Makita 51778 User Manual
7-iw
Hypoid
185
mm
(7-1/4")
INSTRUCTION MANUAL
Saw
MODEL
MODEL
51
778
5277B
Blade
diameter
185 mm
17-1/4"1
Max. cutting capacities
50
O
62
mm 40 mm 44 mm
(2-3/8") (1-9/16") (1-23/32")
450
DOUBLE
INSU
LATlO
No load speed Overall Net
(RPMI
4,300 (17-1/4"1 (15.0
length weight
439
mm 6.8 kg
N
Ibs)
GENERAL SAFETY RULES
(For
All
Tools)
WARNING! Read and understand all instructions.
to follow
shock,
all
instructions listed below, may result in electric
fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
READ ALL INSTRUCTIONS.
1.
Keep your work area clean and well
accidents.
2.
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.
3.
Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to loose control.
4.
Double Insulated tools are equipped with a polarized plug (one blade is wider
than the other.) This plug will
in
plug does not fit fully
contact a qualified electrician to install a polarized outlet. Do not change
the plug
wire grounded power cord and grounded power supply system.
5.
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.
6.
Don't expose power tools to rain or wet conditions. Water entering a power
tool
7.
Do
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.
8.
When operating a power tool outside, use an outdoor extension cord marked
"W-A'
of
9.
Stay alert, watch what
a power tool. Do not use tool while tired or under the influence of drugs,
alcohol, or medication.
may result in serious personal injury.
IO.
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
any way. Double insulation H eliminates the need for the three
will
increase the risk
not abuse the cord. Never use the cord to carry the tools or
or "W." These cords are rated for outdoor use and reduce the risk
electric shock.
the outlet, reverse the plug. If
of
you
are doing and use common sense when operating
A
moment of inattention while operating power tools
in
lit.
Cluttered benches and dark areas invite
fit
in
a polarized outlet only one way.
electric shock.
moving parts.
it
still does not
pull
Failure
If
the
fit,
the plug
2
11.
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.
12.
Remove adjusting keys or switches 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.
13.
Do
not
overreach.
and balance enables better control of the tool in unexpected situations.
14. Use safety equipment. Always wear eye protection. Dust mask, non-skid
safety shoes, hard hat, or hearing protection must be used for appropriate
conditions.
15. 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
16. Do not force tool. Use
will
do the job better and safer at the rate for which
17. Do not use tool if switch does not turn
be controlled with the switch is dangerous and must be repaired.
18.
Disconnect the plug from the power source before making any adjustments,
changing accessories, or storing
reduce the risk
19. Store idle tools out of reach of children and other untrained persons.
are dangerous in the hands of untrained users.
20.
Maintain tools with care.
maintained tools, with sharp cutting edges are less likely to bind and are easier
to control.
21.
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 service before using. Many accidents are caused by poorly maintained
tools.
22.
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.
23.
Tool
service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result
injury.
24.
When servicing a tool, use only identical replacement parts.
tions in the Maintenance section
or failure to follow Maintenance Instructions may create a risk of electric shock or
injury.
Keep proper footing and balance at all times. Proper footing
loss
of control.
the
correct tool for your application. The correct tool
it
is designed.
it
on or off. Any tool that cannot
the
tool. Such preventive safety measures
of
starting the tool accidentally.
Keep cutting tools sharp and clean. Properly
in
a risk of
Follow
of
this manual. Use of unauthorized parts
instruc-
Tools
3
Specific Safety Rules
1.
DANGER! Keep hands away from cutting area and blade. Keep your second
hand on auxiliary handle,
saw, they cannot be cut by the blade.
Keep your body positioned to either side of the saw blade,
with the saw blade. KICKBACK could cause the saw to jump backwards. (See
"Causes and Operator Prevention of Kickback")
Do
not reach underneath the work while blade is rotating. The guard can
not protect you from the blade below the work. Don't attempt to remove cut
material when blade is moving.
CAUTION: Blades coast after turn off.
2.
Check lower guard for proper closing before each use.
if lower guard does not move freely and close instantly. Never clamp or tie
the lower guard into the open position. If saw is accidentally dropped, lower
guard may be bent. Raise the lower guard with the Retracting Handle and make
sure
it
moves freely and does not touch the blade or any other part, in all angles
and depths of cut.
3.
Check the operation and condition of the lower guard spring. If the guard
and the spring are not operating properly, they must be serviced before
Lower guard may operate sluggishly due to damaged parts gummy deposits,
or
a
buildup of debris.
4.
Lower guard should be retracted manually only for special cuts such as
"Pocket Cuts" and "Compound Cuts." Raise lower guard by Retracting
Handle.
For all other sawing, the lower guard should operate automatically.
5.
Always observe that the lower guard is covering the blade before placing
saw down on bench or floor. An unprotected, coasting blade
saw to walk backwards, cutting whatever is
it
6.
NEVER hold piece being cut
to support the work properly to minimize body exposure, blade binding, or
loss
7.
Hold tool by insulated gripping surfaces when performing an operation where
the cutting tool may contact hidden wiring or its own cord. Contact with
a
the operator.
8.
When
the accuracy of cut and reduces the chance for blade binding.
9.
Always use blades
holes. Blades that do not match the mounting hardware of the saw
eccentrically, causing
IO.
Never use damaged or incorrect blade washers or bolts. The blade washers
and bolt were specially designed for your saw, for optimum performance and
safety or operation.
As
soon as blade enters the material, lower guard must be released.
takes for the blade to stop after switch is released.
of control.
"live" wire will also make exposed metal parts of the tool "live" and shock
ripping always use a rip fence or straight edge guide. This improves
with
or
motor housing. If both hands are holding the
but
not
Do
not operate saw
will
cause the
in
its path. Be aware of the time
in
your hands or across your leg. It is important
correct size and shape (diamond vs. round) arbor
loss
of control.
in
will
line
use.
run
4
11.
Causes and Operator Prevention
of
Kickback:
Kickback is a sudden reaction to a pinched, bound or misaligned saw blade,
causing an uncontrolled saw to lift up and out of the workpiece toward the
operator.
When the blade is pinched or bound tightly by the kerf closing down, the blade
stalls and the motor reaction drives the unit rapidly back toward the operator.
If the blade becomes twisted or misaligned in the cut, the teeth at the back
edge of the blade can dig into the top surface of the wood causing the blade
to climb out of the kerf and jump back toward operator.
Kickback is the result of tool misuse and/or incorrect operating procedures
or conditions and can be avoided by taking proper precautions
as
given below.
Maintain a firm grip with both hands on the saw and position your body and
arm to allow you to resist
KICKBACK
forces. KICKBACK forces can be
controlled by the operator, if proper precautions are taken.
When blade is binding, or when interrupting a cut for any reason, release
the trigger and hold the saw motionless
in
the material
until
the blade comes
to a complete stop. Never attempt to remove the saw from the work or
the saw backward while the blade is in motion or
Investigate and take corrective actions to eliminate the cause
When restarting a saw in the workpiece, center the saw blade
and check that saw teeth are not engaged into the material.
KICKBACK
of
blade binding.
may occur.
in
If
saw blade
is binding, it may walk up or KICKBACK from the workpiece as the saw is
restarted.
Support large panels to miniinize the risk of blade pinching and
KICKBACK.
Large panels tend to sag under their own weight. Supports must be placed
under the panel on both sides, near the line of cut and near the edge
panel as shown in Fig.
To
minimize the risk
1.
of
blade pinching and kickback. When cutting operation
requires the resting of the saw on the work piece, the saw shall be rested
on the larger portion and the smaller
xe cut off.
pull
the kerf
of
the
To
avoid kickback, do support board
or
panel near
the
cut.
Fig.
1
I
Don't support board or panel away
or panel near the cut.
Fig.
:
5
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