Bosch Power Tools 1821D 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
1821
1821D
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Consumer Information
& Service Locations
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et les adresses de nos centres
de service après-vente,
appelez ce numéro gratuit
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For English Version Version française Versión en español
See page 2 Voir page 18 Ver la página 34
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General Power Tool Safety Warnings
WARNING
!
to follow the warnings and instructions may
result in electric shock, fire and/or serious
injury.
SAVE ALL WARNINGS AND
INSTRUCTIONS FOR FUTURE
The term “power tool” in the warnings refers to
your mains-operated (corded) power tool or
battery-operated (cordless) power tool.
a) Ke ep wo rk ar ea cl ean and we ll li t.
Cluttered or dark areas invite accidents.
b) 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.
c) Keep children and b ystanders away
while operating a power tool. Distractions
can cause you to lose control.
a) Power tool plugs must match the outlet.
Never modify the plug in any way. Do not
use any adapte r plugs wit h earth ed
(grounded) power tools. Unmodified plugs
and matching outlets will reduce risk of
electric shock.
b) Avo id body con tact with ear thed or
gr oun ded su rfa ces suc h as pipes,
radiators, ranges and refrigerators. There
is an increased risk of electric shock if your
body is earthed or grounded.
c) Do not expose power tools to rain or wet
conditions. Water entering a power tool will
increase the risk of electric shock.
d) 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.
e) When operating a power tool outdoors,
us e an exten sio n cord sui tab le for
outdoor use. Use of a cord suitable for
outdoor use reduces the risk of electric
shock.
Read al l safety wa rn in gs
and all instructions. Failure
REFERENCE
1) Work area safety
2) Electrical safety
f) If operating a power tool in a d amp
location is unavoidable, use a Ground
Fault Circuit Interrupter (GFCI) protected
supply. Use of an GFCI reduces the risk of
electric shock.
3) Personal safety
a) 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.
b) Use per sonal protect ive equipme nt.
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.
c) 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.
d) Remove any adjusting key or wrench
befo re turning th e power too l on. A
wrench or a key left attached to a rotating
part of the power tool may result in personal
injury.
e) Do not overreach. Keep proper footing
and balance at all times. This enables
be tte r con tro l of the p owe r tool i n
unexpected situations.
f) Dr ess pro per ly. Do not wear loose
clot hing or je welry . Ke ep you r hair,
clothing and gloves away from moving
parts. Loose clothes, jewelry or long hair
can be caught in moving parts.
g) If de vic es a re pr ovi ded for the
co nne cti on o f dust ext raction an d
collection facilities, ensure these are
connected and properly used. Use of dust
collection can reduce dust-related hazards.
4) Power tool use and care
a) 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.
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b) 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.
c) Disconn ect the plug from the power
source and/or the battery pack from the
po wer to ol bef ore ma kin g any
adjustments, changing accessories, or
storing power tools. Such preventive
safety measures reduce the risk of starting
the power tool accidentally.
d) Store idle power tools out of the reach of
ch ild ren and do not allo w person s
unfamiliar with the power tool or these
instructions to operate the power tool.
Power tools are dangerous in the hands of
untrained users.
e) Ma int ain power to ols . Ch eck for
misalignment or binding of moving parts,
br eak age o f parts and a ny other
conditio n that may affect the p ower
Power Tool-Specific Safety Warnings
Safety Warnings Common for Grinding,
Sanding, Wire Brushing, and Abrasive
Cutting-Off Operations:
a) This power tool is intended to function
as a grinder, sander, wire brush or cutof f tool . Rea d all sa fety warn ings ,
in stru ctio ns, il lust rati ons an d
specifications provided with this power
tool. Failure to follow all instructions listed
below may result in electric shock, fire
and/or serious injury.
b) 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.
c) Do not use accessories which are not
specifically designed and recommended
by the tool manufacturer. Just because
the accessory can be attached to your
po wer tool , it doe s not a ssur e saf e
operation.
d) 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.
tool’s operation. If damaged, have the
power tool repaired before use. Many
accidents are caused by poorly maintained
power tools.
f) Keep cutting to ols sharp and cle an.
Properly maintained cutting tools with sharp
cutting edges are less likely to bind and are
easier to control.
g) Use the power tool, accessories and tool
bi ts etc. in acc ord anc e with these
instructions, taking into account the
working conditions and the work to be
pe rfo rme d. Use of the p owe r too l for
operations different from those intended
could result in a hazardous situation.
5) Service
a) Have your power too l serv iced by a
qu ali fie d repa ir person usi ng onl y
identical replacement parts. This will
ensure that the safety of the power tool is
maintained.
e) The outside diameter and the thickness
of your accessory must be within the
ca paci ty rat ing of your p ower t ool.
Incorrectly sized accessories cannot be
adequately guarded or controlled.
f) Th e arbo r siz e of whe els, flang es,
backing pads or any other accessory
must properly fit the s pin dle of the
power tool. Accessories with arbor holes
that do not match the mounting hardware of
the pow er too l will run out of balance,
vibrate excessively and may cause loss of
control.
g) 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
wire s. I f power tool or acc essor y 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
sp eed for on e minut e. Damaged
accessories will normally break apart during
this test time.
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h) Wear personal protective equipment.
Depe nding o n appli catio n, use f ace
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 eye
protection must be capable of stopping flying
debris generated by various operations. The
dust mask or respirator must be capable of
fi ltr ati ng par tic les ge nerated by your
operation. Prolonged exposure t o high
intensity noise may cause hearing loss.
i) 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.
j) Hold power tool by insulated gripping
su rfa ces only , w hen perf orming 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.
k) 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.
l) Never lay the power tool down until the
accessory has come to a complete stop.
The spin ning ac ces sory may grab the
surface and pull the power tool out of your
control.
m)Do not run the power tool while carrying
it at your side. Accidental contact with the
sp inn ing a cce sso ry could snag y our
clothing, pulling the accessory into your
body.
n) Regularly clean the power to ol ’s air
vents. The motor’s fan will draw the dust
in sid e the hou sin g and excessi ve
accumulation of powdered metal may cause
electrical hazards.
o) Do not ope rat e the pow er tool n ear
flammable materials. Sparks could ignite
these materials.
p) Do not use accessories that require
liquid coolants. Using water or other liquid
coolants may res ul t 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,
de pen din g o n dire cti on of th e w hee l’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 i ncorrec t op erating procedur es o r
conditions and can be avoided by taking proper
precautions as given below.
a) Maintain a firm grip on the power tool
and position your body and arm to allow
you to resist kickback forces. Always use
au xil iar y hand le, if prov ide d, for
ma xim um control ov er kic kback o r
torque re action during start-up. The
operator can control torque reactions or
kickback forces, if proper precautions are
taken.
b) Never place your hand near the rotating
accessory. Accessory may kickback over
your hand.
c) 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.
d) 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.
e) 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:
a) Us e o nly whe el t ype s th at are
recommended for your power tool and
the sp eci fic gua rd designed for the
selected wheel. Wheels for which the
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power tool was not designed cannot be
adequately guarded and are unsafe.
b) The guard must be securely attached to
th e 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 and accidental
contact with wheel.
c) Wh eel s must be us ed onl y f or
re com men ded ap pli cat ion s. 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.
d) Always use undamaged wheel flanges
that are of correct size and shape for
your selected wheel. Proper wheel flanges
su ppo rt the wh eel th us red uci ng the
possibility of wheel breakage. Flanges for
cut-off wheels may be different from grinding
wheel flanges.
e) Do not use worn down wheel s fr om
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 attempt to cut large stock or sheets
of metal as this machine is not designed to
be a dedicated cut-off machine.
a) Do not “jam” the cut-off wheel or apply
excessive pressure. Do not attempt to
ma ke an e xcessive de pth o f cut.
Overstressing the whee l increas es the
loading and susceptibility to twisting or
binding of the wheel in the cut and the
possibility of kickback or wheel breakage.
b) 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.
c) Wh en whe el is bind ing or whe n
interrupting a cut for any reason, switch
off the power tool and hold the power
tool motionless until the wheel comes to
a co mpl ete stop. Neve r 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.
d) 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.
e) Su ppo rt panels or any over siz ed
workpiece to minimize the risk of wheel
pinching and kickback. Large workpieces
te nd to sag under thei r own weig ht.
Su ppo rts must be placed under t he
workpiece near the line of cut and near the
edge of the workpiece on both sides of the
wheel.
f) Us e ext ra caut ion w hen m aking a
“pocket cut” into existing walls or other
blind areas. The protruding wheel may cut
gas or water pipe s, electrical wiring or
objects that can cause kickback.
Do not use type 1 abrasive wheels designed
for straight grinding.
Safety Warnings Specific for Sanding
Operations:
a) Do not use excessively oversized sanding
di sc p ape r. F ollow manuf act ure r’s
re com men dat ion s, whe n se lec tin g
sanding paper. Larger sanding pap er
extending beyond the sanding pad presents
a lacer ati on ha zar d and may cau se
snagging, tearing of the disc or kickback.
Safety Warnings Specific for Wire Brushing
Operations:
a) Be aware that wire bristles are thrown by
th e br ush even dur ing o rdi nary
operation. Do not overstress the wires
by applying excessive load to the brush.
The wire bristles can easily penetrate light
clothing and/or skin.
b) If the use of a guard is recommended for
wi re brus hing , d o n ot a llo w 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.
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Additional Safety Warnings
GFCI and personal protection devices like
electrician’s rubber gloves and footwear will
further enhance your personal safety.
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 sup port t he wor kpiece to a sta ble
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 y our tool. When cl ea ning a tool be
careful not to disassemble any portion of
th e tool since internal wires may be
misplaced or pinched or safety guard return
sp rin gs may be imp rop erl y mounted.
Certain cleaning agents such as gasoline,
carb on t etrac hloride, ammonia, etc. may
damage plastic parts.
Risk of injury to user. The power cord must only
be serviced by a Bosch Factory Service Center
or Autho rized Bosch Service Station.
Us e hand gu ard w hen sanding and
brushing.
Do not use type 1 wheels for face grinding.
Side forces applied to type 1 wheels may cause
them to shatter or burst.
WARNING
!
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
• Arsen ic and chr omium from chemica ll ytreated lumber.
Yo u r r i sk f rom t hese exp o sure s va ries ,
depending on how often you do this type of
work . To redu ce your e xpo sure to t hese
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.
Some dust created by power
sanding, sawing, grinding,
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0
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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.
n
0
n Rated speed Maximum attainable speed
.../min Revolutions or reciprocation Revolutions, strokes, surface speed,
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
No load speed Rotational speed, at no load
per minute orbits etc. per minute
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
Li-ion RBRC seal Designates Li-ion battery recycling
program
Ni-Cad RBRC seal Designates Ni-Cad battery recycling
program
Read manual symbol Alerts user to read manual
Wear eye protection symbol Alerts user to wear eye protection
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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.
This symbol designates that this tool is listed by Underwriters Laboratories.
This symbol designates that this tool is recognized 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 Standards
Association.
This symbol designates that this tool is listed by the Canadian Standards
Association, to United States and Canadian Standards.
This symbol designates that this tool is listed by the Intertek Testing
Services, to United States and Canadian Standards.
This symbol designates that this tool complies to NOM Mexican Standards.
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Functional Description and Specifications
WARNING
!
measures reduce the risk of starting the tool accidentally.
Di scon n ect th e p l ug from th e p ower so urce be for e makin g any
assembly, adjustments or changing accessories. Such preventive safety
Angle Grinders
FIG. 1
GUARD
RELEASE / ADJUSTMENT
BUTTON
SPINDLE LOCK
VENTILATION
OPENINGS
PADDLE
SWITCH
GRINDING
WHEEL
WHEEL
GUARD
Model number 1821, 1821D
* Rated speed n 11,000/min
* Max. abrasive wheel diameter 5" (125 mm)
Spindle thread 5/8"-11 UNC
Max. spindle length 9/16"
Max. wire wheel 4" Dia.
Max. wire cup brush 3" Dia.
* Max. sanding disc 5" Dia.
VIBRATION
CONTROL
SIDE HANDLE
-9-
HAND GUARD
(Optional Accessory)
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Functional Description and Specifications (Continued)
Model number 1821, 1821D
Max. type 1 and 27 grinding wheels 5" Dia.
* Max. type 1A and 27A cutting wheel 5" Dia.
* Max. flap disc 5" Dia.
Accessory speed rating must be equal to or greater than the tool’s speed rating. Do not
NOTE: Not recommended for use with type 11 cup wheels.
* NOTE: For tool specifications refer to the nameplate on your tool.
exceed the recommended wheel diameter.
Assembly
WHEEL GUARD INSTALLATION
WARNING
!
grinding or cutting wheels. Always keep wheel
guard be tween you and your w ork w hile
grinding or cutting.
The position of the guard can be adjusted to
accommodate the operation being performed.
To attach wheel guard DISCONNECT tool
from power source.
Position wheel guard on spindle neck so that
the arrow on guard lines up with the arrow on
th e s pind le n eck. Rotat e w heel gu ard
clockwise 90º until it clicks in place (Fig. 2).
TO ADJUST GUARD: depress guard release
button (Fig. 1), rotate guard to desired position,
release button and let it click in place.
Wh eel gu ard must be
at tac hed w hen u sing disc
TO RE MOV E GUARD : De p res s relea se
button, rotate guard until arrow on guard lines
up with arrow on spindle neck, and remove
guard from spindle neck.
FIG. 2
WHEEL
GUARD
SPINDLE
NECK
LOCK NUT AND BACKING FLANGE
Your tool is equipped with a threaded spindle
for mounting ac ces sories. Always use the
supplied lock nut (and backing flange) that
has same thread size as spindle.
VIBRATION CONTROL SIDE HANDLE
The side handle is used to control and balance
the tool. The handle must be thread ed into the
fr ont ho usin g on eith er side o f t he tool ,
de pend ing on pe r s onal pr efe renc e and
comfort. Use the side handle for safe control
and ease of operation (Fig. 1).
The hand guard is to be used with backing
OPTIONAL HAND GUARD
pads, sanding discs and wire brushes to keep
fingers and hand away from work surface,
sharp edges, burrs and debris. When using the
optional hand guard accessory insert side
handle through hole in guard and then thread
into housing (Fig. 1).
Ensure that hand guard is positioned between
hand and backing pad, sanding disc or wire
brush.
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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 nut using the supplied lock nut wrench,
while holding the spindle lock in (Fig. 3).
TO REMOVE: Reverse procedure.
When using spin-on wheels, thread directly
onto the spindle.
TYPE 27
GRINDING
WHEEL
SPINDLE
BACKING
FLANGE
LOCK NUT
ABRASIVE TYPE 1A & 27A
WHEEL ASSEMBLY
Using the optional type 1A wheel guard, 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 1A protection
guard for cutting.
Disconnect tool from power source. Be sure
that wheel guard is in place for cutting.
Whe n us i n g m o u n t i ng w h e els, t hread
BACKING FLANGE onto spindle, then place
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 (Fig. 4).
TO REMOVE: Reverse procedure.
TYPE 1 ABRASIVE
STRAIGHT GRINDING WHEELS
WARNING
!
Do not use type 1 abrasive
wh eels d esig ned f or
st raig ht/ d ie gr indi ng. Th is too l i s not
desi gned for use wit h type 1 a brasi ve
straight/die grinding wheels.
-11-
FIG. 3
TYPE 27
GRINDING
WHEEL
LOCK NUT
FIG. 4
TYPE 1A
(ISO41)
CUTTING
WHEEL
SPINDLE
TYPE 27
WHEEL GUARD
BACKING
FLANGE
TYPE 27 SPIN-ON
GRINDING WHEEL
SPINDLE
TYPE 1A
WHEEL GUARD
BACKING
FLANGE
LOCK NUT
TYPE 27A
CUTOFF
WHEEL
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SANDING ACCESSORIES ASSEMBLY
WARNING
!
safe operating speed is not exceeded by the
nameplate speed of the tool.
WARNING
!
operatio ns. Always reinstall whe el gua rd
when converting back to grinding operations.
TO INSTALL BACKING PAD AND
Disconnect tool from power source.
Attach hand guard (Fig. 1). Set the tool on its
to p si d e ( s pind l e up ). P lace the rub b er
backing pad onto the spindle shaft. Center
the sanding disc on top of the backing pad.
In ser t the lock nut thr oug h 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. 5).
TO REMOVE: Reverse procedure.
Before assembling wire brush to this tool,
disconnect from the power source. Attach
han d guard ( F i g . 1) . Wire b r u s h es ar e
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.
BACKING PAD
Before attaching a backing
pa d b e s u re its max imum
Whe e l guard m a y not be
use d for most sanding
SANDING DISC
WIRE BRUSH ASSEMBLY
FIG. 5
SPINDLE
BACKING
PAD
SANDING
DISC
LOCK NUT
WIRE
BRUSH
WIRE WHEEL ASSEMBLY
Before assembling wire wheel to this tool,
disconnect from the power source. Attach type
27 guard (Fig. 2). Wire wheeels 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.
MASONRY CUTTING WHEEL ASSEMBLY
Di s conn e ct pl ug fr o m po w er so urce.
Completely unscrew the four screws and
rotate the t ool head careful ly to the new
position without removing it from the housing.
For paddle switch tools, switch should face
“down” towards work surface. For slide switch
tools, slide should face “up” towards user, so
the tool can be used for long masonry cutting
applications. Screw in and tighten the four
screws again. (Fig. 6)
WARNING
!
grinding, sanding, brushing or metal cutting
applications.
FIG. 6
Return tool head to original
positi on w hen returni ng to
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BM 1609929Y07 10-10:BM 1609929Y07 10-10 1/18/11 10:06 AM Page 13
Install dust extraction guard with foot plate for
maso nry c utting app lication s so that t he
rotation of the wheel wil l be towards the
vacuum extraction port. Place BACKING
FLANGE and DRY DIAMOND WHEEL on the
spindle. Thread on the LOCK NUT and tighten
nut using the supplied lock nut wrench, while
holding the spindle lock in. (Fig. 7)
FIG. 7
SPINDLE
DRY
DIAMOND
WHEEL
LOCK
NUT
BACKING
FLANGE
Operating Instructions
!
WARNING
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.
"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 s witch, is a conve nience for long
operations.
Hold the tool with both hands
while starting the tool, since
(Models 1821 only)
WARNING
!
WARNING
!
cutting.
DRY
DIAMOND
WHEEL
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
lo ade d and will r eturn to "OFF" p osi tio n
automatically.
The Paddle switch enables the operator to
control the switch functions of "Lock-OFF",
and "ON/OFF".
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.
Use only lock nut and flange
with equal diameters.
Do not u se water or o ther
cooling fluid with this tool for
SPINDLE
BACKING
FLANGE
LOCK NUT
PADDLE SWITCH WITH
"LOCK-OFF "FEATURE
(Model 1821D only
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BM 1609929Y07 10-10:BM 1609929Y07 10-10 1/18/11 10:06 AM Page 14
Grinding Operations
SELECTING GRINDING WHEELS
!
WARNING
ma ximu m safe opera ting s peed is not
exceeded by the nameplate speed of the
grinder. Do not exceed the recom mended
wheel diameter.
Grinding wheels should be carefully selected in
order to u se t he grinder most efficientl y.
Wh eels vary in type of ab rasi ve, 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
struct ural steel, heavy weld beads, steel
casting, st ai nl es s steel a nd other ferrous
metals.
Efficient grinding is achieved by controlling the
pressure an d keep ing 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
sm all are a ca usi ng b urni ng t o the w ork
surface.
Be fore using a grind ing
wh eel, be ce rta in th at its
DISC GRINDING WHEELS
GRINDING TIPS
Always follow precautions for kickback.
Do not apply side pressure to cutting wheel
to reduce wheel speed.
Th e tool shou ld alw ays be u sed so t hat
sparks are directed away from user.
Operate the tool only with dust extraction and
additionally wear a dust protection mask. The
vacuum used for this application must be
approved for the extraction of masonry dust.
Bosch sells suitable vacuum cleaners.
!
plate. The tool may be used only for dry
cutting. When cutting masonry use a dry
diamond wheel.
Always cut towards the dust extraction port
(Fig. 8).
FIG. 8
CUTTING MASONRY
WARNING
When cutting masonry always
use dust extraction with foot
WARNING
!
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.
Using the optional type 1A wheel guard, it is
possible to perform limited cutting on small
stock such as metal tubes, piping or rebar.
When cutt ing , work w ith m ode rat e fee d,
adapted to the material being cut. Do not
exert side pressure onto the cutting disc, tilt
or oscillate the tool. When cutting profiles
and squar e bar , it is best to sta rt at the
smallest cross section.
Excessive or sudden pres-
sure on the wheel will slow
CUTTING METAL
Turn the tool on and place the front part of the
cutting guide on the workpiece. Slide the tool
with moderate rate of feed, adapted to the
material to be cut.
When doing deep cuts, it is best to cut in
several shallow passes.
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 time at maximum speed
with no load.
Noticeable decreasing work progress and
circul ar s parking are ind ications of a dry
diamond wheel that has become dull. Briefly
cutting into abrasive materials (e. g. brick) can
resharpen the wheel again.
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BM 1609929Y07 10-10:BM 1609929Y07 10-10 1/18/11 10:06 AM Page 15
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 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.
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 t oo great a nd a roug h cut surf ace o r
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
wa x and greas e. By do ing 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.
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BM 1609929Y07 10-10:BM 1609929Y07 10-10 1/18/11 10:06 AM Page 16
Wire Brush Operations
Wire brushes are intended to “clean” structural
st eel, cast ing s , sh eet meta l, stone and
concrete. They are used to remove rust, scale
and paint.
!
WARNING
when working corners, sharp edges etc. This
can cause loss of control and kick-back.
!
WARNING
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.
CORRECT:
Wire tips doing
the work.
CORRECT:
Wire tips doing
the work.
Avoid bouncing and snagging
th e wir e brush, espe cia lly
Be aware that wire bristles
are thrown by the brush
WIRE WHEEL BRUSH
WIRE CUP BRUSH
1. Remember, the tips of a wire brush do the
BRUSHING PRESSURE
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
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
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.
INCORRECT:
Excessive
pressure can
cause wire
breakage.
INCORRECT:
Excessive
pressure can
cause wire
breakage.
Maintenance
Service
!
WARNING
per so n n el m ay r esult 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 Autho rized Bosch
Service Station.
Your Bosch tool has been properly lubricated
and is ready to use. It is recommended that
tools with gears be regreased with a special
gear lubricant at every brush change.
Pr even tive ma inte nanc e
performed by unauth-orized
TOOL LUBRICATION
The brushes and commutator in your tool have
CARBON BRUSHES
be en eng inee red fo r many h our s of
de pend able serv ice. T o mai ntai n pea k
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 Au thorized Bosch Service Station.
Bearings which become noisy (due to heavy
load or very abrasive material cut ting) should
be replaced at once to avoid overheating or
motor failure.
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