GWS 10-450 P Professional - Grinder BOSCH - Free user manual and instructions
Find the device manual for free GWS 10-450 P Professional BOSCH in PDF.
| Product type | Angle grinder |
| Brand | Bosch |
| Model | GWS 10-450 P Professional |
| Category | Grinder (angle grinder) |
| Power | 1000 W |
| Supply voltage | 230 V |
| Frequency | 50/60 Hz |
| No-load speed | 11,000 rpm |
| Max. wheel diameter (type 27) | 115 mm (4 1/2 in) |
| Max. cutting disc diameter (type 27A/42) | 115 mm (4 1/2 in) |
| Spindle thread | 5/8 in - 11 UNC |
| Switch type | Paddle switch with lock |
| Cable length | 2.5 m (approx.) |
| Weight | 3.5 kg (approx.) |
| Dimensions (L x W x H) | 300 x 100 x 150 mm (approx.) |
| Main applications | Grinding, sanding, wire brushing, cutting |
| Safety | Double insulation, wheel guard, quick stop |
| Dust extraction system | Optional (dedicated accessory) |
| Warranty | 1 year (manufacturer) |
| Maintenance | Cleaning of air vents, brush replacement every 2 to 6 months |
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USER MANUAL GWS 10-450 P Professional BOSCH
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Icon of a person reading a book inside a circle (no text or symbols)Operating/Safety Instructions Consignes d'utilisation/de sécurité Instrucciones de funcionamiento y seguridad
GWS10-450 GWS10-450P GWS10-450PD
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Two industrial angle cuters shown in grayscale, no text or symbols visible
BOSCH
Call Toll Free for Consumer Information and Service Locations Pour obtenir des informations et les adresses de nos centres de service après-vente, appelez ce numéro gratuit Llame gratis para obtener información para el consumidor y ubicaciones de servicio
1-877-BOSCH99 (1-877-267-2499) www.boschtools.com
For English Version See page 2
| Safety SymbolsThe definitions below describe the level of severity for each signal word.Please read the manual and pay attention to these symbols. | |
 | This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. |
 | DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury. |
 | WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury. |
 | CAUTION indicates a hazardous situation which, if not avoided, could result in minor or moderate injury. |
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 or 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 Ground Fault Circuit Interrupter (GFCI) protected supply. Use of an GFCI 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 energizing 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 jewelry. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry 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.
Power Tool-Specific Safety Warnings
Safety Warnings Common for Grinding, Sanding, Wire Brushing, and 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 which 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 arbour 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 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 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 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. 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 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.
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 kickout. 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 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 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 wheels from larger power tools. Wheel intended for larger power tool is 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 reenter 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.
Do not use type 1 abrasive wheels designed for straight grinding.
Do not attempt to cut large stock or sheets of metal as this machine is not designed to be a dedicated cut-off machine.
Safety Warnings Specific for Sanding Operations:
Do not use excessively oversized sanding disc paper. Follow manufacturer's 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
Do not use AC only rated tools with a DC power supply. While the tool may appear to work, the electrical components of the AC rated tool are likely to fail and create a hazard to the operator.
Keep handles dry, clean and free from oil and grease. Slippery hands cannot safely control the power tool.
Use clamps or other practical way to secure and support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control.
Develop a periodic maintenance schedule for your tool. When cleaning a tool be careful not to disassemble any portion of the tool since internal wires may be misplaced or pinched or safety guard return springs may be improperly mounted. Certain cleaning agents such as gasoline, carbon tetrachloride, ammonia, etc. may damage plastic parts.
Do not use vacuum or other dust collection system when cutting metal. Sparks from metal cutting can cause fire in the collector.
WARNING
Some dust created by power sanding, sawing,
grinding, drilling, and other construction activities contains chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:
- Lead from lead-based paints,
- Crystalline silica from bricks and cement and other masonry products, and
- Arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.
Symbols
IMPORTANT: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer.
| Symbol Designation / Explanation | |
| V Volts (voltage) | |
| A Amperes (current) | |
| Hz Hertz (frequency, cycles per second) | |
| W Watt (power) | |
| kg Kilograms (weight) | |
| min Minutes (time) | |
| s Seconds (time) | |
 | Diameter (size of drill bits, grinding wheels, etc.) |
| n_0 | No load speed (rotational speed at no load) |
| n Rated speed (maximum attainable speed) | |
| .../min | Revolutions or reciprocation per minute (revolutions, strokes, surface speed, orbits etc. per minute) |
| 0 Off position (zero speed, zero torque...) | |
| 1, 2, 3, ...I, II, III, | Selector settings (speed, torque or position settings. Higher number means greater speed) |
| [640A] | Infinitely variable selector with off (speed is increasing from 0 setting) |
| [A55A] | Arrow (action in the direction of arrow) |
| [DK07] | Alternating current (type or a characteristic of current) |
| [VA3T] | Direct current (type or a characteristic of current) |
 | Alternating or direct current (type or a characteristic of current) |
 | Class II construction (designates double insulated construction tools) |
| [W634] | Earthing terminal (grounding terminal) |
 | Warning symbol (alerts user to warning messages) |
Symbols (continued)
IMPORTANT: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer.
| Symbol Designation / Explanation | |
 | Alerts user to read manual |
 | Alerts user to wear eye protection |
 | Alerts user to wear respiratory protection |
 | Alerts user to wear hearing protection |
 | This symbol designates that this tool is listed by Underwriters Laboratories. |
 | This symbol designates that this tool is listed by Underwriters Laboratories, to United States and Canadian Standards. |
 | This symbol designates that this tool is listed by the Canadian Standard Association. |
 | This symbol designates that this tool is listed by the Canadian Standard Association, to United States and Canadian Standards. |
 Intertek | This symbol designates that this tool is listed by the Intertek Testing Services, to United States and Canadian Standards. |
 | Designates Li-ion battery recycling program |
Functional Description and Specifications
Disconnect the plug from the power source before making any assembly, adjustments or changing accessories. Such preventive safety
measures reduce the risk of starting the tool accidentally.
GWS10-450
Angle Grinder with Side Switch
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FIG. 1 Guard Release / Adjustment Lever Spindle Lock Ventilation Openings Side Switch Grinding Wheel Lock Nut Type 41/1A Cutting Guard (optional accessory) Type 27 Grinding Guard Side Handle Hand Shield (sold separately)NOTE: For tool specifications refer to the nameplate on your tool.
Accessory speed rating must be equal to or greater than the tool's speed rating.
Do not exceed the recommended wheel diameter.
NOTE: Not recommended for use with type 11 cup wheels.
Functional Description and Specifications
WARNING
Disconnect the plug from the power source before making any assembly, adjustments or changing accessories. Such preventive safety
measures reduce the risk of starting the tool accidentally.
GWS10-450P, GWS10-450PD
Angle Grinder with Paddle Switch
FIG. 2
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Guard Release / Adjustment Lever Spindle Lock Type 27 Grinding Guard Grinding Wheel Lock Nut Paddle Switch Side Handle Lock On Switch (GWS10-450P) "Lock-Off" Switch Release Lever Hand Shield (sold separately) Type 41/1A Cutting Guard (optional accessory)NOTE: For tool specifications refer to the nameplate on your tool.
Accessory speed rating must be equal to or greater than the tool's speed rating.
Do not exceed the recommended wheel diameter.
NOTE: Not recommended for use with type 11 cup wheels.
Functional Description and Specifications
WARNING
Disconnect the plug from the power source before making any assembly, adjustments or changing accessories. Such preventive safety
measures reduce the risk of starting the tool accidentally.
| Model number GWS10-450 GWS10-450P GWS10-450PD | |||
| Amps 10 10 10 | |||
| Rated speed n 11,000/min n 11,000/min n 11,000/min | |||
| Switch Type Side Paddle Paddle | |||
| Spindle thread 5/8"-11 UNC 5/8"-11 UNC 5/8"-11 UNC | |||
| Max.Type 27 grinding wheel ∅ 4 1/2" (115mm) 4 1/2" (115mm) 4 1/2" (115mm) | |||
| Type 27 grinding wheel thickness 1/8" - 1/4"(3mm - 6mm) 1/8" - 1/4"(3mm - 6mm) | |||
| Max.Type 27A/42 cutting wheel ∅ 4 1/2" (115mm) 4 1/2" (115mm) 4 1/2" (115mm) | |||
| Max. flap disc ∅ 4 1/2" (115mm) 4 1/2" (115mm) 4 1/2" (115mm) | |||
| Max. sanding disc ∅ 4 1/2" (115mm) 4 1/2" (115mm) 4 1/2" (115mm) | |||
| Max. wire wheel ∅ 4" (102mm) 4" (102mm) 4" (102mm) | |||
| Max. wire cup brush ∅ 3" (76 mm) 3" (76 mm) | |||
Application
| Model Number | GWS10-450 | GWS10-450P | GWS10-450PD |
| Metal Grinding (Type 27) | X | X | X |
| Metal Grinding (Type 11) | N | N | N |
| Metal Cutting (Type 41/1A) O | O | O | |
| Concrete Surfacing O | O | O | |
| Concrete/Masonry Cutting O | O | O | |
| Sanding * O | O | O | |
| Wire Brushing (Wheel) | X | X | X |
| Wire Brushing (Cup) * O | O | O |
X = Tool is provided with attachments to perform this application.
O = Tool can use optional attachments to perform this application.
N = Tool is not capable of this application.
* Hand Shield (sold separately) is required.
Assembly
Wheel Guard Installation
WARNING
Wheel guard must be attached when using
disc grinding or cutting wheels. Always keep wheel guard between you and your work while grinding or cutting.
To attach wheel guard: Disconnect tool from power source.
Press and hold the release lever (Fig. 3), and place the guard on the guard mounting flange until the guard's keys line up with the notches in the spindle collar (Fig. 3, A).
Press the guard onto the guard mounting flange until the shoulder of the guard is seated against the flange of the tool, and turn the guard until it can clearly be heard to engage.
Adjust the position of the guard to the requirements of the work process. For this, press the release lever upward and turn the guard until it clicks into place then adjust as needed.
• Always adjust the guard in such a manner that all 3 red cams of release lever engage into the corresponding notches of the guard (Fig. 3, B).
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Fig. 3 Guard Release Lever Guard Mounting Flange Keys A B- Adjust the guard in such a manner that sparking is prevented in the direction of the operator.
- The guard should turn only upon actuation of the release lever! Otherwise the tool may not continue to be used under any circumstances and must be taken to an after-sales service agent.
Note: The encoding keys on the guard ensure that only a guard that fits the tool type can be mounted.
To remove guard: Press release lever, rotate guard until the keys on guard line up with the notches on the guard mounting flange, and lift guard off the guard mounting flange (Fig. 3).
Side Handle
The side handle is used to control and balance the tool. The handle must be threaded into the front housing on either side of the tool, depending on personal preference and comfort. Use the side handle for safe control and ease of operation (Fig. 4).
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FIG. 4 Hand Shield (sold separately) ② Side Handle ①Hand Shield (sold separately)
The hand shield is to be used with backing pads, sanding discs and wire brushes to keep fingers and hand away from work surface, sharp edges, burrs and debris. When using the hand shield accessory (sold separately), insert side handle through hole in shield and then thread into housing (Fig. 4).
Ensure that hand shield is positioned between hand and backing pad, sanding disc or wire brush.
Assembly
Lock Nut and Backing Flange
Your tool is equipped with a threaded spindle for mounting accessesories. Always use the supplied lock nut (and backing flange) that has same thread size as spindle. Backing flange is keyed.
Disc Grinding Wheel Assembly
Disconnect tool from power source. Be sure that wheel guard is in place for grinding. Place BACKING FLANGE and GRINDING WHEEL on the spindle.
Thread on the lock nut and tighten it using the supplied wrench, while holding the spindle lock (Fig. 5).
TO REMOVE: Reverse procedure.
WHEN USING SPIN-ON WHEELS
Follow steps 1 & 2, then thread wheel directly onto spindle without using the supplied flanges.
TO REMOVE: Reverse procedure.
All parts of a spin-on wheel must be within lip of grinding guard (Fig. 6). If spin-on wheel is past lip of guard, do not use that wheel as it does not fit on this grinder.
WARNING
Do not use accessories that run eccentrically.
The tool will vibrate excessively and may cause loss of control and the accessory may burst.
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Fig. 5 Spindle Type 27 Wheel Guard Backing Flange Lock Nut Type 27 Grinding Wheel Spindle Backing Flange Lock Nut Type 27 Grinding Wheel
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Fig. 6 Lip of Guard Spin-On WheelAssembly
Abrasive Type 27A/42 Wheel Assembly
Using the Type 41/1A wheel guard (sold separately), it is possible to perform limited cutting on small stock such as metal tubes, piping or rebar.
Do not attempt to cut large stock or sheets of metal as this tool is not designed to be a dedicated cutting tool.
WARNING
Always use Type 41/1A protection guard for
cutting.
Disconnect tool from power source. Be sure that wheel guard is in place for cutting.
When using mounting wheels, place the BACKING FLANGE on the spindle and then place the WHEEL on the spindle.
Thread on the lock nut and tighten it using the supplied lock nut wrench, while holding the spindle lock (Fig. 7).
TO REMOVE: Reverse procedure.
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Fig. 7 Spindle Type 41/1A Wheel Guard (sold separately) Backing Flange Type 41/1A Cutting Wheel Lock Nut Lock Nut Type 27A/42 Cutting WheelType 1 Abrasive Straight Grinding Wheels
Do not use Type 1 abrasive wheels
designed for straight/die grinding. This tool is not designed for use with Type 1 abrasive straight/die grinding wheels.
Sanding Accessories Assembly
BACKING PAD
Before attack hing a backing pad be sure its
maximum safe operating speed is not exceeded by the nameplate speed of the tool.
Wheel guard may not be used for most sanding
operations. Always reinstall wheel guard when converting back to grinding operations.
TO INSTALL BACKING PAD AND SANDING DISC (sold separately)
Disc connec ttool from power source.
Attach hand shield (Fig. 8). Set the tool on its top side (spindle up). Place the rubber backing pad onto the spindle shaft. Center the sanding disc on top of the backing pad. Insert the lock nut (sold separately) through the disc and thread onto the spindle as far as you can with your fingers. Press in the spindle lock, then tighten the backing pad securely with lock nut wrench (Fig. 8).
TO REMOVE: Reverse procedure.
Wire Brush Assembly
Before assembling wire brush to this tool, disconnect from the power source. Attach hand shield (Fig. 8). Wire brushes are equipped with their own threaded hub, simply thread on to spindle. Be sure to seat against shoulder before turning tool "ON". TO REMOVE: Reverse procedure.
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Fig. 8 Wire Brush Backing Pad Sanding Disc Lock Nut (sold separately)
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Hand Shield (sold separately)Assembly
Wire Wheel Assembly
Before assembling wire wheel to this tool, disconnect from the power source. Attach type 27 guard (Fig. 9). Wire wheels are equipped with their own threaded hub, simply thread on to spindle. Be sure to seat against shoulder before turning tool "ON". TO REMOVE: Reverse procedure.
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FIG. 9 Spindle Type 27 Wheel Guard Wire WheelConcrete Dust Extraction Attachment for Surfacing Grinding Assembly
WARNING
A type 27 grinding wheel guard may not be used
for all tool operations. Do not discard guard when not in use. Always reinstall wheel guard when converting back to grinding operations.
WARNING
Dust Extraction Attachment is not a
guard, do not use with bonded abrasive wheels. Dust extraction attachment may not protect operator in the event of a wheel burst.
TO INSTALL CONCRETE DUST EXTRACTION ATTACHMENT (FIG. 10)
- Unplug tool from power source.
- Position appropriate attachment on spindle neck with dust port pointing away from tool body.
- Rotate attachment clockwise 90° until
guard clicks in place.
- Adjust attachment by depressing guard release button and rotate to desired position.
- Allow guard release button to click in place.
- Place the backing flange on the spindle.
- Place the diamond cup wheel onto the spindle and align with the flange.
- Thread the lock nut onto the spindle with the lock nut relief facing the accessory.
- Tighten lock nut with supplied lock nut wrench while holding spindle lock.
When using spin on wheels, follow steps 1 - 5, then thread wheel directly onto spindle without using the supplied flanges.
TO REMOVE: Reverse procedure.
FIG. 10
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10 Spindle Concrete Dust Extraction Attachment BOSCH
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Wheel Guard Spindle Neck
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Diagram of a circular mechanical component with internal blades and directional arrows, no text or symbols present.Assembly
Masonry Cutting Guard Assembly
WARNING
A type 27 grinding wheel guard may not be used for all tool operations. Do not discard guard when not in use. Always reinstall wheel guard when converting back to grinding operations.
To improve ergonomics of your grinder when cutting masonry, gearbox must be rotated relative to the position of the switch as the tool was assembled at the factory.
ROTATE GEARBOX (Fig. 11)
- Unplug tool from power source.
- Completely unscrew the four screws between the gear housing and motor body.
- Rotate gear housing to the proper orientation without removing motor from the housing.
For the side switch models, rotate gear housing 180 degrees in the direction indicated in Fig 12, so the switch is 90 degrees from the spindle.
-
Screw in and tighten the four screws you removed.
-
The screw holding the quick release lever is longer than the other screws, this long screw must stay with the quick release lever when re-attaching gear housing for the quick release button to operate properly.
-
Attach proper dust collection guard with foot and accessory.
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FIG. 11 4x ① ② 0 mm Spring Guard Release Lever (x3)
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FIG. 12 Side Switch 180 degrees 4x 180 degrees
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90 degrees ① ② 4x ③ ① Paddle Switch under tool 90 degreesAssembly
INSTALLING MASONRY TYPE 1A/41 CUTTING GUARD
- Use tool adjusted as show in figures 11 and 12.
- Unplug tool from power source.
- Unscrew and remove side handle.
- Slide dust extraction guard on spindle neck.
- Rotate attachment until stability bracket and hole for side handled are aligned.
- Screw in side handle to secure stability bracket between the tool housing and handle.
- Adjust guard to desired depth of cut.
TO REMOVE: Reverse procedure.
INSTALLING DRY DIAMOND WHEEL (Fig. 13)
- Place the backing flange on the spindle. Turn flange until it locks with the base of the spindle.
- Place the dry diamond wheel onto the spindle and align the arbor hole of the grinding wheel with the shoulder of the backing flange.
- Thread on the lock nut and tighten it with supplied lock nut wrench while holding spindle lock.
TO REMOVE: Reverse procedure.
FIG. 13
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Lock Nut Backing Flange Dry Diamond Wheel Spindle
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Spindle Backing Flange Dry Diamond Wheel Lock Nut Lock nut Backing Flange Dry Diamond Wheel SpindleOperating Instructions
WARNING
Hold the tool with both hands while starting the tool, since torque from the motor can cause the tool to twist.
Start the tool before applying to work and let the tool come to full speed before contacting the workpiece. Lift the tool from the work before releasing the switch. DO NOT turn the switch "ON" and "OFF" while the tool is under load; this will greatly decrease the switch life.
Side On-Off Switch with Lock
The tool is switched "ON" by the side switch located at the side of the motor housing (Fig. 14). The switch can be locked in the "ON" position, a convenience for long grinding operations.
To turn the tool "ON" without locking it, move the switch forward by applying pressure ONLY at the REAR portion of the switch. When pressure is released the switch will return to "OFF" position. TO LOCK THE SWITCH "ON", move the switch forward and press the FRONT portion.
TO UNLOCK THE SWITCH, simply press and release the REAR portion of the slider. Switch is spring loaded and will snap back automatically.
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Fig. 14 Side SwitchPaddle Switch
The paddle switch has a lock-off feature to help prevent accidental startups.
TO TURN TOOL "ON", push lock-off switch forward to unlock the paddle switch, then squeeze paddle switch (Fig. 15).
TO TURN TOOL "OFF", release pressure on paddle switch. The switch is spring loaded and will return to the "OFF" position automatically.
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ON OFF ① ② Fig. 15Grinding Operations
SELECTING GRINDING WHEELS
WARNING
Before using a grinding wheel, be certain that its maximum safe operating speed is not exceeded by the nameplate speed of the grinder. Do not exceed the recommended wheel diameter.
DISC GRINDING WHEELS
Grinding wheels should be carefully selected in order to use the grinder most efficiently. Wheels vary in type of abrasive, bond, hardness, grit size and structure. The correct type of wheel to use is determined by the job. Use disc grinding wheels for fast grinding of structural steel, heavy weld beads, steel casting, stainless steel and other ferrous metals.
Operating Instructions
GRINDING TIPS
Efficient grinding is achieved by controlling the pressure and keeping the angle between wheel and workpiece at 10^ to 15^ (Fig. 16). If the wheel is flat, the tool is difficult to control. If the angle is too steep, the pressure is concentrated on a small area causing burning to the work surface.
FIG. 16
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15°WARNING
Excessive or sudden pressure on the wheel will slow grinding action and put dangerous stresses on the wheel.
When grinding with a new wheel be certain to grind while pulling tool backwards until wheel becomes rounded on its edge. New wheels have sharp corners which tend to "bite" or cut into work piece when pushing forward.
Cutting Operations
METAL CUTTING
A Type 1 wheel guard may not be included with this tool but is required when using a cutting wheel. Cutting with a type 27 wheel guard may not provide the operator sufficient protection in the event of a wheel burst.
With this grinder it is possible to perform cutting of limited small stock such as metal tubes, piping or rebar. When cutting, work with moderate feed, adapted to the material being cut. When cutting profiles and square bar, it is best to start at the smallest cross section.
Always follow precautions for kickback.
- Allow the tool to reach full speed before touching the tool to the work surface.
- The tool should always be used in such way that the sparks are directed away from user.
-
Apply minimum pressure to the work surface, allowing the tool to operate at high speed. Cutting rate is greatest when the tool operates at high speed.
-
Do not exert side pressure onto the cutting disc. Do not tilt or oscillate the tool as wheel may burst, (Fig. 17).
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FIG. 17- Remove the tool from the work surface before turning the tool off. Allow the tool to stop rotating before laying it down.
MASONRY / CONCRETE CUTTING
With this grinder it is possible to perform cutting of concrete and masonry materials. When cutting, work with moderate feed, adapted to the material being cut.
Always follow precautions for kickback.
Operate the tool with a dust extraction system and personal dust protection, e.g. respirator, dust mask, etc. The vacuum used for this application must be approved for the extraction of masonry and concrete dust. Bosch sells suitable vacuum cleaners.
WARNING
Never pull the tool backward since blade will climb out of the material and KICKBACK will occur.
- Allow the tool to reach full speed before touching the tool to the work surface.
- If plunge cutting:
a. Tilt tool forward with wheel lined up with the cut line and hold the tool by the grinder body and the auxiliary handle (Fig. 18).
Operating Instructions
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Mechanical diagram showing a valve assembly with rotating components and a downward arrow indicating motion (no text or symbols)b. Gradually lower the rear of tool using the front end of the foot as the hinge point.
c. When the foot rests flat on the surface being cut, proceed cutting in forward direction to end of cut.
- Always maintain contact between the guard foot and work piece.
- Slide the tool forward at a moderate speed adapted to the material being cut. Always cut towards the dust extraction port to maximize dust extraction and reduce likelihood of kickback (Fig. 19).
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Diagram of a mechanical device with a coiled hose and rotating component, showing directional arrows (no text or symbols)- Apply minimum pressure to the work surface, allowing the tool to operate at high speed. Cutting rate is greatest when the tool operates at high speed.
- When the cut is completed, remove tool from work piece before turning off. Allow wheel to stop rotating before setting tool down.
Tip: When performing deep cuts, it is best to cut in several shallow passes. Each pass should be only to the segment depth of the wheel. Masonry dust is abrasive and may wear and weaken the segment bond.
When cutting especially hard material, e. g., concrete with high pebble content, the dry diamond wheel can overheat and become damaged. This is clearly indicated by circular sparking of the rotating dry diamond wheel. In this case, interrupt the cutting process and allow the dry diamond wheel to cool by running the tool for a short period of time at the maximum speed with no-load.
Noticeable decreasing work progress and circular sparking are indications of a dry diamond wheel that has become dull. Briefly cutting into abrasive materials (e. g. brick) can resharpen the wheel.
CONCRETE SURFACING
Operate the tool with a dust extraction system and personal dust protection, e.g. respirator, dust mask, etc. The vacuum used for this application must be approved for the extraction of masonry and concrete dust. Bosch sells suitable vacuum cleaners.
Diamond cup wheels should be carefully selected in order to use the grinder most efficiently. Wheels vary in type of material they are designed to remove and how aggressively they will remove material. The correct wheel to use is determined by the job.
- Allow the tool to reach full speed before touching the tool to the work surface.
- Hold the tool with two hands and keep diamond wheel flat on the work surface.
- Apply minimum pressure, allowing the tool to operate at high speed. Removal rate is greatest when the tool operates at high speed.
- Continuously move the tool at a moderate speed to avoid creating gouges in the work surface.
- Remove the tool from work surface before turning tool off. Allow the tool to stop rotating before laying it down.
Tip: For optimal dust collection, all sides of the surfacing dust collection guard must stay in contact with the surface and the surfacing guard must be connected to a vacuum. A dull diamond wheel can be sharpened by briefly surfacing an abrasive material (eg. sand stone).
Sanding Operations
SELECTING SANDING DISC
Sanding discs are made of extremely hard and sharp aluminum oxide grits, phenol-resin bonded to a sturdy fiber backing for fast heavy-duty service and long life. The discs vary as to size and spacing of the abrasive grits. OPEN COAT (type H) — used for soft materials and on paint or varnish. CLOSED COAT (type K) — used for metal, hardwood, stone, marble and other materials.
Sanding discs range in grit from 16 (very coarse) to 180 (very fine). To obtain best results, select sanding discs carefully. Many jobs require the use of several grit sizes and at times both “open coat and closed coat” discs are required to get the job done faster. See chart for application examples.
| Operation:Refinishing painted wood or metal surfaces | |
| REMARKS GRIT | |
| To remove paint and to smooth surface irregularities. | Coarse 16-24-30 |
| To smooth the rough sanding. | Medium 36-50-80 |
| To remove scratches left by previous discs. | Fine 100-120 |
| To smooth surfaces for painting, polishing or waxing. | Very Fine 150-180 |
Sanding Tips
For best results, tilt the Disc Sander at a 10^ to 15^ angle while sanding so that only about 1" of the surface around the edge of the disc contacts the work (Fig. 20).
FIG. 20
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15°WARNING
If the disc (accessory) is held flat or the back
edge of the disc comes in contact with the work, a violent thrust to the side may result.
If sander is tilted too much, sanding action will be too great and a rough cut surface or gouging and snagging will result.
Guide the Disc Sander with crosswise strokes. Be careful not to hold the sander in one spot too long. Do not use a circular motion, as this makes swirl marks. Test before use on scrap stock.
Do not force or apply pressure when sanding. Use only the weight of the tool for pressure. Excess pressure actually slows the tool down. If faster stock removal is desired, change to a coarser grit disc.
Remove gummy paint from metal with an "open coat" disc. Sand until sparks start to appear, then stop and change to a "closed coat" disc to remove any remaining paint.
Sanding Wood
When sanding wood the direction of the disc motion at the contact point should parallel the grain as much as possible. The rapid cut of discs and the swirl type scratch pattern they occasionally create generally prohibit their use for producing the final finish.
Scratches and circular marks are usually the result of using too coarse a grit. When changing to a finer grit, move across the sand ing lines that were made by a previous coarser disc.
Sanding Metal
When sanding automobiles or appliances, wipe the metal clean with a non-flammable solvent or commercial cleaner to remove all wax and grease. By doing this first, the sanding discs will sand better and last longer.
For heavy duty work, use a coarse grit disc first. Follow-up with a medium grit to remove scratches. To produce smooth finish, use fine grit disc.
Operating Instructions
Wire Brush Operations
Wire brushes are intended to "clean" structural steel, castings, sheet metal, stone and concrete. They are used to remove rust, scale and paint.
WARNING
Avoid bouncing and snagging the wire brush, especially when working corners, sharp edges etc. This can cause loss of control and kick-back.
FIG. 21
| WIRE CUP BRUSH | |
| CORRECT: Wire tips doing the work. |  |
| INCORRECT: Excessive pressure can cause wire breakage. |  |
Brushing Pressure
- Remember, the tips of a wire brush do the work. Operate the brush with the lightest pressure so only the tips of the wire come in contact with the work.
- If heavier pressures are used, the wires will be overstressed, resulting in a wiping action; and if this is continued, the life of the brush will be shortened due to wire fatigue.
- Apply the brush to the work in such a way that as much of the brush face as possible is in full contact with the work. Applying the side or edge of the brush to the work will result in wire breakage and shortened brush life.
| WIRE WHEEL BRUSH | |
| CORRECT: Wire tips doing the work. |  |
| INCORRECT: Excessive pressure can cause wire breakage. |  |
Maintenance
WARNING
To avoid accidents, always disconnect the tool and/or charger from the power supply before servicing or cleaning.
Service
WARNING
NO USER SERVICEABLE PARTS INSIDE.
Preventive maintenance performed by un- authorized personnel may result in misplacing of internal wires and components which could cause serious hazard. We recommend that all tool service be performed by a Bosch Factory Service Center or Authorized Bosch Service Station.
SERVICE MEN: Disconnect tool and/or charger from power source before servicing.
Tool Lubrication
Your Bosch tool has been properly lubricated and is ready for use.
Carbon Brushes
The brushes and commutator in your tool have been engineered for many hours of dependable service. To maintain peak efficiency of the motor, we recommend every two to six months the brush es be examined. Only genuine Bosch replace ment brushes specially designed for your tool should be used.
Bearings
After about 300-400 hours of operation, or at every second brush change, the bearings should be replaced at Bosch Factory Service Center or Authorized Bosch Service Station. Bearings which become noisy (due to heavy load or very abrasive material cutting) should be replaced at once to avoid overheating or motor failure.
Cleaning
CAUTION
Certain cleaning agents and solvents damage
plastic parts. Some of these are: gasoline, carbon tetrachloride, chlorinated cleaning solvents, ammonia and household detergents that contain ammonia.
Ventilation openings and switch levers must be kept clean and free of foreign matter. Do not attempt to clean by inserting pointed objects through opening.
Extension Cords
WARNING
If an extension cord is necessary, a cord with
adequate size conductors that is capable of carrying the current necessary for your tool must be used. This will prevent excessive voltage drop, loss of power or overheating. Grounded tools must use 3-wire extension cords that have 3-prong plugs and receptacles.
NOTE: The smaller the gauge number, the higher the cord capacity.
RECOMMENDED SIZES OF EXTENSION CORDS 120 VOLT ALTERNATING CURRENT TOOLS
| Tool's Ampere Rating | Cord Size in A.W.G. | Wire Sizes in mm2 | ||||||
| Cord Length in Feet | Cord Length in Meters | |||||||
| 25 | 50 | 100 | 150 | 15 30 | 60 | 120 | ||
| 3-6 | 18 | 16 | 16 | 14 | 075 | 0.75 | 1.5 | 2.5 |
| 6-8 | 18 | 16 | 14 | 12 | 0.75 | 1.0 | 2.5 | 4.0 |
| 8-10 | 18 | 16 | 14 | 12 | 0.75 | 1.0 | 2.5 | 4.0 |
| 10-12 | 16 | 16 | 14 | 12 | 1.0 | 2.5 | 4.0 | - |
| 12-16 | 14 | 12 | - | - | - | - | - | - |
Accessories and Attachments
WARNING
The use of any other attachments or acces so ries not specified in this manual may create a hazard.
Store accessories in a dry and temperate environment to avoid corrosion and deterioration.
| Standard equipment Optional accessories and attachments | |
| - Type 27 wheel guard- Lock nut- Backing flange- Side handle- Lock nut wrench | - Lock nut- Type 41/1A wheel guard- Hand shield |
NOTE: Not recommended for use with type 11 cup wheels.
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Diagram of a circular mechanical component with internal blades and directional arrows indicating rotation (no text or symbols)Assemblage
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FIG. 17 Xnatural_image
Mechanical diagram showing a pipe connection with rotating components and directional arrows (no text or symbols)FIG. 18
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Diagram of a mechanical device with a coiled tube and rotating arm, showing fluid flow direction (no text or symbols)natural_image
Illustration of a hand using a tool to adjust or install a component, with no visible text or symbols.natural_image
Mechanical diagram showing a valve mechanism with rotating components and fluid flow (no text or symbols)FIG. 18
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Mechanical diagram showing a valve assembly with rotating components and fluid flow (no text or symbols)Robert Bosch Tool Corporation ("Seller") warrants to the original purchaser only, that all BOSCH portable and benchtop power tools will be free from defects in material or workmanship for a period of one year from date of purchase. SELLER'S SOLE OBLIGATION AND YOUR EXCLUSIVE REMEDY under this Limited Warranty and, to the extent permitted by law, any warranty or condition implied by law, shall be the repair or replacement of parts, without charge, which are defective in material or workmanship and which have not been misused, carelessly handled, or misrepaired by persons other than Seller or Authorized Service Station. To make a claim under this Limited Warranty, you must return the complete portable or benchtop power tool product, transportation prepaid, to any BOSCH Factory Service Center or Authorized Service Station. For Authorized BOSCH Power Tool Service Stations, please refer to your phone directory.
THIS LIMITED WARRANTY DOES NOT APPLY TO ACCESSORY ITEMS SUCH AS CIRCULAR SAW BLADES, DRILL BITS, ROUTER BITS, JIGSAW BLADES, SANDING BELTS, GRINDING WHEELS AND OTHER RELATED ITEMS.
ANY IMPLIED WARRANTIES SHALL BE LIMITED IN DURATION TO ONE YEAR FROM DATE OF PURCHASE. SOME STATES IN THE U.S., SOME CANADIAN PROVINCES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
IN NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING BUT NOT LIMITED TO LIABILITY FOR LOSS OF PROFITS) ARISING FROM THE SALE OR USE OF THIS PRODUCT. SOME STATES IN THE U.S. AND SOME CANADIAN PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE IN THE U.S., PROVINCE TO PROVINCE IN CANADA AND FROM COUNTRY TO COUNTRY.
THIS LIMITED WARRANTY APPLIES ONLY TO PORTABLE AND BENCHTOP ELECTRIC TOOLS SOLD WITHIN THE UNITED STATES OF AMERICA, CANADA AND THE COMMONWEALTH OF PUERTO RICO. FOR WARRANTY COVERAGE WITHIN OTHER COUNTRIES, CONTACT YOUR LOCAL BOSCH DEALER OR IMPORTER.
GARANTIE LIMITÉE DES OUTILS ÉLECTRIQUES PORTATIFS ET D'ÉTABLI BOSCH
© Robert Bosch Tool Corporation 1800 W. Central Road Mt. Prospect, IL 60056-2230
Exportado por: Robert Bosch Tool Corporation Mt. Prospect, IL 60056-2230, E.U.A.
Importado a México por: Robert Bosch, S.A. de C.V., Calle Robert Bosch No. 405, Zona Industrial, Toluca, Edo. de México, C.P. 50070, Tel. (722) 2792300
2610067291 05/21
