Bosch 1873-8F, 1873-6, 1893-6, 1894-6, 1873-8 User Manual

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IMPORTANT:	IMPORTANT :	IMPORTANTE:
Read Before Using	Lire avant usage	Leer antes de usar

Operating/Safety Instructions Consignes de fonctionnement/sécurité

Instrucciones de funcionamiento y seguridad

1873-6

1873-8

1873-8F

1893-6

1894-6

Call Toll Free for	Pour obtenir des informations	Llame gratis para
Consumer Information	et les adresses de nos centres	obtener información
& Service Locations	de service après-vente,	para el consumidor y
	appelez ce numéro gratuit	ubicaciones de servicio

1-877-BOSCH99 (1-877-267-2499) www.boschtools.com

For English Version	Version française	Versión en español
See page 2	Voir page 13	Ver la página 24

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General Safety Rules

! WARNING Read all instructions. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury. The term “power tool” in

all of the warnings listed below refers to your mains-operated (corded) power tool or batteryoperated (cordless) power tool.

SAVE THESE INSTRUCTIONS

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.

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.

If operating the power tool in damp locations is unavoidable a Ground Fault Circuit Interrupter (GFCI) must be used to supply the power to your tool. GFCI and personal protection devices like electrician’s rubber gloves and footwear will further enhance your personal safety.

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 safety equipment. Always wear eye protection. Safety equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.

Avoid accidental starting. Ensure the switch is in the off-position before plugging in. Carrying power tools with your finger on the switch or plugging in 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 these devices can reduce dustrelated hazards.

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Keep handles dry, clean and free from oil and grease. Slippery hands cannot safely control the power tool.

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 tools 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 and in the manner intended for the particular type of power tool, 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.

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.

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.

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.

SAVE THESE INSTRUCTIONS

Angle Grinder Safety Rules

Always use proper guard with grinding wheel. A guard protects operator from broken wheel fragments. When using grinding wheel attachments, the guard must always be attached to the tool and positioned for maximum safety, so the least amount of wheel is exposed from the side the tool is being operated.

Accessories must be rated for at least the speed recommended on the tool warning label. Wheels and other accessories running over rated speed can fly apart and cause injury. Grinding wheels or any other

accessory must have a maximum safe operating speed greater than the “no load RPM” marked on the tool’s nameplate.

Hold tool by insulated gripping surfaces when performing an operation where the cutting tools may contact hidden wiring or its own cord. Contact with a “live” wire will make exposed metal parts of the tool “live” and shock the operator.

Always use auxiliary handle for maximum control over torque reaction or kick-back.

Operation of the grinder without the side handle could cause loss of control of the

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grinder, resulting in possible serious personal injury.

Before using a grinder or installing a new wheel, inspect the grinding wheel for chips and cracks. Remove bad wheels immediately. Run the tool at no load for one minute, holding the tool in the direction away from people. Wheels with flaws will normally break apart during this time.

Carefully handle both the tool and individual grinding wheels to avoid chipping or cracking. Install a new wheel if tool is dropped while grinding. Do not use a wheel that may be damaged.

Fragments from a wheel that bursts during operation will fly away at great velocity possibly striking you or bystanders.

Do not use grinding wheel that is larger than the maximum recommended size for your tool, or worn down damaged wheels from larger grinders. Wheels intended for large angle sander/grinders are not suitable for the high speed of a small angle sander/grinder, these wheels may easily burst and the fragments strike you or bystanders.

Do not use depressed hub grinding wheels for cut-off operations. Depressed hub wheels or type 27 wheels are not intended for side loading and may shatter under overload.

Do not use this tool with “Woodcarving” blade. Such blades create frequent kick-back and loss of control.

Wear proper apparel while using a sander/grinder. Face shield or at least safety goggles, dust mask, leather gloves and shop apron capable of stopping small wheel or workpiece fragments.

Position the cord clear of the spinning grinding wheel or any other sanding accessory. Do not wrap the cord around your arm or wrist. If you lose control and have the cord wrapped around your arm or wrist it may entrap you and cause injury.

Avoid bouncing and snagging the wheel, especially when working corners, sharp edges etc. This can cause loss of control and kick-back.

Regularly clean the tool’s air vents by compressed air. Excessive accumulation of powdered metal inside the motor housing may cause electrical failures.

Do not grind or sand near flammable materials. Sparks from the wheel could ignite these materials.

This tool can be converted to a sander. When grinding is resumed the proper guard and wheel flanges MUST be reinstalled before proceeding with grinding. The guard must always be attached to the tool and positioned for maximum safety, so the least amount of wheel is exposed from the side the tool is being operated. The grinding wheel guard cannot be used for most sanding operations or for wire brushing.

When sanding, do not use oversized sanding disc. Larger sanding disc will extend beyond the sanding pad causing snagging, tearing of the disc or kick-back. Extra paper extending beyond the sanding pad can also cause serious lacerations.

When sanding chemically pressure treated lumber, paint that may be lead based, or any other materials that may contain carcinogens, use special precautions. A suitable breathing respirator must be worn by all personal entering the work area. Work area should be sealed by plastic sheeting and persons not protected should be kept out until work area is thoroughly cleaned.

Direct the discharge of the spinning wire brush away from you. Small particles and tiny wire fragments may be discharged at high velocity during the “cleaning” action with these brushes and may become imbedded in your skin.

Some dust created by ! WARNING 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 chemicallytreated 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.

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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						Name	Designation/Explanation
		V				Volts	Voltage (potential)
		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.
		n0				No load speed	Rotational speed, at no load
.../min						Revolutions or reciprocation per minute	Revolutions, strokes, surface speed,
							orbits etc. per minute
0						Off position	Zero speed, zero torque...
1, 2, 3, ...						Selector settings	Speed, torque or position settings.
I, II, III,							Higher number means greater speed
0						Infinitely variable selector with off	Speed is increasing from 0 setting
						Arrow	Action in the direction of arrow
						Alternating current	Type or a characteristic of current
						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.
						Earthing terminal	Grounding terminal
						Warning symbol	Alerts user to warning messages
						Ni-Cad RBRC seal	Designates Ni-Cad battery recycling
							program

This symbol designates that this tool is listed by Underwriters Laboratories.

This symbol designates that this tool is listed by the Canadian Standards Association.

This symbol designates that this tool is listed to Canadian Standards by Underwriters Laboratories.

This symbol designates that this tool is listed by Underwriters Laboratories, and listed to Canadian Standards by Underwriters Laboratories.

This symbol designates that

this tool complies to NOM Mexican Standards.

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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.

Angle Grinders

	SPINDLE LOCK	PADDLE
		SWITCH
		VENTILATION
		OPENINGS

VIBRATION CONTROL

	MOUNTING	SPINDLE	SIDE HANDLE
	FLANGE

WHEEL GUARD

GUARD

RELEASE / LOCK

LATCH

BUMPS

Model number

No load speed

Spindle thread

Max. grinding wheel (Type 27) Max. flared cup wheel (Type 11) Max. wire wheel

Max. wire cup brush

Max. sanding disc

NOTE: For tool specifications refer to the nameplate on your tool.

1873-8 & 1873-8F	1873-6	1893-6 & 1894-6
n0 8,500/min	n0 6,000/min	n0 6,000/min
5/8"-11 UNC	5/8"-11 UNC	5/8"-11 UNC
*7" Dia.	*7" Dia.	*9" Dia.
4" Dia.	5” Dia.	5" Dia.
4-1/2" Dia.	6" Dia.	6" Dia.
7" Dia.	6" Dia.	6" Dia.
7" Dia.	7" Dia.	9" Dia.

* Always use appropriate size wheel guard.

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Grinder Assembly

WHEEL GUARD INSTALLATION

Use wheel guard with disc ! WARNING grinding wheels. Always

close the latch to secure the guard. Keep the guard between you and the wheel. Do not direct guard opening toward your body.

The position of the guard can be adjusted to accommodate the operation being performed.

To attach wheel guard DISCONNECT tool from power source.

Open guard release/lock latch and position guard on spindle neck so that the two bumps on guard, line up with the two notches on the spindle neck.

Rotate guard either direction to desired position, and close latch to secure guard in place.

TO REMOVE GUARD: Open guard release/lock latch, rotate guard until the two bumps on guard line up with the two notches on the spindle neck, and lift guard off the spindle neck.

LOCK NUT AND BACKING FLANGE

Your tool is equipped with a threaded spindle for mounting accessories. Always use the lock nut and backing flange that has same thread size as spindle.

DISC GRINDING WHEEL ASSEMBLY

Disconnect tool from power source. Be sure that wheel guard is in place for grinding.

MOUNTING

FLANGE

	SPINDLE
	GUARD
	RELEASE / LOCK
	LATCH
	BUMPS	WHEEL
		GUARD
	SPIN-ON	BACKING
		FLANGE
	GRINDING
	WHEEL
		DISC
		GRINDING
		WHEEL
		LOCK NUT

When using spin-on grinding wheels, thread directly onto the spindle.

When using mounting wheels, thread BACKING FLANGE onto spindle, then place GRINDING WHEEL on the spindle. Thread on the lock nut and tighten nut using a lock nut wrench provided with adapter kit, while holding the spindle lock in.

TO REMOVE: Reverse procedure.

CUP GRINDING WHEELS

Use cup grinding wheels for heavy-duty stock removal of metals, concrete and stone.

ADJUSTABLE CUP

WHEEL GUARD INSTALLATION

Open the guard clamp and fit it on the mounting flange then secure by tightening the clamp screw. ALWAYS HAVE THIS GUARD ATTACHED WHEN USING CUP GRINDING WHEELS

The adjustable guard allows you to lower or raise the guard’s shell. TO ADJUST: Loosen the four bolts on the shell, and secure the shell for 1/4” wheel exposure for maximum safety.

ATTACHING CUP GRINDING WHEEL

Thread the cup grinding wheel on the spindle shaft CLOCKWISE. Press in the spindle lock button and turn the cup grinding wheel until the lock button engages, then tighten the wheel securely by hand.

TO REMOVE: Reverse procedure.

SPINDLE

MOUNTING

FLANGE

ADJUSTABLE

GUARD

SHELL

BOLT

CUP

GRINDING

WHEEL

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MOUNTING TYPE 28 OR TYPE 29

GRINDING WHEELS

! WARNING	To reduce the risk of injury,
	do not use the flange set

provided with your tool for mounting type 28 or type 29 grinding wheels. The flanges provided with your tool are not designed for mounting these wheels.

Only use small flange set (available as accessory) when mounting type 28 or type 29 wheels (Fig. 1).

Refer to figures 2 or 3 for proper wheel assembly when using the small flange set.

SMALL FLANGE SET PART NO. 1 607 000 380

FIG. 1

FLANGE WITH SHOULDER

FLANGE OR LOCK NUT

FIG. 2	SPINDLE
	FLANGE WITH SHOULDER	TYPE 28
		GRINDING WHEEL

FLANGE OR LOCK NUT

FIG. 3

SPINDLE

FLANGE OR LOCK NUT

TYPE 29 FLANGE WITH SHOULDER GRINDING

WHEEL

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Sander Assembly

BACKING PAD

! WARNING Before attaching a backing pad be sure its maximum

safe operating speed is not exceeded by the nameplate speed of the tool.

! WARNING 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

Disconnect tool from power source. 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 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.

TO REMOVE BACKING PAD AND

SANDING DISC

Disconnect tool from power source. Using the lock nut wrench unscrew the nut from the spindle, while holding spindle lock in.

WIRE BRUSH ASSEMBLY

Before assembling wire brush to this tool, disconnect from the power source. Wire brushes are equipped with their own threaded hub, simply thread on to spindle. Be sure to seat against shoulder before turning tool “ON”.

SIDE HANDLE

The side handle used to guide and balance the tool can be threaded into the front housing on either side, and on top of the tool, depending on personal preference and comfort. Use the side handle for safe control and ease of operation.

! WARNING Always use auxiliary handle for maximum

control over torque reaction or kick-back.

Operation of the grinder without the side handle could cause loss of control of the grinder, resulting in possible serious personal injury.

SPINDLE LOCK

SPINDLE

RUBBER

BACKING

PAD

		SANDING
		DISC
	SPIN-ON
	WIRE	LOCK NUT
	BRUSH

Operating Instructions

"TRI-CONTROL" PADDLE SWITCH

The “Tri-Control” Paddle Switch enables the operator to control the switch functions of "Lock-OFF", "ON/OFF" and "Lock-ON".

TO UNLOCK SWITCH AND TURN TOOL "ON": Push paddle lever FORWARD (toward the spindle) then squeeze the paddle lever.

TO SWITCH TOOL "OFF": Release pressure on paddle lever. The switch is spring loaded and will return to "OFF" position automatically.

The "Lock-ON" feature, incorporated into the paddle switch, is a convenience for long operations.

TO LOCK SWITCH "ON": After paddle switch has been activated push paddle lever completely FORWARD and release paddle lever.

TO SWITCH TOOL "OFF": Squeeze and then release paddle lever. The switch is spring loaded and will return to "OFF" position automatically.

! WARNING	Hold the tool with both hands
	while starting the tool, since

torque from the motor can cause the tool to twist.

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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.

MOTOR HOUSING RELEASE LEVER (Model 1894-6 only)

Your tool is equipped with a motor housing release lever that will allow you to rotate the spindle in either direction 90˚. To use this feature, pull release lever in direction of arrow to release housing, and rotate housing until it clicks into place.

Grinding 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.

GRINDING TIPS

Efficient grinding is achieved by controlling the pressure and keeping the angle between wheel and workpiece at 10° to 15°. 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.

! 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 workpiece when pushing forward.

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.

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Operation: Refinishing painted wood or metal surfaces.

REMARKS	GRIT
To remove paint and to smooth	Coarse
surface irregularities.	16-24-30
To smooth	Medium
the rough sanding.	36-50-80
To remove scratches left by	Fine
previous discs.	100-120
To smooth surfaces for painting,	Very Fine
polishing or waxing.	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.

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 sanding 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.

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.

Avoid bouncing and snag- ! WARNING ging the wire brush, espe-

cially when working corners, sharp edges etc. This can cause loss of control and kickback.

BRUSHING PRESSURE

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.

CORRECT: Wire tips doing the work.

1.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.

2.If heavier pressures are used, the wires INCORRECT: Excessive pressure can cause wire breakage. 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.

3. Apply the brush to the work in such a way that as much of the brush face as possible is

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