Makita 3803A User Manual
Groove Cutter
MODEL 3803A
INSTRUCTION MANUAL
WARNING:
For your personal safety, READ and UNDERSTAND before using.
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.
004818
SPECIFICATIONS
Model 3803A
Max. cutter blade size 46 mm x 120 mm (1-13/16” x 4-3/4”)
Max. cutting depth 31 mm (1-7/32”)
No load speed (RPM) 9,000/min.
Overall length 411 mm (16-3/16”)
Net weight 6.8 kg (15 lbs)
• Manufacturer reserves the right to change specifications without notice.
• Specifications may differ from country to country.
GENERAL SAFETY RULES USA001-3
(For All Tools)
WARNING:
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
Work A re a
1. Keep your work area clean and well lit.
Cluttered benches and dark areas invite accidents.
2. Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases, or dust. Powe r
tools create sparks which may ignite the dust
or fumes.
3. Keep bystanders, children, and visitors
away while operating a power tool. Dis-
tractions can cause you to lose control.
2
Electrical Safety
4. Grounded tools must be plugged into an
outlet properly installed and grounded in
accordance with all codes and ordinances. Never remove the grounding
prong or modify the plug in any way. Do
not use any adaptor plugs. Check with a
qualified electrician if you are in doubt as
to whether the outlet is properly
grounded. If the tools should electrically mal-
function or break down, grounding provides a
low resistance path to carry electricity away
from the user.
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. Do not expose power tools to rain or wet
conditions. Water entering a power tool will
increase the risk of electric shock.
7. 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.
8. 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
9. 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.
10. 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.
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 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.
13. Do not overreach. Keep proper footing
and balance at all times. Proper footing 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. Ordinary
eye or sun glasses are NOT eye protection.
Tool Use and Care
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 loss of control.
16. 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.
17. 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.
18. 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.
19. Store idle tools out of reach of children
and other untrained persons. Tools are
dangerous in the hands of untrained users.
20. 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.
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 serviced 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.
3
SERVICE
23. Tool service must be performed only by
qualified repair personnel. Service or main-
tenance performed by unqualified personnel
could result in a risk of injury.
24. 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.
USE PROPER EXTENSION CORD: Use only three-wire extension cords that have
three-prong grounding-type plugs and three-pole receptacles that accept the tool's
plug. Make sure your extension cord is in good condition. Replace or repair damaged
or worn cord immediately. When using an extension cord, be sure to use one heavy
enough to carry the current your product will draw. An undersized cord will cause a
drop in line voltage resulting in loss of power and overheating. Table 1 shows the
correct size to use depending on cord length and nameplate ampere rating. If in
doubt, use the next heavier gage. The smaller the gage number, the heavier the cord.
Table 1: Minimum gage for cord
Ampere Rating
More Than Not More Than AWG
0 6 18 16 16 14
6 10 18161412
10 12 16 16 14 12
12 16 14 12 Not Recommended
Volts Total length of cord in feet
120 V 25 ft. 50 ft. 100 ft. 150 ft.
GROUNDING INSTRUCTIONS:
This tool should be grounded while in use to protect the operator from electric shock.
The tool is equipped with a three-conductor cord and three-prong grounding type
plug to fit the proper grounding type receptacle. The green (or green and yellow) conductor in the cord is the grounding wire. Never connect the green (or green and yellow) wire to a live terminal. Your unit is for use on 120 volts and has a plug that looks
like Fig. “A”.
Grounding
Blade
Cover of Grounded
Outlet Box
Fig. A
4
SPECIFIC SAFETY RULES USB084-1
DO NOT let comfort or familiarity with product (gained from
repeated use) replace strict adherence to groove cutter safety
rules. If you use this tool unsafely or incorrectly, you can suffer
serious personal injury.
1. Inspect for and remove nails or foreign
matter from the workpiece before operation.
2. Check the cutter blade carefully for cracks
or damage before operation. Replace
cracked or damaged cutter blade immediately.
3. Secure the workpiece firmly.
4. Do not wear gloves during operation.
5. Hold the tool firmly with both hands.
6. Keep hands away from the underside of
the belt cover and the cutting blade. Also
keep the cord away from them.
7. Never force the tool or cut too fast for
existing conditions.
8. Release the switch immediately if the cutter blade binds or the tool stalls.
9. Never remove the tool from a cut while the
cutter blade is rotating.
10. Never leave the tool running unattended.
11. Never attempt to cut with the tool held
upside down in a vise. This is extremely
dangerous and can lead to serious accidents.
12. Switch off and unplug the tool and wait for
the cutter blade to come to a complete
stop before removing wood chips if wood
chips are jammed in the chip chute.
Always use a wooden stick, etc. to
remove them.
13. Some material contains chemicals which
may be toxic. Take caution to prevent
dust inhalation and skin contact. Follow
material supplier safety data.
SAVE THESE INSTRUCTIONS
WARNING:
MISUSE or failure to follow the safety rules stated in this
instruction manual may cause serious personal injury.
5
FUNCTIONAL
DESCRIPTION
1
1. Depth indicator
2. Indication plate
3. Knob
2
3
1. Cutting line
2. Arrow for conventional cutter
blades and four teeth cutter blade
3. Arrow for dado cutter baldes
4. Width of cut
5. Direction of cut
2
3
1
4
5
CAUTION:
• Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
004819
Adjusting the depth of cut
Loosen the knob on the belt cover. Move the handle up or
down until the indication plate indicates the graduation for
the depth of cut desired. The tighten the knob securely. Each
increment on the depth indicator indicates 3 mm (1/8”) cutting depth.
004820
Cutting position
This tool may be operated with conventional cutter blades,
four teeth cutter blades for grooving or dado cutter blades.
There are two arrows on the scale plate located on the front
edge of the tool’s base plate. The arrow on the cutter cover
side is for conventional cutter blades or four teeth cutter
blades. The arrow on the belt cover side is for dado cutter
blades. Align the appropriate arrow with the cutting line.
These arrows are to be used to guide along your desired cutting line. They accurately indicate the left edge of your cut as
you are cutting. The width of cut may vary according to the
width of cutter blade selected. (3 mm; 1/8” per graduation on
the scale plate)
004821
1
2
1. When using cutter blades 120 mm
(4-3/4”) in dia.
2. Depth indicator
3. Indication plate
3
6
Adjusting the indication plate
Adjust the indication plate as follows when replacing the cutter blade.
• Loosen the knob on the belt cover. Move the handle up
or down until the cutter blade tips are flush with the
underside of the tool base while revolving the cutter
blade by turning the drive belt by hand. Then tighten the
knob securely. Adjust the indication plate so that it points
to the “0” graduation.
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