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Sharpening diamond blades
Diamond blades can become dull when the wrong feeding
pressure is used or when cutting certain materials such as
heavily reinforced concrete. Working with a blunt diamond
blade causes overheating, which can result in the diamond
segments coming loose.
Sharpen the blade by cutting in a soft material such as
sandstone or brick.
Blade vibration
The blade can become out-of-round and vibrate if an
excessive feed pressure is used.
A lower feed pressure can stop the vibration. Otherwise
replace the blade. The blade must be of the recommended
type for the material to be cut.
How to avoid kickback
WARNING! Kickback can happen very
!
suddenly and violently; kicking the power
cutter and cutting blade back at the user. If
this happens when the cutting blade is
moving it can cause very serious, even fatal
injuries. It is vital you understand what
causes kickback and that you can avoid it by
taking care and using the right working
technique.
What is kickback?
The word kickback is used to describe the sudden reaction
that causes the power cutter and cutting blade to be thrown
from an object when the upper quadrant of the blade, known
as the kickback zone, touches an object.
General rules
•
Never start to cut with the upper quadrant of the blade as
shown in the figure, also known as the kickback zone.
•
Always hold the machine in a firm grip with both hands.
Hold it so that the thumbs and fingers grip round the
handles.
•
Keep a good balance and a firm foothold.
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SAFETY INSTRUCTIONS
•
Always cut at maximum speed.
•
Stand at a comfortable distance from the work piece.
•
Take care when inserting the blade in an existing cut.
•
Never cut above shoulder height.
•
Be alert to movement of the work piece or anything else
that can occur, which could cause the cut to close and
pinch the blade.
Pull in
Pull in occurs when the disc's lower section suddenly stops or
when the cut closes. (To avoid, see the heading "Basic rules"
and "Jamming/rotation", here below.)
Pinching/rotation
If the cut is pressed together this can lead to jamming. The
machine can be pulled down suddenly with a very powerful
jerk.
How to avoid pinching
Support the work piece in such a way that the cut remains
open during the cutting operation and when the cut is
finished.
Cutting blades
WARNING! A cutting blade may burst and
!
cause injury to the operator.
Never use a cutting blade at a lower speed
rating than that of the power cutter.
Never use a cutting blade for any other
materials than that it was intended for.
WARNING! Cutting plastics with a diamond
!
blade can cause kickback when the material
melts due to the heat produced when cutting
and sticks to the blade.
The machine must not be used with a rescue blade. The risk
of kick-back is greater with this type of cutting blade, as the
machine does not have a slipping clutch.
General
Cutting blades are available in two basic designs; abrasive
discs and diamond blades.
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