Additional Safety Rules - Makita 4157KB Instruction Manual

17. Avoid unintentional starting
Don't carry plugged-in tool with finger on switch. Be
sure switch is off when plugging in.
18. Outdoor use extension cords
When tool is used outdoors, use only extension
cords intended for use outdoors and so marked.
19. Stay alert
Watch what you are doing. Use common sense. Do
not operate tool when you are tired.
20. Check damaged parts
Before further use of the tool, a guard or other part
that is damaged should be carefully checked to
determine that it will operate properly and perform
its intended function. Check for alignment of moving
parts, binding of moving parts, breakage of parts,
mounting, and any other conditions that may affect
its operation. A guard or other part that is damaged
should be properly repaired or replaced by an autho-
rized service center unless otherwise indicated else-
where in this instruction manual. Have defective
switches replaced by and authorized service center.
Do not use tool if switch does not turn it on and off.
21. Warning
The use of any other accessory or attachment other
than recommended in this operating instruction or
the catalog may present a risk of personal injury.
22. Have your tool repaired by an expert
This electric appliance is in accordance with the rel-
evant safety rules. Repairing of electric appliances
may be carried out only by experts otherwise it may
cause considerable danger for the user.

ADDITIONAL SAFETY RULES

1. Check the wheel carefully for cracks or damage
before operation. Replace cracked or damaged
wheel immediately.
2. Use only flanges specified for this tool.
3. Be careful not to damage the spindle, flanges
(especially the installing surface) or bolt. Dam-
age to these parts could result in wheel break-
age.
4. Hold the tool firmly.
5. Keep hands away from rotating parts.
6. Make sure the wheel is not contacting the work-
piece before the switch is turned on.
7. Wait until the wheel attains full speed before cut-
ting.
8. Stop operation immediately if you notice any-
thing abnormal.
9. Do not attempt to lock the trigger in the "ON"
position.
10. Never attempt to cut with the tool held upside
down in a vise. This can lead to serious acci-
dents, because it is extremely dangerous.
(Fig. 1)
11. Before setting the tool down after completing a
cut, be sure that the wheel has come to a com-
plete stop.
12. Do not stop the wheel by lateral pressure on the
disc.
13. The tool must be used only for dry cutting. Do
not use water.
SAVE THESE INSTRUCTIONS.
6
OPERATING INSTRUCTIONS
Removing or installing diamond wheel
(Fig. 2, 3 & 4)
CAUTION:
Always be sure that the tool is switched off and
unplugged before removing or installing the wheel.
Use a screwdriver to loosen the two screws which secure
the dust box. Then remove the dust box from the tool.
After removing the dust box, press the shaft lock so that
the diamond wheel cannot revolve and use the hex
wrench to loosen the hex socket head bolt counterclock-
wise. Then remove the hex socket head bolt, outer flange
and the diamond wheel. To install the diamond wheel, fol-
low the removal procedure in reverse.
BE SURE TO TIGHTEN THE HEX SOCKET HEAD
BOLT SECURELY.
CAUTION:
• Make sure that the arrow on the wheel should point in
the same direction as the arrow on the tool.
• Use only the Makita hex wrench to install or remove the
wheel.
Adjusting depth of cut (Fig. 5)
Loosen the lever on the depth guide and move the base
up or down. At the desired depth of cut, secure the base
by tightening the lever.
Bevel cutting (Fig. 6)
Loosen the knob on the bevel scale plate on the front of
the base. Set for the desired angle (0 – 45°) by tilting
accordingly, then tighten the knob securely.
Adjusting for accuracy of 90° cut (vertical cut)
(Fig. 7 & 8)
ENB051-1
This adjustment has been made at the factory. But if it is
off, adjust the adjusting screw with a hex wrench while
squaring the blade with the base using a triangular rule,
try square, etc.
Sighting (Fig. 9)
For straight cuts, align the right edge of the notch in the
front of the base with your cutting line on the workpiece.
For 45° bevel cuts, align the left edge of the notch in the
front of the base with it.
Switch action (Fig. 10)
CAUTION:
Before plugging in the tool, always check to see that the
switch trigger actuates properly and returns to the "OFF"
position when released.
To prevent the switch trigger from being accidentally
pulled, a lock-off button is provided. To start the tool,
depress the lock-off button and pull the switch trigger.
Release the switch trigger to stop.