GWS 850 C Professional - Coffee grinder BOSCH - Free user manual and instructions

Product Type	Angle Grinder
Brand	Bosch
Model	GWS 850 C Professional
Max. grinding wheel diameter	125 mm
Weight (according to EPTA 01:2014)	1.9 kg
Rated power input	850 W
Rated power output	490 W
Rated speed	11 000 rpm
Speed adjustment	No (fixed speed)
Spindle thread	M14
Max. spindle thread length	22 mm
Protection class	II (double insulation)
Inrush current limitation	Yes (allows use on 16 A fuse)
Constant-Electronic	Yes (maintains speed under load)
Main functions	Grinding, cutting, brushing, sanding (with appropriate accessories)
Maintenance and cleaning	Clean ventilation slots regularly; use a suitable vacuum for dust
Safety	Adjustable protective guard, extra handle, spindle lock, quick stop
Spare parts and repairability	Bosch after-sales service; parts available through authorized network
Power supply	230 V (220 V compatible), 50/60 Hz

Frequently Asked Questions - GWS 850 C Professional BOSCH

How to change the grinding disc?

Unplug the tool. Press the spindle lock (1) to lock the shaft. Loosen the clamping nut (12) with the combination wrench (5/6). Replace the grinding wheel, then tighten the nut firmly.

What is the maximum rotational speed?

The rated speed is 11,000 rpm. For the discs used, ensure that their permissible speed (indicated on the disc) is at least equal.

Can I use this grinder to cut metal?

Yes, with the cutting guard (15) and a suitable cutting disc. Always use the specific guard and work at moderate speed.

How to adjust the protective guard?

Loosen the clamping screw (9) with the combination wrench. Turn the guard (8) to the desired position, then retighten the screw. Make sure the guard adequately protects the user from sparks.

Does the grinder have inrush current limitation?

Yes, the electronic inrush current limitation allows operation on a 16 A fuse without nuisance tripping.

What types of accessories are compatible?

125 mm grinding wheels, cutting discs, sanding pads, cup brushes, flap discs. Use only accessories with M14 bore and permissible speed >= 11,000 rpm.

How to clean the tool?

Unplug the tool. Regularly clean the ventilation slots with compressed air. For metallic dust, use a suitable vacuum to avoid short circuits.

What to do in case of wheel blockage?

Release the switch immediately. Hold the tool firmly until the wheel comes to a complete stop. Do not attempt to remove the wheel while it is rotating. Identify and correct the cause of the blockage before restarting.

Is the Constant-Electronic useful?

Yes, the Constant-Electronic maintains a nearly constant speed even under load, which improves work quality and avoids jolts.

Where to find spare parts or after-sales service?

Visit the website www.bosch-pt.com for exploded views and parts. Contact an authorized Bosch after-sales service (addresses in the manual). For repairs, entrust the tool to a qualified professional.

USER MANUAL GWS 850 C Professional BOSCH

Robert Bosch Power Tools GmbH

70538 Stuttgart

GERMANY

www.bosch-pt.com

160992A2V812016.11098

1609 92A 2V8

GWS Professional HEAVY DUTY

8-100C|8-100CE|8-125C|8-125CE|850C|850CE

1

2

1

0512

BOSCH

Original Instructions

CD Original Instruction Manual

TW Original Instruction Manual

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TH

General Power Tool Safety Warnings

WARNING: Read all safety warnings and all instructions. Failure to follow the warnings and

instructions may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

Work area safety

• Keep work area clean and well lit. Cluttered or dark areas invite accidents. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
• Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock. Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded. Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock. Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges and moving parts. Damaged or entangled cords increase the risk of electric shock. When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock. If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.

Personal safety

Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury. Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.

Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energising power tools that have the switch on invites accidents. Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury. Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations. Dress properly. Do not wear loose clothing or jewellery. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts. If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.

Power tool use and care

Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed. Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired. Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally. Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users. Maintain power tools. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool's operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools. Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control. Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.

Service

Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

Safety Warnings for Angle Grinder

Safety Warnings common for Grinding, Sanding, Wire Brushing or Abrasive Cutting Off Operations

This power tool is intended to function as a grinder, sander, wire brush, or cut-off tool. Read all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury. Operations such as polishing are not recommended to be performed with this power tool. Operations for which the power tool was not designed may create a hazard and cause personal injury. Do not use accessories that are not specifically designed and recommended by the tool manufacturer. Just because the accessory can be attached to your power tool, it does not assure safe operation. The rated speed of the accessory must be at least equal to the maximum speed marked on the power tool. Accessories running faster than their rated speed can break and fly apart. The outside diameter and the thickness of your accessory must be within the capacity rating of your power tool. Incorrectly sized accessories cannot be adequately guarded or controlled. Threaded mounting of accessories must match the grinder spindle thread. For accessories mounted by flanges, the arbor hole of the accessory must fit the locating diameter of the flange. Accessories that do not match the mounting hardware of the power tool will run out of balance, vibrate excessively, and may cause loss of control. Do not use a damaged accessory. Before each use, inspect the accessory such as abrasive wheels for chips and cracks, backing pad for cracks, tear, or excess wear, wire brush for loose or cracked wires. If the power tool or accessory is dropped, inspect for damage or install an undamaged accessory. After inspecting and installing an accessory, position yourself and bystanders away from the plane of the rotating accessory and run the power tool at maximum no-load speed for one minute. Damaged accessories will normally break apart during this test time. Wear personal protective equipment. Depending on application, use face shield, safety goggles, or safety glasses. As appropriate, wear dust mask, hearing protectors, gloves, and workshop apron capable of stopping small abrasive or workpiece fragments. The eye protection must be capable of stopping flying debris generated by various operations. The dust mask or respirator must be capable of filtrating particles generated by your operation. Prolonged exposure to high intensity noise may cause hearing loss. Keep bystanders a safe distance away from the work area. Anyone entering the work area must wear personal protective equipment. Fragments of workpiece or of a broken accessory may fly away and cause injury beyond the immediate area of operation.

Hold the power tool by insulated gripping surfaces only, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock. Position the cord clear of the spinning accessory. If you lose control, the cord may be cut or snagged and your hand or arm may be pulled into the spinning wheel. Never lay the power tool down until the accessory has come to a complete stop. The spinning wheel may grab the surface and pull the power tool out of your control. Do not run the power tool while carrying it at your side. Accidental contact with the spinning accessory could snag your clothing, pulling the accessory into your body. Regularly clean the power tool's air vents. The motor's fan will draw the dust inside the housing and excessive accumulation of powdered metal may cause electrical hazards. Do not operate the power tool near flammable materials. Sparks could ignite these materials. Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock.

Kickback and related warnings

• Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing pad, brush or any other accessory. Pinching or snagging causes rapid stalling of the rotating accessory which in turn causes the uncontrolled power tool to be forced in the direction opposite of the accessory's rotation at the point of the binding. For example, if an abrasive wheel is snagged or pinched by the workpiece, the edge of the wheel that is entering into the pinch point can dig into the surface of the material causing the wheel to climb out or kick out. The wheel may either jump toward or away from the operator, depending on direction of the wheel's movement at the point of pinching. Abrasive wheels may also break under these conditions. Kickback is the result of power tool misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below.
• Maintain a firm grip on the power tool and position your body and arm to allow you to resist kickback forces. Always use auxiliary handle, if provided, for maximum control over kickback or torque reaction during start-up. The operator can control torque reactions or kickback forces, if proper precautions are taken. Never place your hand near the rotating accessory. Accessory may kickback over your hand. Do not position your body in the area where power tool will move if kickback occurs. Kickback will propel the tool in direction opposite to the wheel's movement at the point of snagging. Use special care when working corners, sharp edges, etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing have a tendency to snag the rotating accessory and cause loss of control or kickback.

Do not attach a saw chain woodcarving blade or toothed saw blade. Such blades create frequent kickback and loss of control.

Safety warnings specific for Grinding and Abrasive Cutting-Off operations

Use only wheel types that are recommended for your power tool and the specific guard designed for the selected wheel. Wheels for which the power tool was not designed cannot be adequately guarded and are unsafe. The grinding surface of the centre depressed wheels must be mounted below the plane of the guard lip. An improperly mounted wheel that projects through the plane of the guard lip cannot be adequately protected. The guard must be securely attached to the power tool and positioned for maximum safety, so the least amount of wheel is exposed towards the operator. The guard helps to protect operator from broken wheel fragments, accidental contact with wheel and sparks that could ignite clothing. Wheels must be used only for recommended applications. For example: do not grind with the side of the cut-off wheel. Abrasive cut-off wheels are intended for peripheral grinding; side forces applied to these wheels may cause them to shatter. Always use undamaged wheel flanges that are of correct size and shape for your selected wheel. Proper wheel flanges support the wheel thus reducing the possibility of wheel breakage. Flanges for cut-off wheels may be different from grinding wheel flanges. Do not use worn down reinforced wheels from larger power tools. Wheels intended for larger power tools are not suitable for the higher speed of a smaller tool and may burst.

Additional safety warnings specific for abrasive cutting off operations

Do not "jam" the cut-off wheel or apply excessive pressure. Do not attempt to make an excessive depth of cut. Overstressing the wheel increases the loading and susceptibility to twisting or binding of the wheel in the cut and the possibility of kickback or wheel breakage. Do not position your body in line with and behind the rotating wheel. When the wheel, at the point of operation, is moving away from your body, the possible kickback may propel the spinning wheel and the power tool directly at you. When wheel is binding or when interrupting a cut for any reason, switch off the power tool and hold the power tool motionless until the wheel comes to a complete stop. Never attempt to remove the cut-off wheel from the cut while the wheel is in motion otherwise kickback may occur. Investigate and take corrective action to eliminate the cause of wheel binding. Do not restart the cutting operation in the workpiece. Let the wheel reach full speed and carefully re-enter the cut. The wheel may bind, walk up or kickback if the power tool is restarted in the workpiece.

Support panels or any oversized workpiece to minimize the risk of wheel pinching and kickback. Large workpieces tend to sag under their own weight. Supports must be placed under the workpiece near the line of cut and near the edge of the workpiece on both sides of the wheel. Use extra caution when making a "pocket cut" into existing walls or other blind areas. The protruding wheel may cut gas or water pipes, electrical wiring or objects that can cause kickback.

Safety warnings specific for sanding operations

Do not use excessively oversized sanding disc paper. Follow manufacturers recommendations, when selecting sanding paper. Larger sanding paper extending beyond the sanding pad presents a laceration hazard and may cause snagging, tearing of the disc, or kickback.

Safety warnings specific for wire brushing operations

Be aware that wire bristles are thrown by the brush even during ordinary operation. Do not overstress the wires by applying excessive load to the brush. The wire bristles can easily penetrate light clothing and/or skin. If the use of a guard is recommended for wire brushing, do not allow any interference of the wire wheel or brush with the guard. Wire wheel or brush may expand in diameter due to work load and centrifugal forces.

Additional safety warnings

Wear safety goggles.

Use suitable detectors to determine if utility lines are hidden in the work area or call the local utility company for assistance. Contact with electric lines can lead to fire and electric shock. Damaging a gas line can lead to explosion. Penetrating a water line causes property damage or may cause an electric shock. Release the On/Off switch and set it to the off position when the power supply is interrupted, e.g., in case of a power failure or when the mains plug is pulled. This prevents uncontrolled restarting. Secure the workpiece. A workpiece clamped with clamping devices or in a vice is held more secure than by hand. - Products sold in GB only: Your product is fitted with a BS 1363/A approved electric plug with internal fuse (ASTA approved to BS 1362). If the plug is not suitable for your socket outlets, it should be cut off and an appropriate plug fitted in its place by an authorised customer service agent. The replacement plug should have the same fuse rating as the original plug. The severed plug must be disposed of to avoid a possible shock hazard and should never be inserted into a mains socket elsewhere.

Products sold in AUS and NZ only: Use a residual current device (RCD) with a rated residual current of 30 mA or less.

Product Description and Specifications

Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.

Intended Use

The machine is intended for cutting, roughing and brushing of metal and stone materials without the use of water. For cutting with bonded abrasives, a special cutting guard (accessory) must be used.

When cutting in stone, provide for sufficient dust extraction. With approved sanding tools, the machine can be used for sanding with sanding discs.

Product Features

The numbering of the product features refers to the illustration of the machine on the graphics page.

1 Spindle lock button 2 On/Off switch 3 Thumbwheel for speed preselection (GWS 8-100 CE/GWS 8-125 CE/GWS 850 CE) 4 Auxiliary handle (insulated gripping surface)

5 Combination spanner for M 14 grinder spindle 6 Combination spanner for M 10 grinder spindle 7 Grinder spindle 8 Protection guard for grinding 9 Locking screw for protection guard

10 Mounting flange with O-ring

11 Grinding wheel 12 Clamping nut 13 Quick-clamping nut SDS-cie 14 Carbide grinding head 15 Protection guard for cutting 16 Cutting disc 17 Hand guard 18 Rubber sanding plate 19 Sanding sheet 20 Round nut* 21 Cup brush 22 Cutting guide with dust extraction protection guard * 23 Diamond cutting disc 24 Handle (insulated gripping surface)

*Accessories shown or described are not part of the standard delivery scope of the product. A complete overview of accessories can be found in our accessories program.

Technical Data

Angle Grinding GWS...	8-100 C 8-100 CE 8-125 C
	Professional
Article number 0 601 ... 377 ... 378 ... 377 ...
Rated power input	W 850 850 850
Output power	W 490 490 490
Rated speed	min-1	11000	11000 11000
Speed control adjustment	min-1	-	2800
		-	11000
Grinding disc diameter, max. mm 100 100 125
Thread of grinder spindle		M 10 M 10 M 14
Thread length (max.) of grinder spindle	mm	17	17
Reduced starting current		●	●
Constant electronic control		●	●
Speed preselection		-	●
Weight according to EPTA-Procedure 01:2014	kg	1.8	1.8
Protection class		☐/II	☐/II
Angle Grinding GWS...	8-125 CE		850 C
	Professional
Article number	0 601 ... 378 ...	377 7..	378 7..
		377 9..	378 9..
Rated power input	W 850 850 850
Output power	W 490 490 490
Rated speed	min-1	11000	11000 11000
The values given are valid for a nominal voltage [U] of 230 V. For different voltages and models for specific countries, these values can vary.

Angle Grinder	GWS... Professional	8-125 CE	850 C	850 CE
Speed control adjustment	min-1	2800	-	2
		- 11000		- 11000
Grinding disc diameter, max. mm 125 125 125
Thread of grinder spindle		M 14 M 14 M 14
Thread length (max.) of grinder spindle	mm 22 22 22
Reduced starting current		● ●	●
Constant electronic control		● ●	●
Speed preselection		● - ●
Weight according to EPTA-Procedure 01:2014	kg	1.9	1.9	1.9
Protection class		☐/II /II /II ☑		☐
The values given are valid for a nominal voltage [U] of 230 V. For different voltages and models for specific countries, these values can vary.

Assembly

Mounting the Protective Devices

Before any work on the machine itself, pull the mains plug.

Note: After breakage of the grinding disc during operation or damage to the holding fixtures on the protection guard/power tool, the machine must promptly be sent to an after-sales service agent for maintenance. For addresses, see section "After-sales Service and Application Service".

Protection Guard for Grinding

Place the protection guard 8 on the spindle collar. Adapt the position of the protection guard 8 to the requirements of the work step. Lock protection guard 8 by tightening locking screw 9 with combination spanner 5/6.

Adjust the protection guard 8 in such a manner that sparking is prevented in the direction of the operator.

Note: The encoding keys on the protection guard 8 ensure that only a protection guard that fits the machine type can be mounted.

Protection Guard for Cutting

For cutting with bonded abrasives, always use the protection guard for cutting 15. Provide for sufficient dust extraction when cutting stone.

The protection guard for cutting 15 is mounted in the same manner as the protection guard for grinding 8.

Cutting Guide with Dust Extraction Protection Guard

The cutting guide with dust extraction protection guard 22 is mounted in the same manner as the protection guard for grinding 8.

Auxiliary Handle

Operate your machine only with the auxiliary handle 4.

Screw the auxiliary handle 4 on the right or left of the machine head depending on the working method.

Hand Guard

For operations with the rubber sanding plate 18 or with the cup brush/wheel brush/flap disc, always mount the hand guard 17.

The hand guard 17 is fastened with the auxiliary handle 4.

Mounting the Grinding Tools

Before any work on the machine itself, pull the mains plug. Do not touch grinding and cutting discs before they have cooled down. The discs can become very hot while working.

Clean the grinder spindle 7 and all parts to be mounted.

For clamping and loosening the grinding tools, lock the grinder spindle with the spindle lock button 1. - Actuate the spindle lock button only when the grinder spindle is at a standstill. Otherwise, the machine may become damaged.

Grinding/Cutting Disc

Pay attention to the dimensions of the grinding tools. The mounting hole diameter must fit the mounting flange without play. Do not use reducers or adapters.

When using diamond cutting discs, pay attention that the direction-of-rotation arrow on the diamond cutting disc and the direction of rotation of the machine (see direction-of-rotation arrow on the machine head) agree.

See graphics page for the mounting sequence. To fasten the grinding/cutting disc, screw on the clamping nut 12 and tighten it with the combination spanner 5/6, (see section "Quick-clamping Nut"). After mounting the grinding tool and before switching on, check that the grinding tool is correctly mounted and that it can turn freely. Make sure that the grinding tool does not graze against the protection guard or other parts.

Mounting flange for grinding spindle M 14: A plastic part (O-ring) is fitted around the centring collar of mounting flange 10. If the O-ring is missing or damaged, the mounting flange 10 must be replaced before resuming operation.

Mounting flange for grinding spindle M 10: The mounting flange can be used on both sides.

Flap Disc

For operations with the flap disc, always mount the hand guard 17.

Rubber Sanding Plate

For operations with the rubber sanding plate 18, always mount the hand guard 17.

See graphics page for the mounting sequence.

Screw on round nut 20 and tighten it with the combination spanner 5/6.

Cup Brush/Disc Brush

For operations with the cup brush/wheel brush, always mount the hand guard 17.

See graphics page for the mounting sequence.

The cup brush/disc brush must be able to be screwed onto the grinder spindle until it rests firmly against the grinder spindle flange at the end of the grinder spindle threads. Tighten the cup brush/disc brush with an open-end spanner.

Quick-clamping Nut SDS-e/ie

For convenient changing of grinding tools without the use of additional tools, you can use the quick-clamping nut 13 instead of the clamping nut 12.

The quick-clamping nut 13 may be used only for grinding or cutting discs.

Use only a flawless, undamaged quick-clamping nut 13.

When screwing on, pay attention that the side of the quick-clamping nut 13 with printing does not face the grinding disc; the arrow must point to the index mark 25.

Lock the grinder spindle with the spindle lock button 1. To tighten the quick-clamping nut, firmly turn the grinding disc in clockwise direction.

A properly fastened, undamaged quick-clamping nut can be manually loosened by turning the knurled ring in anticlockwise direction.

Never loosen a tight quick-clamping nut using pliers; always use the combination spanner. Apply the combination spanner 5/6 as shown in the figure.

Approved Grinding Tools

All grinding tools mentioned in these operating instructions can be used.

The permissible speed [min^-1] or the circumferential speed [m/s] of the grinding tools used must at least match the values given in the table.

Therefore, observe the permissible rotational/circumferential speed on the label of the grinding tool.

	max. [mm] D bd [min]		[mm] -1] [m/s]
b D	100	6	16.0	11000 80
	115	6	22.2	11000 80
	125	6	22.2	11000 80
D	100	-	-	11000 80
	115	-	-	11000 80
	125	-	-	11000 80
b D	70	30	M 10	11000 45
	75	30	M 14	11000 45

Rotating the Machine Head

Before any work on the machine itself, pull the mains plug.

The machine head can be rotated with respect to the machine housing in 90° steps. In this manner, the On/Off switch can be brought into a more convenient position for special working situations, e.g. for left-handed persons.

Completely unscrew the four screws. Rotate the machine head carefully,

without removing it from the housing, to the new position. Screw in and tighten the four screws again.

Dust/Chip Extraction

Dust from materials such as lead-containing coatings, some wood types, minerals and metal can be harmful to one's health. Touching or breathing-in the dust can cause allergic reactions and/or lead to respiratory infections of the user or bystanders.

Certain dust, such as oak or beech dust, is considered carcinogenic, especially in connection with wood-treatment additives (chromate, wood preservative). Materials containing asbestos may only be worked by specialists.

- As far as possible, use a dust extraction system suitable for the material. - Provide for good ventilation of the working place. - It is recommended to wear a P2 filter-class respirator. Observe the relevant regulations in your country for the materials to be worked.

Prevent dust accumulation at the workplace. Dust can easily ignite.

Operation

Starting Operation

Observe correct mains voltage! The voltage of the power source must agree with the voltage specified on the nameplate of the machine. Power tools marked with 230 V can also be operated with 220 V. Hold power tool by insulated gripping surfaces 24 and auxiliary handle 4 only. The accessory may contact hidden wiring or its own cord. Accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and shock the operator.

When operating the machine with power from mobile generators that do not have sufficient reserve capacity or are not equipped with suitable voltage control with starting current amplification, loss of performance or untypical behavior can occur upon switching on.

Please observe the suitability of the power generator being used, particularly with regard to the mains voltage and frequency.

Switching On and Off

To start the power tool, push the On/Off switch 2 forwards. To lock the On/Off switch 2, press the On/Off switch 2 down at the front until it latches.

To switch off the power tool, release the On/Off switch 2 or, if it is locked, briefly push down the back of the On/Off switch 2 and then release it.

To save energy, only switch the power tool on when using it.

Check grinding tools before using. The grinding tool must be mounted properly and be able to move freely. Carry out a test run for at least one minute with no load. Do not use damaged, out-of-centre or vibrating grinding tools. Damaged grinding tools can burst and cause injuries.

Reduced starting current

The electronic reduced starting current limits the power consumption when switching the tool on and enables operation from a 13 ampere fuse.

Constant Electronic Control

Constant electronic control holds the speed constant at no-load and under load, and ensures uniform working performance.

Speed preselection (GWS 8-100 CE/GWS 8-125 CE/GWS 850 CE)

The required speed can be preselected with the thumbwheel 3 (also while running).

The data in the following table are recommended values.

Material Application Accessory Thumbwheel Position
Metal Removing paint Sanding disc 2 - 3
Wood, metal Brushing, rust removal Cup brush, sanding disc 3
Metal, masonry	Grinding	Grinding disc	4 - 6
Metal Rough grinding		Grinding disc	6
Masonry, stone	Cutting	Cutting disc and cutting guide	6
		(Cutting masonry/stone is permitted only with use of the cutting guide)
Working Advice
• Exercise caution when cutting slots in structural walls; see Section "Information on Structures". • Clamp the workpiece if it does not remain stationary due to its own weight. • Do not strain the machine so heavily that it comes to a standstill. • After heavily straining the power tool, continue to run it at no-load for several minutes to cool down the accessory.	Do not touch grinding and cutting discs before they have cooled down. The discs can become very hot while working. Do not use the power tool with a cut-off stand. Rough Grinding Never use a cutting disc for roughing. The best roughing results are achieved when setting the machine at an angle of 30° to 40°. Move the machine back and forth with moderate pressure. In this manner, the workpiece will not become too hot, does not discolour and no grooves are formed.

Flap Disc

With the flap disc (accessory), curved surfaces and profiles can be worked.

Flap discs have a considerably higher service life, lower noise levels and lower sanding temperatures than conventional sanding sheets.

Cutting Metal

For cutting with bonded abrasives, always use the protection guard for cutting 15.

When cutting, work with moderate feed, adapted to the material being cut. Do not exert pressure onto the cutting disc, tilt or oscillate the machine.

Do not reduce the speed of running down cutting discs by applying sideward pressure.

The machine must always work in an upgrinding motion. Otherwise, the danger exists of it being pushed uncontrolled out of the cut.

When cutting profiles and square bar, it is best to start at the smallest cross section.

Cutting Stone

• Provide for sufficient dust extraction when cutting stone. Wear a dust respirator. The machine may be used only for dry cutting/grinding.

For cutting stone, it is best to use a diamond cutting disc. When using the cutting guide with dust extraction protection guard 22, the vacuum cleaner must be approved for vacuuming masonry dust. Suitable vacuum cleaners are available from Bosch.

Switch on the machine and place the front part of the cutting guide on the workpiece. Slide the machine with moderate feed, adapted to the material to be worked.

For cutting especially hard material, e.g., concrete with high pebble content, the diamond cutting disc can overheat and

become damaged as a result. This is clearly indicated by circular sparking, rotating with the diamond cutting disc. In this case, interrupt the cutting process and allow the diamond cutting disc to cool by running the machine for a short time at maximum speed with no load.

Noticeably decreasing work progress and circular sparking are indications of a diamond cutting disc that has become dull. Briefly cutting into abrasive material (e.g. lime-sand brick) can resharpen the disc again.

Information on Structures

Slots in structural walls are subject to the Standard DIN 1053 Part 1, or country-specific regulations.

These regulations are to be observed under all circumstances. Before beginning work, consult the responsible structural engineer, architect or the construction supervisor.

Maintenance and Service

Maintenance and Cleaning

Before any work on the machine itself, pull the mains plug. For safe and proper working, always keep the machine and ventilation slots clean. In extreme conditions, always use dust extraction as far as possible. Blow out ventilation slots frequently and install a portable residual current device (PRCD). When working metals, conductive dust can settle in the interior of the power tool. The total insulation of the power tool can be impaired.

Please store and handle the accessory(-ies) carefully. If the replacement of the supply cord is necessary, this has to be done by Bosch or an authorized Bosch service agent in order to avoid a safety hazard.

After-sales Service and Application Service

Our after-sales service responds to your questions concerning maintenance and repair of your product as well as spare parts. Exploded views and information on spare parts can also be found under:

www.bosch-pt.com

Bosch's application service team will gladly answer questions concerning our products and their accessories.

In all correspondence and spare parts orders, please always include the 10-digit article number given on the nameplate of the product.

People's Republic of China

China Mainland

Bosch Power Tools (China) Co., Ltd.

567, Bin Kang Road

Bin Jiang District 310052

Hangzhou, P.R.China

Service Hotline: [phone]

Fax: [phone]

E-Mail: [e-mail]

www.bosch-pt.com.cn

Our after-sales service responds to your questions concerning maintenance and repair of your product as well as spare parts. Exploded views and information on spare parts can also be found under:

HK and Macau Special Administrative Regions

Robert Bosch Hong Kong Co. Ltd.

21st Floor, 625 King's Road

North Point, Hong Kong

Customer Service Hotline: [phone]

Fax: [phone]

E-Mail: [e-mail]

www.bosch-pt.com.hk

Indonesia

PT Robert Bosch

Palma Tower, 10th Floor

JL RA Kartini II-S Kaveling 6 Sek II

Pondok Pinang, Kebayoran Lama

28th Floor Fort Legend Towers,

3rd Avenue corner 31st Street,

Fort Bonifacio Global City,

1634 Taguig City, Philippines

Tel.: [phone]

Fax: [phone]

[e-mail]

www.bosch-pt.com.ph

Bosch Service Center:

9725-27 Kamagong Street

San Antonio Village

Makati City, Philippines

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Malaysia

Robert Bosch Sdn. Bhd.

No.8A, Jalan 13/6

G.P.O. Box 10818

46200 Petaling Jaya

Selangor, Malaysia

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Toll-Free: 1800 880188

www.bosch-pt.com.my

Thailand

Robert Bosch Ltd.

Liberty Square Building

No.287,11 Floor

Silom Road, Bangrak

Bangkok 10500

Tel.: [phone]

Fax:[phone]

Robert Bosch Ltd., P. O. Box 2054

Bangkok 10501, Thailand

www.bosch.co.th

Bosch Service - Training Centre

La Salle Tower Ground Floor Unit No.2

10/11 La Salle Moo 16

Srinakharin Road

Bangkaew, Bang Plee

Samutprakarn 10540

Thailand

Tel.:[phone]

Fax:[phone]

Singapore

Powerwell Service Centre Ptd Ltd

65 Ubi Crescent, #06-03 Hola Centre

Singapore 408559

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Toll-Free: 1800 3338333

www.bosch-pt.com.sg

Vietnam

Robert Bosch Vietnam Co. Ltd

13th Floor, 194 Golden Building

473 Dien Bien Phu Street

Ward 25, Binh Thanh District

84 Ho Chi Minh City

Vietnam

Tel.: [phone]

Fax: [phone]

Hotline: [phone]

E-Mail: [e-mail]

www.bosch-pt.com.vn

www.baohanhbosch-pt.com.vn

Australia, New Zealand and Pacific Islands

Robert Bosch Australia Pty. Ltd.

Power Tools

Locked Bag 66

Clayton South VIC 3169

Customer Contact Center

Inside Australia:

Phone: [phone]

Fax: [phone]

Inside New Zealand:

Phone: [phone]

Fax: [phone]

Outside AU and NZ:

Phone: [phone]

www.bosch-pt.com.au

www.bosch-pt.co.nz

Egypt

Unimar

20 Markaz kadmat

Eltagmoa EL Aoul - New Cairo

Tel: [phone]

Fax: [phone]

E-Mail: [e-mail]

Chinese | 15

Ethiopia

Forever plc

Kebele 2,754, BP 4806

Addis Ababa, Ethiopia

Tel: [phone]

E-Mail: [e-mail]

Nigeria

C. Woermann Ltd.

P.O.Box 318

1. Badejo Kalesanwo Street

Matori Industrial Estate

Lagos, Nigeria

Tel: [phone]

E-Mail: [e-mail]

Republic of South Africa

Customer service

Hotline: [phone]

Gauteng - BSC Service Centre

35 Roper Street, New Centre

Johannesburg

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

KZN - BSC Service Centre

Unit E, Almar Centre

143 Crompton Street

Pinetown

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Western Cape - BSC Service Centre

Democracy Way, Prosperity Park

Milnerton

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Bosch Headquarters

Midrand, Gauteng

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Disposal

The machine, accessories and packaging should be sorted for environmental-friendly recycling.

Do not dispose of power tools into household waste!

Subject to change without notice.

Chinese

Safety Regulations

General Power Tool Safety Warnings

This chapter includes the following contents:

Mechanics and Electronics Ltd. PT/SAX-ASA

298 Bojeong-dong Giheung-gu

Yongin-si, Gyeonggi-do, 446-913

Republic of Korea

080-955-0909

mynline139

(GWS 8-100 CE/GWS 8-125 CE/GWS 850 CE)

lang	name of the country	language of origin	nationality
lang	牙签肉汤	牙签肉汤	2-3
lang, lang	山楂, 糖醋鱼汤	山楂烧鸡块, 鸡胸肉汤	3
lang, vunio	牙签肉汤	牙签肉汤	4-6
lang	牙签肉汤	牙签肉汤	6
vunio, nu	牙签肉	牙签肉汤	6

1 1

Palma Tower 10th Floor

JI. RA Kartini II-S Kaveling 6 Sek II

Pondok Pinang. Kebayoran Lama

Safety Warnings for Angle Grinder

Common safety warnings for grinding, sanding, wire brushing, or cutting-off operations

This power tool is intended to function as a grinder, sander, wire brush, or cut-off tool. Read all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury. This power tool is not recommended for polishing. Operations for which the power tool was not designed may create a hazard and cause personal injury. Do not use accessories which are not specifically designed and recommended by the tool manufacturer. Just because an accessory can be attached to your power tool, it does not assure safe operation. The rated speed of the accessory must be at least equal to the maximum speed marked on the power tool. Accessories running faster than their rated speed can fly apart. The outside diameter and thickness of your accessory must be within the capacity rating of your power tool. Incorrectly sized accessories cannot be adequately guarded or controlled. The threaded mounting of accessories must match the thread of the grinder spindle. For accessories mounted by flanges, the arbor hole of the accessory

The accessory must fit snugly onto the spindle of the power tool. Accessories that do not fit properly will run out of balance, vibrate excessively, and may cause loss of control. Do not use damaged accessories. Before each use, inspect the accessory, such as the grinding disc, for chips or cracks, the backing pad for tears or excessive wear, and the wire brush for loose or broken wires. If the power tool or accessory is dropped, inspect it for damage or install an undamaged accessory. After inspection and installation, position yourself and bystanders away from the plane of the rotating accessory and run the power tool at maximum no-load speed for one minute. Damaged accessories will normally break apart during this test. Wear personal protective equipment. Depending on the application, use a face shield, safety goggles, or safety glasses. As appropriate, wear a dust mask, hearing protectors, gloves, and workshop aprons capable of stopping small abrasive or workpiece fragments. Eye protection must be capable of stopping flying debris generated by various operations. The dust mask or respirator must be capable of filtering particles generated by your operation. Prolonged exposure to high-intensity noise can cause hearing loss. Position bystanders at a safe distance from the work area. Anyone entering the work area must wear personal protective equipment. Fragments of the workpiece or of a broken accessory may fly away and cause injury beyond the immediate area of operation. Hold the power tool by insulated gripping surfaces only, when performing an operation where the cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a "live" wire may make exposed metal parts of the power tool "live" and shock the operator. Keep the cord away from the rotating accessory. If you lose control, the cord may be cut or snagged and your hand or arm may be pulled into the spinning accessory. Never lay the power tool down until the accessory has come to a complete stop. The spinning accessory may grab the surface and pull the power tool out of your control.

60 | Vietnamese

Do not operate the power tool while carrying it at your side. Accidental contact with the spinning accessory could snag your clothing, pulling the accessory into your body. Regularly clean the power tool's air vents. The motor's fan will draw dust inside the housing and excessive accumulation of powdered metal may cause electrical hazards. Do not operate the power tool near flammable materials. Sparks could ignite these materials. Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or electric shock.

Additional safety warnings

Wear safety goggles.

Use suitable detection equipment to determine if there are any underground utility lines in the work area, or contact the local utility company for assistance. Do not touch power lines as this may cause fire and electric shock. Damaging gas lines when digging may cause explosion. Damaging water lines causes property damage or may cause electric shock. Turn the tool off and unplug it before changing accessories, for example, when power is lost or when the plug is pulled out. This prevents accidental restarting. Clamp the workpiece securely. A workpiece clamped with a clamping device or vise is more secure than when held by hand.

Dust Protection Guard for Cutting

When cutting with abrasive materials, always use the dust protection guard for cutting 15. It provides effective dust extraction when cutting stone.

The dust protection guard for cutting 15 is installed in the same way as the dust protection guard for sanding 8.

Dust Extraction Guard for Sanding

The guard for dust extraction 22 is installed in the same way as the guard for sanding 8.

Auxiliary Handle

Only operate your machine when the auxiliary handle 4 is fitted.

Screw the auxiliary handle 4 onto the left or right side of the machine head depending on the working method.

Hand Guard

For operations with rubber sanding pad 18 or with wire brush/wire wheel/flap disc, always fit the hand guard 17.

The hand guard 17 is firmly attached together with the auxiliary handle 4.

Mounting Abrasive Tools

▶ Before carrying out any work on the machine, pull the mains plug out of the socket. Do not touch the grinding disc or cutting disc until they have cooled down. The discs can become very hot during operation.

Clean the grinding spindle 7 and all parts to be mounted.

To change or remove the grinding tool, unlock the grinder spindle using the spindle lock button 1. Only operate the spindle lock when the grinder spindle has come to a complete stop. Otherwise, the machine may be damaged.

Grinding/Cutting Disc

Pay attention to the size of the grinding tool. The hole diameter of the tool to be mounted must fit tightly onto the mounting flange without any gap. Do not use reducing pieces or adapters.

When using diamond cutting discs, note the direction of rotation arrow on the diamond cutting disc and ensure it matches the direction of rotation of the machine (see the direction of rotation arrow embossed on the machine head).

See the graphics page for assembly steps.

To tighten the grinding/cutting disc, screw on the clamping nut 12 and tighten it with the two-pin spanner 5/6. (See "Clamping Nut").

After mounting the grinding tool and before switching on the machine, check that the grinding tool is mounted correctly and can rotate freely. Ensure the grinding tool does not touch the guard or other parts.

Mounting flange for grinder spindle with M 14 thread: The plastic part (O-ring) is fitted into the centering collar of the mounting flange 10. If the O-ring is worn or damaged, replace the mounting flange 10 before putting the machine back into operation.

Mounting flange for grinder spindle with M 10 thread: Both sides of the mounting flange can be used.

Flap Disc

For sanding with flap discs, always attach the side guard 17.

Rubber Sanding Pad

For sanding with rubber sanding pads 18, always attach the side guard 17.

See the graphics page for assembly steps.

Screw on the clamping nut 20 and tighten it with the two-pin spanner 5/6.

64 | Vietnamese

Wire Cup Brush / Cup Brush

To attach the wire cup brush or cup brush, always fit the protective guard 17.

See the graphics page for assembly steps.

The wire cup brush or cup brush must be screwed fully onto the thread of the grinder spindle until it sits firmly against the flange of the grinder spindle. Tighten the wire cup brush or cup brush with a two-pin spanner.

SDS-lee Quick Lock Nut

For convenient tool changes without the need for additional tools, you can use the quick lock nut 13 instead of the standard lock nut 12.

The quick lock nut 13 may only be used for grinding discs or cutting discs.

Only use the quick lock nut if it is in perfect condition and free of defects.

When screwing it on, note that the side of the quick lock nut 13 with the printed text must not face the grinding disc; the arrow must point to the symbol 25.

Lock the grinder spindle with the spindle lock button 1. To tighten the quick lock nut, turn the grinding disc clockwise firmly.

An undamaged nut that has been correctly tightened can be loosened by hand by turning the knurled ring counterclockwise.

Never loosen a tightly seated nut with pliers; always use

a pin spanner. Use the 5/6 pin spanner as shown in the figure.

Floor 10, 194 Golden Building

473 Dién Bién Phu

Phuong 25, Quan Binh Thanh

Thanh Pho Ho Chi Minh

Viet Nam

Tel.: [phone] Ext 413

Fax: [phone]

[e-mail]

www.bosch-pt.com

Thai bo

julal aclilll abioill

-06000a

[phone]:

[phone]:J<

[e-mail]:

uigj

[phone]:

[phone]:

[e-mail]

[phone]/[phone]:

[phone]:

[e-mail]

__SUPPIMER__

40

__SUPPIMER__

The power tool is intended for driving and removing screws, and for drilling in wood, metal, ceramic and plastic.

www.bosch-pt.com

The power tool is intended for driving and removing screws, and for drilling in wood, metal, ceramic and plastic. The power tool is not intended for use in wet conditions or in the presence of flammable liquids or gases.

The power tool is intended for driving and removing screws, and for drilling in wood, metal, ceramic and plastic.

The power tool is intended for driving and removing screws, and for drilling in wood, metal, ceramic and plastic. The power tool is not intended for use in wet conditions or in the presence of flammable liquids or gases.

The power tool is intended for driving and removing screws, and for drilling in wood, metal, ceramic and plastic. The power tool is not intended for use in wet conditions or in the presence of flammable liquids or gases.

33

4

The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog.

0.5 ml (5 mg) solution

• The quick brown fox jumps over the lazy dog.

The

-15 g/dm3

• The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog. 2.1 s

1.5 s

The quick brown fox jumps over the lazy dog.

The quick brown fox jumps over the lazy dog.

*0.5 ml solution