

and BDB 8325: Item 6, see Figure

Open water supply (1) slightly.

• Set water suction to continuous operation. NOTE If the wet drilling system is operated without water extraction, you must ensure that the escaping cooling water is collected and does not cause any damage.

• Release the spindle head – if locked:

BST 250 Release the clamping lever (1); the spindle head (2) is now freely movable once again.

BST 420 Pull the locking pin (2) in the spindle head (1) out of the feed shaft, turn through 90° and allow it to latch into position. To do this, it may be necessary to move the spindle head (1) up or down slightly using the feed crank handle. The spindle head (1) is once again freely movable.

Turn the capstan handle (5) in a clockwise direction to slowly immerse the diamond core drill bit into the material to be drilled – the green LED (BDB 835: Item 6, see Figure

and BDB 8325: Item 6, see Figure

• As soon as the diamond drill bit has visibly immersed in the drilled material the feed can be increased. NOTE The diamond core drill bit can become blunt or damaged due to overheating. The feed may only be as high as the diamond core drill bit can wear away the material. Therefore, do not exert too much pressure on the diamond core drill bit (see “Handling wet diamond core drill bits” on page 46).

• If the feed is too fast, the red LED (BDB 835: Item 7, see Figure

and BDB 8325: Item 7, see Figure

) lights up. Then, immediately reduce the feed until the green LED (BDB 835: Item 6, see Figure

and BDB 8325: Item 6, see Figure

) lights up again. If this warning signal is ignored, i.e. the feed is not reduced, the electronics switch off the drive unit on overload. The drilling process can then be started and continued as described above. NOTE The drive unit also switches off if the wet diamond core drill bit has insufficient cutting power. In this case, check whether the diamond core drill bit has become blunt (see “Handling wet diamond core drill bits” on page 46).

5.9 Ending the drilling process

• After drilling, allow the water to continue running for a short time to flush out the drilling sludge between the wet diamond core drill bit and the drill core.

Turn the capstan handle (5) counter-clock- wise to pull the wet diamond core drill bit slowly out of the drillhole.

Switch off the drive unit at the ON/OFF switch (BDB 835: Item 8 see Figure

and BDB 8325: Item 8, see Figure

Turn off the water supply (1) at the tap (2).

• Switch off the water suction. Through-hole NOTE Risk of deformation or fracture! Do not hit the diamond drill bit with hard objects! If the drill core is stuck in the diamond core drill bit, knock the diamond core drill bit with a soft piece of wood or plastic to loosen the drill core. Non through-hole (blind hole) NOTE The diamond core drill bit can be damaged irrepa- rably if it is jammed in the core drill hole. Never use the diamond core drill bit to break out the drill core!

If the drill core is still stuck in the drill hole after the diamond core drill bit has been removed, it can be broken out using a suitable tool (e.g. chisel).| 46 |

6 Cleaning DANGER Risk of injury due to electric shock. Î Disconnect the mains plug before carrying out any work on the drive unit. The machine must be cleaned after each drilling work session.

• If necessary, remove the diamond drill from the drill stand.

• Carefully clean the machine and blow out with compressed air.

• Lightly grease the thread of the wet core drill bit holder.

• Clean the drill stand carefully and blow out with compressed air. f Lightly grease the spindle head guide.

• Empty the rotary swivel of the water suction, blow out and lightly oil the thread.

• Ensure handles are dry and free from grease. 7 Maintenance DANGER Risk of injury due to electric shock. Î Disconnect the mains plug before carrying out any work on the drive unit. The drive unit must be serviced at least once a year. Further, servicing will be necessary depending on the wear of the carbon brushes. NOTE When using new carbon brushes, the machine may only be operated within the green range for the first 15 minutes – observe LED display in cap of the drive unit (BDB 835: Item 6, see Figure

and BDB 8325: Item 6, see Figure

Only servicing and repair firms authorised by Maschinenfabrik OTTO BAIER GmbH may carry out maintenance of the machine. Ensure that original BAIER spare parts and original BAIER accessories only are used (see BAIER catalogue). 8 Handling wet diamond core drill bits

Always use and store wet diamond core drill bits in accordance with the manufacturer's instructions.

• Too soft diamond segments: f Wet diamond core drill bits wear too quickly at very high removal rate. Remedy: The material to be machined requires wet diamond core drill bits with a harder bond.

• Too hard diamond segments: f The diamond grains become blunt and do not break out of the bond. The wet diamond core drill bits no longer have any cutting power. Remedy: The material to be machined requires wet diamond core drill bits with a softer bond.

• If water flushing is not used during machining, the wet diamond core drill bit increasingly rubs against "soft" drill dust. The core drill bit segments heat as a result, they become soft and the diamond splinters sink into the substrate. The wet diamond core drill bit becomes less sharp. The cutting performance weakens and the user increases the pressure on the wet diamond core drill bit, which in turn increases the effect. After drilling a few holes, the wet core drill bit segments are "glazed" or they tear off at the least resistance in the stone and the wet diamond core drill bit must be replaced.

• Sharpening the wet diamond core drill bit using the BAIER professional whetstone (ID No. 15453) or a soft stone between drilling enables sunken in diamonds to be re-released and the wet diamond core drill bit is sharp again.

• Water cooling of the core drill bit segments is necessary to extend the life of the wet diamond core drill bit and to keep the cutting speed high.| 47 |

• Excessive drilling pressure can cause material fatigue in the base metal and therefore the for- mation of cracks. Before use, ensure that there are no cracks in the wet diamond core drill bit.

• The wet diamond core drill bit should plunge into the wall only after the working speed has been reached – green LED lights up (BDB 835: Item 6, see Figure

and BDB 8325: Item 6, see Figure

10 Scope of Supply Please refer to the enclosed delivery note for the individual scope of supply of a customer-specific order. Please refer to the table below for the scope of supply of basic models. Please contact your dealer if parts are missing or damaged. ID No. Drive unit Drill stand BDB 835 BDB 835 wet drilling system 67330 x x (BST 420) BDB 835 drive unit 64030 x BDB 8325 BDB 8325 wet drilling system 6267 x x (BST 250) BDB 8325 drive unit 76497 x x included in scope of supply 9 Disposal Recycle the machine and its packaging in an environmentally friendly way in accordance with the provisions applicable in your country.| 48 |

11 Warranty The power tools placed on the market and distrib- uted by Maschinenfabrik OTTO BAIER GmbH take into account the regulations of the laws concerning engineering tools and equipment to protect against risks to health and safety. We guarantee the perfect quality of our products and accept the costs of subsequent repairs by replacing the damaged parts or replacement with a new tool in case of design, material and/or manufacturing errors within the warranty period. The warranty period for commercial use is 12 months. The following are prerequisite for a warranty claim due to design, material and/or manufacturing errors:

1. Proof of purchase and compliance with the

instruction manual A mechanically produced original copy of a purchase voucher must always be submitted in order to make a warranty claim. It must contain the complete address, date of purchase and type designation of the product. The instruction manual for the respective machine and the safety instructions must have been complied with. Damage due to faulty operation cannot be recognised as a warranty claim.

2. Correct deployment of the machine

Maschinenfabrik OTTO BAIER GmbH’s prod- ucts are developed and produced for specific purposes. A warranty claim cannot be acknowledged in the event of failure to comply with the intended use in accordance with the instruction manual, misuse or use for another purpose or use of unsuitable accessories. The warranty does not apply if the machine is deployed in continuous and piece-work operation or for rental and hire purposes.

3. Compliance with servicing intervals

Regular servicing by us or a servicing and repair firm authorised by us is prerequisite for warranty claims. Servicing is specified for when the carbon brushes are worn, however at least once a year. The machine must be cleaned in accordance with the provisions of the instruction manual. All warranty entitlements expire in case of interven- tion/tampering with the machine by third parties (opening the machine). Servicing and cleaning work are not generally covered by the warranty.

4. Use of original BAIER spare parts

Ensure that original BAIER spare parts and BAIER accessories only are used. They are available from authorised dealers. The type and quantity of grease are to be used according to the valid grease list. Use of non-original parts can cause consequential damage to the machine and an increased risk of accidents. Dismantled, partly dismantled machines and machines repaired with third party spare parts are excluded from the warranty.

Certain components are subject to use-induced wear or normal wear and tear caused by use of the respective power tool. These components include, among other things, carbon brushes, ball bearings, switches, power cords, seals, shaft sealing rings. Wearing parts are not covered by the warranty.| 49 | 1 Informazioni su questo manuale di istruzioni per l'uso ................................................ 2