BOSCH 3915 User guide
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3915
Operating/Safety Instructions
Consignes de fonctionnement/sécurité
Instrucciones de funcionamiento y seguridad
Consumer Information
Renseignement des consommateurs
Información para el consumidor
Toll Free Number: Appel gratuit : Número de teléfono gratuito:
1-877-BOSCH99 (1-877-267-2499) http://www.boschtools.com.
IMPORTANT: IMPORTANT : IMPORTANTE:
Read Before Using Lire avant usage Leer antes de usar
General Safety Rules
For Bench T op T ools
Work Area
● Keep 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 bystanders, children and visitors away
while operating a power tool. Distractions
can cause you to lose control.
● Store idle tools out of reach of children and
other untrained persons. Tools are dangerous in the hands of untrained users.
● Do not leave tool running unattended, turn
power off. Do not leave tool until it comes to a
complete stop.
● MAKE WORKSHOP CHILDPROOF with pad
lock, master switches, or by removing starter
keys.
Electrical Safety
● Before plugging in the tool, be certain the
outlet voltage supplied is compatible with
the voltage marked on the nameplate within
10%. An outlet voltage incompatible with that
specified on the nameplate can result in serious
hazards and damage to the tool.
● 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.
● 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.
● 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
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.
Personal Safety
● Stay alert, watch what you are doing and use
common sense when operating a power
tool. A moment of inattention or use of dr ugs,
alcohol or medication while operating power
tools can be dangerous.
● 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. Roll long sleeves
above elbows. Rubber gloves and non-skid
footwear are recommended when working outdoors.
● Avoid accidental starting. Be sure switch is
“OFF” before plugging in. Carr ying 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 will
be thrown.
● Do not overreach, keep proper footing and
balance at all times. Proper footing and balance enables better control of the tool in unexpected situations.
● Do not stand on tool or its stand. Serious
injury may occur if the tool is tipped or if the cutting tool is accidentally contacted. Do not store
materials on or near the tool such that it is necessary to stand on the tool or its stand to reach
them.
“SA VE THESE INSTR UCTIONS”
2.
Safety
“READ ALL INSTRUCTIONS” — Failure to follow the SAFETY RULES identified by
BULLET (●) symbol listed BELOW and other safety precautions, may result in serious personal injury.
WARNING
“SA VE THESE INSTR UCTIONS”
3.
● Use safety equipment. Always wear safety
goggles. Dust mask, safety shoes, hard hat or
hearing protection must be used for appropriate
conditions. Everyday eyeglasses only have
impact resistant lenses, they are NOT safety
glasses.
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. It allows for work to shift,
causes binding of the tool and loss of control.
● Do not force tool. Use the correct tool for
your application. The correct tool will do the
job better and safer at the rate for which it is
designed. Do not use the tool for purpose not
intended - for example;do not use the miter saw
for slicing meats.
● Do not use tool if switch does not turn it
“ON” or “OFF”. Any tool that cannot be controlled with the switch is dangerous.
● Disconnect the plug from the power source
before making any adjustments or changing
accessories. Such preventive safety mea-
sures reduce the risk of starting the tool accidentally.
● Keep cutting tools sharp and clean. Properly
maintained tools, with sharp cutting edges, are
less likely to bind and easier to control. When
mounting saw blades be certain that the arrow
on the blade matches the direction of the arrow
marked on the tool and that the teeth are also
pointing in the same direction.
● Inspect guards before using a tool. Keep
guards in place. Check moving parts for
binding or any other condition that may
affect the normal operation or safety features of the tool. If damaged, have tool serviced before using the tool. Many accidents
are caused by poorly maintained tools.
● Do not alter or misuse tool. Any alteration or
modification is a misuse and may result in serious personal injury.
● The use of any other accessories not speci-
fied in this manual may create a hazard.
Accessories that may be suitable for one type of
tool, may become hazardous when used on an
inappropriate tool.
Service
● Tool service must be performed only by
qualified repair personnel. Service or maintenance performed by unqualified personnel may
result in misplacing internal wires and components which could cause serious hazard.
● 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 hazard.
Safety Rules
For Miter Saws
● Use clamps to support workpiece whenever
possible. If supporting the workpiece by
hand, you must always keep hand outside of
“No Hand” area as marked with a symbol on
the base. Do not use this saw to cut pieces
that are too small to be securely clamped.
Your hand if placed inside the “No Hands”
region can easily slip or be pulled into the blade.
● Do not reach in back of the saw blade
behind the fence with either hand to hold
down or support the workpiece, remove
wood scraps, or for any other reason. The
proximity of the spinning saw b lade to your hand
may not be obvious and you may be seriously
injured.
● Never cross your hand over intended line of
cutting. Supporting the workpiece “cross handed” i.e. holding the left side of the workpiece
with your right hand is very dangerous.
● Always disconnect the power cord from the
power source before making any adjustments or attaching any accessories. You
may unintentionally start the saw, leading to
serious personal injury.
● Miter saws are intended to cut wood or
woodlike products,they cannot be used with
abrasive cutoff wheels for cutting ferrous
material such as bars, rods, studs, etc.
However, if cutting materials like aluminum
or other non-ferrous metals, use only saw
blades specifically recommended for nonferrous metal cutting. Cutting ferrous materi-
als causes excessive sparking and will damage
the lower guard and will overload the motor.
(NOTE: S-B Power Tool Company does not
offer 10” metal cutting blades.)
Safety
“READ ALL INSTRUCTIONS” — Failure to follow the SAFETY RULES identified by
BULLET (●) symbol listed BELOW and other safety precautions, may result in serious personal injury.
WARNING
“SA VE THESE INSTRUCTIONS”
4.
● Inspect your workpiece before cutting. If
workpiece is bowed or warped, clamp it with
the outside bowed face toward the fence.
Always make certain that there is no gap between the workpiece, fence and table along
the line of the cut. Bent or warped workpieces
can twist or rock and may cause binding on the
spinning saw blade while cutting. Also, make
sure there are no nails or foreign objects in the
workpiece.
● Do not use the saw until the table is clear of
all tools, wood scraps,etc., except the workpiece. Small debr is or loose pieces of wood or
other objects that contact the revolving blade
can be thrown with high speed at the operator.
● Do not feed workpiece into the blade or cut
“freehand” in any way. Workpiece must be
stationary and clamped or braced by your
hand. Saw must be fed through the workpiece
smoothly and at a rate which will not overload
the saw’s motor.
● Cut only one workpiece at a time. Multiple
workpieces cannot be adequately clamped or
braced and may bind on the blade or shift during cutting.
● Be certain the miter saw is mounted or
placed on a level, firm work surface before
using. A level and firm work surface reduces
the risk of the miter saw becoming unstable.
● Plan your work. Provide adequate support
accessories such as tables, saw horses,
table extension, etc. for workpieces wider or
longer than the table top (see page 20).
Workpieces longer or wider than the miter saw
table can tip if not securely supported. If the
cutoff piece or workpiece tips it can lift the lower
guard or be thrown by the spinning blade.
● Do not use another person as a substitute
for a table extension or as additional support. Unstable support for the workpiece can
cause the blade to bind or the workpiece to shift
during the cutting operation pulling you and the
helper into the spinning blade.
● The cutoff piece must not be jammed
against or pressured by any other means
against the spinning saw blade. If confined,
i.e. using length stops, it could get wedged
against the blade and thrown violently.
● Always use a clamp or a fixture designed to
properly support round material such as
dowel rods, or tubing. Rods have a tendency
to roll while being cut, causing the blade to “bite”
and pull the work with your hand into the blade.
● When cutting irregularly shaped work-
pieces, plan your work so it will not slip and
pinch the blade and be torn from your hand.
A piece of molding, for example, must lie flat or
be held by a fixture or jig that will not let it twist,
rock or slip while being cut.
● Let the blade reach full speed before con-
tacting the workpiece. This will help avoid
thrown workpieces.
● If the workpiece or blade becomes jammed
or bogged down, turn miter saw “OFF” by
releasing switch. Wait for all moving parts
to stop and unplug the miter saw, then work
to free the jammed material. Continued saw-
ing with jammed workpiece could cause loss of
control or damage to compound miter saw.
● Braking action of the saw causes the saw
head to jerk downward. Be ready for this
reaction when making an incomplete cut or
when releasing the switch before the head is
completely in the down position.
● After finishing the cut, release the switch,
hold the saw arm down and wait for blade to
stop before removing work or cutoff piece.
If blade does not stop within five (5) seconds, unplug the saw and follow the instructions in the Troubleshooting section.
REACHING WITH YOUR HAND UNDER A
COASTING BLADE IS DANGEROUS!
● There are additional safety instructions
for particular operations of the saw in the
operating section. Read the rest of the manual for safe operation.
● For slide action cutting, first PULL saw head
assembly away from the fence, until blade
clears the workpiece or to its maximum
extension if blade cannot clear the workpiece. Make certain the clamp does not interfere with the guard and head assembly.
Second, turn saw “ON” and lower the saw to
the table.Then PUSH saw through the workpiece. Release the switch and wait for the
blade to completely stop before raising the
head assembly and removing the workpiece.
Never “pullcut” since blade may climb the workpiece causing KICKBACK.
● For chop action cutting, slide the head
assembly to the rear as far as it will go and
tighten slide lock knob. Then turn the saw
“ON” and lower the head assembly to make
the cut. Release the switch and wait for the
blade to completely stop before raising the
head assembly and removing the workpiece.
Failure to tighten the slide lock knob can cause
the blade to suddenly climb up on the top of the
workpiece and force itself toward you.
Safety
“READ ALL INSTRUCTIONS” — Failure to follow the SAFETY RULES identified by
BULLET (●) symbol listed BELOW and other safety precautions, may result in serious personal injury.
WARNING
5.
“SA VE THESE INSTRUCTIONS”
● Do not allow familiarity gained from frequent
use of your miter saw to become commonplace. Always remember that a careless frac-
tion of a second is sufficient to inflict severe
injury.
● THINK SAFETY! SAFETY IS A COMBINATION
OF OPERATOR’S COMMON SENSE, KNOWLEDGE OF THE SAFETY AND OPERATING
INSTRUCTIONS AND ALERTNESS AT ALL
TIMES WHEN THE MITER SAW IS BEING
USED.
THE WARNINGS SHOWN
BELOW CAN BE FOUND ON YOUR TOOL.THESE
WARNINGS ARE ONLY A CONDENSED FORM OF
THE MORE DETAILED SAFETY RULES AND PRECAUTIONS THAT APPEAR IN YOUR OWNER'S
MANUAL.THEY SERVE AS A REMINDER OF ALL
SAFETY RULES NEEDED FOR SAFE OPERATION
OF THIS MITER SAW.
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.
WARNING
WARNING
10-41
KEEP GUARDS IN PLACE.
RETURN GUARD TO OPERATING
POSITION AFTER CHANGING THE BLADE.
IF GUARD FAILS TO WORK SMOOTHLY, STOP
SAWING AND SERVICE IT BEFORE PROCEEDING.
WARNING
DESIGNATED DANGER ZONE.
AVOID POSITIONING HANDS,
FINGERS OR ARMS IN THE
AREA DESIGNATED BY THIS
SYMBOL.
10" (254mm) SLIDE COMPOUND MITER SAW
120 VOLTS AC ONLY TO 60 Hz
13 AMPS 4700 RPM
DOUBLE INSULATED
SN.
3915
READ AND UNDERSTAND
THE OWNER'S MANUAL
BEFORE USING THIS TOOL.
ALWAYS WEAR SAFETY GOGGLES.
TO AVOID ELECTRICAL SHOCK DO NOT EXPOSE
SAW TO RAIN OR USE IN DAMP LOCATIONS.
USE SAW BLADE RATED 6000 RPM OR GREATER.
DISCONNECT SAW FROM POWER SOURCE
BEFORE SERVICING OR CHANGING BLADE.
WHEN SERVICING USE ONLY IDENTICAL
REPLACEMENT PARTS.
S–B Power Tool Co. Chicago, IL Made in Taiwan
LR61595
*
R
LISTED 407J
R
R
WARNING
BOSCH
511
0 601 475 035
WARNING
PULL saw carriage away from
the fence, until blade clears
the workpiece or to its maximum extension if blade can
not clear the workpiece.
1.
Turn saw “ON” and lower the
saw to the table.
2.
PUSH saw thru the workpiece.
Never “pull-cut” since blade
may climb the workpiece
causing KICKBACK.
3.
FOR SLIDE ACTION CUTTING,
ALWAYS FOLLOW THESE
INSTRUCTIONS:
50
45
40
35
30
25
20
15
10
5
0
5
50
BOSCH
1
2
3
KEEP HANDS AT A SAFE DISTANCE FROM THE SAW BLADE.
NEVER CROSS YOUR HANDS WITH THE PATH OF SAW BLADE. DO NOT REACH
BEHIND, BENEATH OR IN FRONT OF THE BLADE.
CLAMP WORKPIECE AGAINST BASE AND FENCE. NEVER PERFOAM ANY
OPERATION FREEHAND.
ALL ELECTRIC BRAKE SAWS MAY, ON OCCASIONS, FAIL TO STOP THE BLADE.
AFTER TURNING SAW “OFF”, ALWAYS MAINTAIN SAW HEAD IN DOWN POSITION
AND WAIT FOR BLADE TO STOP BEFORE REMOVING CUTOFF PIECES OR
CLEANING THE TABLE.
WARNING
*
WARNING
EXTEND SLIDING
BASE WHEN
MAKING BEVEL
CUTS OR TABLE
IS TURNED TO
LEFT SIDE.
Safety
“READ ALL INSTRUCTIONS” — Failure to follow the SAFETY RULES identified by
BULLET (●) symbol listed BELOW and other safety precautions, may result in serious personal injury.
WARNING
6.
Double Insulated Tools
Double insulation is a design concept used in
electric power tools which eliminates the need for the
three wire grounded power cord and grounded power
supply system. It is a recognized and approved system by Underwriter’s Laboratories, CSA and Federal
OSHA authorities.
● Servicing of a tool with double insulation requires
care and knowledge of the system and should be
performed only by a qualified service technician.
● WHEN SERVICING, USE ONLY IDENTICAL
REPLACEMENT PARTS.
● POLARIZED PLUGS. Your tool is 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 the proper outlet.
To reduce the risk of electrical shock, do not
change the plug in any way.
Extension Cords
● Replace damaged cords immediately. Use of
damaged cords can shock, burn or electrocute.
● If an extension cord is necessary, a cord with
adequate size conductors should be used to prevent excessive voltage drop, loss of power or
overheating. The table shows the correct size to
use, depending on cord length and nameplate
amperage rating of tool. If in doubt, use the next
heavier gauge. Always use U.L. and CSA listed
extension cords.
RECOMMENDED SIZES OF EXTENSION CORDS
Tools 120 Volt A.C.Tools
Ampere Cord Length in Feet
Rating Cord Size in A.W.G.
25 50 100 150
3-6 18 16 16 14
6-8 18 16 14 12
8-10 18 16 14 12
10-12 16 16 14 12
12-16 14 12 N/A N/A
NOTE: The smaller the gauge number, the heavier
the cord.
Safety
“READ ALL INSTRUCTIONS” — Failure to follow the SAFETY RULES identified by
BULLET (●) symbol listed BELOW and other safety precautions, may result in serious personal injury.
WARNING
“SA VE THESE INSTRUCTIONS”
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
General Safety Rules For Bench Top Tools . . . . 2
Safety Rules For Miter Saws . . . . . . . . . . . . . 3-6
Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Requirements. . . . . . . . . . . . . . . . . . . 7
Getting To Know Your Miter Saw. . . . . . . . . . . 8-9
Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
Tools Needed For Assembly And Alignment . . 10
Unpacking and Checking Contents. . . . . . . . . 10
Installation and Removal of the Blade . . . . 11-12
Assembling Dust Elbow and Dust Bag . . . . . . 12
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 13-16
Blade Square To Table (90°). . . . . . . . . . . . . . 13
Blade 45° To The Table. . . . . . . . . . . . . . . . . . 14
Blade Square To Fence . . . . . . . . . . . . . . . . . 15
Miter Scale Indicator Adjustment . . . . . . . . . . 15
Kerf Insert . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Depth Stop Adjustment. . . . . . . . . . . . . . . . . . 16
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . 17-18
Mounting Applications . . . . . . . . . . . . . . . . . . 17
Basic Saw Operations. . . . . . . . . . . . . . . . . 19-22
Body and Hand Position. . . . . . . . . . . . . . . . . 19
Workpiece Support. . . . . . . . . . . . . . . . . . . . . 20
Switch Activation . . . . . . . . . . . . . . . . . . . . . . 21
Detent Override . . . . . . . . . . . . . . . . . . . . . . . 22
Sliding Base/Fence Extension . . . . . . . . . . . . 22
Saw Operations. . . . . . . . . . . . . . . . . . . . . . 23-30
Chop Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Slide Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Miter Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bevel Cut. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Compound Cuts . . . . . . . . . . . . . . . . . . . . . . . 25
Cutting Grooves (Dado Cut) . . . . . . . . . . . . . . 26
Cutting Base Molding . . . . . . . . . . . . . . . . . . . 27
Cutting Crown Molding . . . . . . . . . . . . . . . . . . 27
Special Cuts . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Maintenance and Lubrication . . . . . . . . . . . . . 31
Troubleshooting . . . . . . . . . . . . . . . . . . . . . 32-33
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table of Contents
Electrical Requirements
1. Connect this saw to a 120V, 15-amp branch circuit with a 15-amp time delay fuse or circuit
breaker . Using the wrong size fuse can damage
the motor.
2. Fuses may “blow” or circuit breakers may trip
frequently if motor is overloaded. Overloading
can occur if you feed the blade into the workpiece too rapidly or start and stop too often in
a short time.
3. Most motor troubles may be traced to loose or
incorrect connections, overload, low voltage
(such as small size wire in the supply circuit or
too overly long supply circuit wire). Always
check the connections, the load and the supply
circuit whenever motor does not work well.
Electric Brake
Your saw is equipped with an automatic electric brake
which is designed to stop the blade from spinning in
about five (5) seconds after you release the trigger
switch. It is useful when making cer tain cuts in wood
where a coasting blade would result in a wide, imprecise cut.
When electrical power is lost
due to blown fuse or other causes, the motor will
gradually slow down and the braking action is initiated ONLY by the release of the trigger switch.
The electric blade brake of your miter saw has been
designed for highest degree of reliability, but unexpected circumstances such as contamination on the
commutator and brushes or failure of motor’s components can cause the brake not to activate . If this condition occurs, turn the saw “ON”and “OFF”four to five
times without contacting the workpiece. If the tool
operates but the brake does not consistently stop the
blade in about five (5) seconds, DO NOT use saw
and have it serviced immediately.
The brake action of this saw
is not intended as a safety feature. Remember to let
the saw blade come to a complete stop bef ore raising
the blade from the workpiece. As always the guard
system is your best protection against unintentional
contact with a spinning saw blade. NEVER wedge
open or defeat the closing action of the lower guard.
To avoid injury from acciden-
WARNING
WARNING
WARNING
7.
Black
From Field
Grey From
Brake Lead
10-45
Black From
Power Cord
Wiring Diagram
This wiring diagram can be used only with switch (Part No. 2610911881) supplied with
your miter saw. Other switches may look the same, but internal switch components can be different, thus creating electrical shock hazard if wired according to this diagram.
WARNING
tal starting, remove plug from power source outlet
before making any adjustments.
1. Switch “Lock-OFF” Button
This button must be pressed to activate the power
switch.
2. Power Switch
The power switch used with the “Lock-OFF” button
energizes the unit.
3. Switch Handle
This handle contains the switch. The blade is lowered into the workpiece by pushing/pulling down on
the handle.
4. Arbor Lock
Allows the user to keep the blade from rotating while
tightening or loosening arbor screw during blade
replacement or removal (Figure 34, page 28).
5. Lower Blade Guard/Lower Guard Lip
The lower blade guard helps protect your hands from
the spinning blade. It retracts as the blade is lowered. Lip can be used to raise the lower guard when
guard becomes jammed on a workpiece.
6. Blade
Use only 10" blades with 5/8" arbor hole.
7. Fence
Supports the workpiece. The fence has a cast in
scale to make repetitive cuts easy. The fence also
has holes which are used to secure an auxiliary
fence if desired.
BOSCH
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7
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8.
Getting To Know Your Miter Saw
Getting To Know Your Miter Saw
8. Kerf Inserts
Kerf inserts can be adjusted to different blade widths
to minimize workpiece tear-out.
9. Miter Detent Override
Allows detent action to be locked out allowing for
micro adjustments to any miter angle.
10. Miter Lock Knob
The miter lock knob locks the miter saw table at any
desired miter angle.
11. Miter Detent Trigger
The trigger releases the table from the detent.
12. Miter Scale/Miter Angle Indicator
This scale is cast in on the base of the saw. Indicator
is fastened to the table.
13. Miter Detents
There are ten (10) miter detents for fast and accurate
miter cuts of common miter angles.
14. Table
Sits in base, provides workpiece support, rotates for
desired miter cuts and rotates the head assembly.The
front extended part of the table is called the miter arm.
15. Base
Provides working surface to support workpiece.
16 Tool Mounting Pads
The four corners of the saw provide areas to clamp,
bolt or nail the saw to a flat work surface.
17. Accessory Extension and Stock Stop
Machined holes that accept the extension wing/stop
accessory.
18. Sliding Base/Fence
This provides extra support and clamping area for
compound miter cuts.
19. Chip Deflector
This protects against large chips from entering the
upper guard.
20. Dust Chute Elbow
The dust chute elbow rotates 360° and can accommodate the dust bag or a 1-1/4" vacuum hose hookup.
21. 0° Bevel Stop
Adjustable stop for a quick and accurate 0° bevel
index.
22. 45° Bevel Stop
Adjustable stop for a quick and accurate 45° bevel
index.
23. Slide Rail Lock Knob
The slide rail lock knob locks the slide rails when you
are not making slide cuts and when you are transporting the saw.
24. Slide Rails
Guide the head assembly when making slide cuts.
25. Quick Action Clamp
Provides fast clamping of workpiece.
26. Lower Guard Actuation Link
Allows for smooth movement of the lower guard.
27. Upper Blade Guard
Covers upper portion of the blade.
28. Blade Wrench
Used for tightening/loosening blade and adjusting
bevel stops . Blade wrench is stored in the switch handle.
29. Power Cord
Supplies power to motor .Has molded cord retainer for
storage.
30. Quick Action Clamp Positions
There are four (4) positions behind the fence for the
quick action clamp.
31. Hex Wrench
Used to adjust sliding base/fence, fence and blade
bolt. Hex wrench is stored in the base.
32 Bevel Detent Pin (Crown Molding Setting)
Allows you to easily move the head assembly to the
bevel angle of 33.9°.
33. Bevel Lock Handle
The bevel lock handle locks the head assembly at a
desired bevel angle. Handle ratchets for use in tight
spaces.
34. Bevel Scale
This scale is cast in on the saw. Allows you to read
the bevel angles easily (Figure 7, page 13).
35. Head Assembly Lock Pin
The compound miter saw is equipped with a lock pin
used to lock the head assembly in the lower position.
36. Depth Stop
Allows you to adjust the depth of the blade for cutting
grooves in the workpiece (Figure 14, page 16).
37. Brush Caps
These caps keep the motor brushes in position and
provide easy access for inspecting and replacing
brushes.
33
34
10-21b
32
31
30
16
16
28
29
37
36
35
30
9.
10.
Disconnect plug from power source before performing any assembly, adjustment or
repair to avoid possible injury.
Unpacking And Checking Contents
WARNING
Assembly
Tools Needed For Assembly And Alignment
10-37
Should be no Gap or Overlap
when Square is Flipped Over in
Dotted Position
Draw Light
Line on Board
Along this Edge
Hex “L” Wrench
(supplied) 6mm
Straight Edge of
Board 3/4" Thick
This Edge Must be
Perfectly Straight
Blade Wrench
(supplied)
Combination Square Must be True
Phillips Screwdriver
Combination Square
Before moving the saw:
Lock the miter lock knob in 45° position. Lock bevel
lock handle. Pull the head assembly completely
toward you and tighten the slide rail lock knob.
Lock head assembly in the down position.
Never carry the tool by the slide rails, this may
cause blade misalignment.
Never carry the tool by the cord or head assembly
power switch handle. Damage to insulation could
cause an electric shock.Damage to wire connections
could cause a fire.
Model 3915 Slide Compound Miter Saw is shipped
complete in one box.
1. Separate all parts from packing materials and
check each one with the “Table of Loose Parts” to
make sure all items are accounted for before discarding any packing material.
2. Table of Loose Parts:
Quick Action Clamp - Used to clamp work-
pieces.
Dust Elbow/Dust Bag - Used to collect saw dust.
Hex Wrench - Should be stored on the left rear
base.
Blade Wrench - Should be stored in the handle.
If any parts are missing, do
not plug in power cord or turn the switch on until the
missing parts are obtained and are installed correctly.
WARNING
CAUTION
Assembly
11.
Disconnect plug from power
source before performing any assembly, adjustment
or repair to avoid possible injury.
1. The slide compound miter saw is equipped with
a lock pin used to lock the miter saw in the lower
position. To release, push the handle down
slightly and pull the lock pin to its full out position
and rotate 90°.
NOTE:If the lock pin is stuck and will not pull out
when the handle is pushed down slightly, you
may have to adjust the depth stop screw (see
Depth Stop Adjustment, page 16) slightly so the
handle can be pushed down and the lock pin can
be pulled out.
2. Loosen the rear cover plate screw using a
Phillips screwdriver (Figure 1).
3. Rotate the lower guard by hand. Remove the
front cover plate screw using a Phillips screwdriver (Figure 1).
4. Rotate the cover plate counterclockwise so the
blade bolt is exposed (Figure 1).
5. Press and hold the arbor lock. Use the blade
wrench to remove the blade bolt by turning
wrench clockwise. NOTE: The blade bolt has
a left hand thread.
Figure 1. Blade Removal
6. Remove the blade bolt, arbor washer, outer
washer and the blade. Inner washer does not
need to be removed (Figure 2).
Figure 2. Blade Hardware
7. To install the 10" blade, fit blade between the
chip deflectors and onto arbor shaft (Figure 3).
NOTE: Make sure the rotation arrow on the
blade matches the clockwise rotation arrow on
the lower guard.
Figure 3. Blade Installation
To avoid injury, do not use a
blade larger or smaller than 10" diameter and 5/8"
arbor.
8. Replace the outer washer in the proper orienta-
tion, insert the arbor washer, and tighten blade
bolt finger tight. Press the arbor lock and tighten blade bolt securely using blade wrench, but
do not overtighten.
9. Rotate cover plate clockwise to original position.
Install the cover plate screw and tighten.
WARNING
10-19a
Chip Deflector
Inner
Washer
BOSCH
Arbor
Shaft
Outer Washer
Inner Washer
Sawblade
10-33
Arbor Washer
Blade Bolt
(Left Hand Thread)
Chip Deflector
Cover
Plate
10-20a
Blade Bolt
Outer
Washer
BOSCH
Lower Guard
Rear Cover
Plate Screw
Front Cover
Plate Screw
WARNING
Installation And Removal Of The Blade
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