Bosch 1274DVS User Manual
Operating/Safety Instructions
Consignes de fonctionnement/sécurité
Instrucciones de funcionamiento
y seguridad
IMPORTANT: IMPORTANT : IMPORTANTE:
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Consumer Information
Renseignement des consommateurs
Información para el consumidor
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1274DVS
Read and understand all instructions. Failure to follow all instructions
listed below, may result in electric shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
-2-
Work Area
Keep your work area clean and well lit.
Cluttered benches and 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 by-standers, children, and visitors
away while operating a power tool.
Distractions can cause you to lose control.
Electrical Safety
Double Insulated tools are equipped with
a polarized plug (one blade is wider than
the other.) This plug will fit in a polarized
outlet only one way. If the plug does not
fit fully in the outlet, reverse the plug. If it
still does not fit, contact a qualified
electrician to install a polarized outlet. Do
not change the plug in any way. Double
Insulation eliminates the need for the
three wire grounded power cord and
grounded power supply system. Before
plugging in the tool, be certain the outlet
voltage supplied is within the voltage marked
on the nameplate. Do not use “AC only”
rated tools with a DC power supply.
Avoid body contact with grounded surfaces
such as pipes, radiators, ranges and
refrigerators. There is an increased risk of
electric shock if your body is grounded. If
operating the power tool in damp locations is
unavoidable, a Ground Fault Circuit Interrupter
must be used to supply the power to your
tool. Electrician’s rubber gloves and footwear
will further enhance your personal safety.
Don't 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
to carry the tools or pull the plug from an
outlet. Keep cord away from heat, oil, sharp
edges or moving parts. Replace damaged
cords immediately. Damaged cords increase
the risk of electric shock.
When operating a power tool outside, use
an outdoor extension cord marked "W-A"
or "W." These cords are rated for outdoor use
and reduce the risk of electric shock. Refer to
“Recommended sizes of Extension Cords” in
the Accessory section of this manual.
Personal Safety
Stay alert, watch what you are doing and
use common sense when operating a
power tool. Do not use tool while tired or
under the influence of drugs, alcohol, or
medication. A moment of inattention while
operating power tools may result in serious
personal injury.
Dress properly. Do not wear loose clothing
or jewelry. Contain long hair. Keep your
hair, clothing, and gloves away from
moving parts. Loose clothes, jewelry, or long
hair can be caught in moving parts. Keep
handles dry, clean and free from oil and
grease.
Avoid accidental starting. Be sure switch is
“OFF” before plugging in. Carrying tools with
your finger on the switch or plugging in tools
that have the switch “ON” invites accidents.
Remove adjusting keys or wrenches before
turning the tool “ON”. A wrench or a key that
is left attached to a rotating part of the tool
may result in personal injury.
Do not overreach. Keep proper footing and
balance at all times. Proper footing and
balance enables better control of the tool in
unexpected situations.
Use safety equipment. Always wear eye
protection. Dust mask, non-skid safety
shoes, hard hat, or hearing protection must be
used for appropriate conditions.
Tool Use and Care
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.
Do not force tool. Use the correct tool for
your application. The correct tool will do the
!
WARNING
Power Tool Safety Rules
-3-
Belt Sander Safety Rules
job better and safer at the rate for which it is
designed.
Do not use tool if switch does not turn it
“ON” or “OFF”. Any tool that cannot be
controlled with the switch is dangerous and
must be repaired.
Disconnect the plug from the power source
before making any adjustments, changing
accessories, or storing the tool. Such
preventive safety measures reduce the risk of
starting the tool accidentally.
Store idle tools out of reach of children and
other untrained persons. Tools are
dangerous in the hands of untrained users.
Maintain tools with care. Keep cutting tools
sharp and clean. Properly maintained tools,
with sharp cutting edges are less likely to bind
and are easier to control. Any alteration or
modification is a misuse and may result in a
dangerous condition.
Check for misalignment or binding of
moving parts, breakage of parts, and any
other condition that may affect the tools
operation. If damaged, have the tool
serviced before using. Many accidents are
caused by poorly maintained tools. Develop a
periodic maintenance schedule for your tool.
Use only accessories that are
recommended by the manufacturer for
your model. Accessories that may be suitable
for one tool, may become hazardous when
used on another tool.
Service
Tool service must be performed only by
qualified repair personnel. Service or
maintenance performed by unqualified
personnel could result in a risk of injury. For
example: internal wires may be misplaced or
pinched, safety guard return springs may be
improperly mounted.
When servicing a tool, use only identical
replacement parts. Follow instructions in
the Maintenance section of this manual.
Use of unauthorized parts or failure to follow
Maintenance Instructions may create a risk of
electric shock or injury. Certain cleaning
agents such as gasoline, carbon tetrachloride,
ammonia, etc. may damage plastic parts.
Hold tool by insulated gripping surfaces
when performing a operation where the
cutting tool 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.
If your tool is equipped with a dust bag,
empty it frequently and after completion
of sanding. Be extremely careful of dust
disposal, materials in fine particle form may
be explosive. Do not throw sanding dust on
an open fire. Spontaneous combustion, may
in time, result from mixture of oil or water
with dust particles.
Use special precautions when sanding
chemically pressure treated lumber, paint
that may be lead based, or any other
materials that may contain carcinogens. A
suitable breathing respirator and protective
clothing must be worn by all persons 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.
Do not wet sand with this sander. Liquids
entering the motor housing is an electrical
shock hazard.
Never leave the trigger locked “ON”.
Before plugging the tool in, check that the
trigger lock is “OFF”. Accidental start-ups
could cause injury.
Unplug the sander before changing
accessories. Accidental start-ups may
occur if sander is plugged in while changing
an accessory.
Keep your fingers and clothing away from
the belt. They could get cut or wedged
between the pulley, belt and motor housing.
Properly adjust tracking of belt to avoid it
overhanging the housing. A running belt
overhanging its housing can cause severe
lacerations.
Be aware of the location and setting of
the Switch "Lock-ON" Button. If the switch
is locked "ON", be ready for emergency
situations to switch it "OFF", by first pulling
the trigger then immediately releasing it
without pressing the "Lock-ON" button.
Keep the cord to the side away from
pulleys. The cord can be dragged into belt
housing and become entangled with the
pulleys.
Clamp or secure workpiece when
sanding. Clamping the workpiece prevents
it from being ejected from under the sander
and leaves both hands to control the tool.
Clamp or secure sander if it is inverted
and bench mounted for use as a table
sander. Always use edge stop or guide
when sanding short or small workpieces.
Fingers or clothing can be dragged into
pulley and housing area.
Portable belt sanders are not intended to be
permanently mounted as a bench or table
sander. There are accessories available
which can convert certain portable belt
sanders for occasional stationary use. If such
accessories are used always clamp or secure
sander when inverted and bench mounted
for use as a table sander. Be aware of switch
location and know how to shut off the tool in
emergency situations. Always follow
directions included with the accessory. Use
sanding fence, stop or guide when sanding
short or small workpieces.
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.
-4-
!
WARNING
-5-
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
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
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
Symbols
0
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
complies
to NOM
Mexican
Standards.
This symbol designates
that this tool is listed by
Underwriters Laboratories,
and listed to Canadian
Standards by Underwriters
Laboratories.
-6-
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.
!
WARNING
Belt Sander
Model number 1274DVS
Voltage rating 120 V 50 - 60Hz
Amperage rating 6.6 A
No load speed n
0
550-1,100/min
Belt size 3" x 21"
FIG. 1
DUST
BAG
VARIABLE
SPEED TRIGGER
SWITCH
SUPPORT
ARM
RUBBER ADAPTOR
VARIABLE
SPEED
DIAL
DUST BAG HOLDER
ANGLE
ADAPTOR
DUST PORT
MOTOR
VENTILATION
SLOTS
SCREW
AUXILIARY
HANDLE
BELT TENSION
RELEASE
LEVER
"LOCK-ON"
BUTTON
Operating Instructions
-7-
REMOVING AND INSTALLING
SANDING BELTS
To prevent personal injury,
always disconnect the plug
from the power source before removing or
installing the belt.
TO REMOVE BELT:
1. Place sander upside down and move belt
tension release lever in direction of arrow to
retract front pulley and release belt tension.
2. With the sander upside down and the open
side facing you, you can easily remove the
belt.
TO INSTALL BELT:
1. While the sander is still upside down, with
the front pulley retracted and locked, insert the
new belt around both pulleys and over the
platen plate. If the sanding belt has "rotation
direction" markings, be sure the arrow on the
inside of belt is pointing in the direction of
rotation as indicated on housing.
2. Then push lever back to its original position
to return tension to the belt.
VARIABLE SPEED CONTROLLED
TRIGGER SWITCH
Your sander is equipped with a variable speed
trigger switch. The sander can be turned “ON”
or “OFF” by squeezing or releasing the trigger.
The speed can also be adjusted from,
miminum to maximum nameplate rated RPM
by the amount of pressure you apply on the
trigger. Apply more presssure to increase
speed and release pressure to decrease
speed.
The “Lock-ON” button, located near the trigger
allows continuous operation at maximum RPM
without holding the trigger.
TO LOCK TRIGGER ON: Squeeze trigger,
depress button and release trigger.
TO UNLOCK THE TRIGGER: Squeeze trigger
and release it without depressing the “LockON” button.
If the “Lock-ON” button
is continuously being
depressed, the trigger cannot be released.
VARIABLE SPEED DIAL
This feature enables you to preset the trigger
at desired speeds by rotating the dial on the
trigger. Regardless of the pressure applied on
trigger, the tool will not operate any faster than
maximum preset speed. You can change the
preset maximum speed simply by rotating the
adjusting dial to a higher or lower speed
setting. As a guideline, the following speed
selections apply:
Dial setting Material/Application
A thru C Delicate surfaces, veneers,
and with sanding frame for
light surface finishing
B thru D Plastics or other surfaces
where belt loading or heat
buildup is a problem
C thru E Solid wood, fast stock
removal, paint removal
E General service, metal
sanding, chipboard, coarse
sanding on rough surfaces
Assembly
!
WARNING
DIRECTION
OF ROTATION
FRONT
PULLEY
REAR
PULLEY
BELT TENSION
RELEASE LEVER
PLATEN
PLATE
!
WARNING
“LOCK-ON”
BUTTON
VARIABLE
SPEED TRIGGER
SWITCH
VARIABLE
SPEED DIAL
Sanding Tips
SELECTING THE SANDING BELT
It is very important that you select the proper
belt for each particular application. To do this
you should understand the method of marking
or coding on the back of most belts. “CLOSED
COAT” means the surface is densely covered
with as much grit as the adhesive will hold.
“OPEN COAT” means the grit has been
applied evenly, but openly to the surface. An
“open coat” will not clog or fill as readily as
“closed coat”. In general, aluminum oxide
abrasive belts are best for woodworking
because they are tougher and last longer.
Sanding belts should be stored in a cool, dry
place. Do not store near heat or near a window
where the sun can reach them.
TECHNIQUE
Grasp the handles firmly. Start the sander with
the belt off the work (NOTE: never start or stop
the tool with the belt in contact with the work
surface). Place the heel of the sander on the
work first. Then, with a forward motion, begin
the sanding stroke as the machine is lowered
onto the work surface. This will prevent
-8-
TRACKING ADJUSTMENT
Turn sander upside down and hold it firmly
with one hand, start motor and observe the
tracking of sanding belt. If the belt runs
outward, turn tracking adjustment knob
clockwise, if the belt runs inward turn knob
counter-clockwise.
Adjust the belt until the outer edge of the belt
is even with the outer edge of both front and
rear pulleys. Be sure the belt does not rub
against the guide strip. Once the belt
stabilizes you can begin operation. In some
cases, the belt will require a slight
readjustment after it is applied to the work
surface.
Note the tracking carefully during the first
minutes of operation and readjust as required.
ATTACHING AND REMOVING DUST BAG
Insert support arm into dust bag holder and
mount rubber adaptor onto angle adaptor To
attach dust bag, push angle adaptor onto dust
port as far as it will go (Fig. 1).
The dust bag can be emptied by removing the
dust bag from the angle adaptor and sliding
bag off support arm. For most efficient dust
pick-up, empty bag frequently. For added
efficiency, a vacuum hose and adaptor
(optional accessories) are available which will
allow your sander to be connected to a shop
vacuum system. See your Bosch catalog for
these optional Bosch Airsweep accessories.
FLUSH SANDING
Your sander has been designed to allow
convenient flush sanding on the right side of
the sander.
AUXILIARY HANDLE
Your sander is equipped with a removable
auxiliary handle when sanding in tight quarters.
To remove handle, remove screw in handle
and slide handle off sander in direction of
arrow. Always reinstall handle for normal
operation.
TRACKING
ADJUSTMENT
KNOB
SANDING
BELT
SCREW
AUXILIARY
HANDLE
-9-
gouging. Keep the sander moving so that your
work will be smooth and even. The stroke is
simply a back-and-forth movement with most
of the sanding done on the pull movement.
Use a light touch. The weight of the belt sander
is the only pressure required. Too much pressure will slow the work by overloading the
motor and reducing belt speed. The result will
be decreased sanding efficiency. Sand slowly
and systematically and, when you stop, lift the
sander from the surface before stopping the
tool.
WOOD FINISHING
Take care to select belts wisely. For initial
smoothing of rough lumber, use coarse or very
coarse grit and sand with the grain. On very
uneven or hard wood, sand diagonally (across
the grain). Be careful to avoid gouging. Now
switch to medium grit belt and sand with the
grain. This will provide a relatively level and
smooth finish. Now insert a fine grit belt for
final finishing. Always sand with the grain to
remove scratches left by coarser belts. Keep
the sander moving in long, light strokes during
finishing operations. As a final touch,
experienced sanders will often insert a “used”
fine belt to provide a smooth surface for filling,
sealing, brushing or spraying.
REFINISHING COATED WOOD
Your belt sander will also help remove old
paint, varnish or lacquer; however, if the
coating consists of several layers, remove as
much as possible with a paint solvent or
varnish remover before using the belt sander.
Use a hand scraper to remove the residue left
by the solvent and allow surface to dry
completely before sanding.
GUIDE FOR WOOD SANDING OPERATIONS
Abrasive Belt Material/Application
Open-coat Rough, fast stock
36 to 60 grit removal, removal of old
finishes
Open-coat Intermediate finishing
60 to 100 grit
Open or closed- Fine finishing
coat 120 to 180
grit
Open or closed- Extra-fine finishing,
coat, 200 or especially with hard
finer grit woods
Remove all sanding dust thoroughly before
coating. Use a soft brush or a vacuum cleaner
and hose to remove all dust from seams or
crevices.
For fast removal, start with a coarse grit, open
coat belt. Change to closed coat belts, using
medium grits as the material shows through
the coating. When the covering is thin, use
medium grit to avoid scratching the material.
Use short, light strokes, moving the sander
rapidly. Excessive pressure or steady sanding
in one place will burn the coating and load the
belt.
METAL FINISHING
For ferrous metals such as steel, stainless
steel, iron, etc., use coarse grit open coat belts
or coarse to fine grit closed coat belts,
depending on the finish desired. Non-ferrous
metals such as aluminum, solder, brass,
bronze, etc., can also be sanded. Beeswax or
tallow are recommended as lubricants for
metal sanding, polishing or satin finishing to
minimize belt loading and to lengthen belt life.
To use, simply rub the lubricant on the belt
from time to time. SAE No. 10 or 20 lubricating
oil can also be used to assure a smooth
scratch free surface. Just wipe the oil on the
surface prior to sanding.
-10-
Accessories
Service
Preventive maintenance
performed by unauthorized
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.
TOOL LUBRICATION
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.
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 brushes be examined.
Only genuine Bosch replacement 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
To avoid accidents always
disconnect the tool from
the power supply before cleaning or
performing any maintenance. The tool may
be cleaned most effectively with compressed
dry air. Always wear safety goggles when
cleaning tools with compressed air.
Ventilation openings and switch levers must
be kept clean and free of foreign matter. Do
not attempt to clean by inserting pointed
objects through openings.
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.
!
WARNING
!
WARNING
Maintenance
!
CAUTION
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 3wire extension cords that have 3-prong
plugs and receptacles.
NOTE: The smaller the gauge number, the
heavier the cord.
RECOMMENDED SIZES OF EXTENSION CORDS
120 VOLT ALTERNATING CURRENT TOOLS
!
WARNING
Tool’s
Ampere
Rating
Cord Size in A.W.G.
Wire Sizes in mm
2
3-6
6-8
8-10
10-12
12-16
18 16 16 14 .75 .75 1.5 2.5
18 16 14 12 .75 1.0 2.5 4.0
18 16 14 12 .75 1.0 2.5 4.0
16 16 14 12 1.0 2.5 4.0 —
14 12 — — — — — —
25 50 100 150 15 30 60 120
Cord Length in Feet Cord Length in Meters
* Cloth dust bag assembly
* Sanding belt
** Vacuum hose
** Hose/Vacuum adaptor
(*= standard equipment)
(**= optional accessories)
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