Hitachi POWER TOOLS CR 13VA - Manual (Page 15)

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7-4. Cutting Operation for Long Blade Life
The service life of a saw blade may vary depending on the operating conditions such as the type of cutting action,
pressing force, etc. Observing the following instructions can lengthen the service life of a saw blade, for reference.
Do not apply undue force to the
workpiece. Appropriate pressing force is
about 4 kgf (8.8 lbs.).
The cutting edge contacts the pipe
in a seesaw motion.
< Explanation >
Heat generated in the cutting operation can significantly affect the service life of the saw blade. Continued cutting
operation with the saw blade heated to red hot can decrease the hardness of the saw blade because the cutting
edge is annealed. The saw blade is then worn out in a short time and nothing can be cut. The merits of moving
the saber saw up and down are described below.
The seesaw motion of the saw blade can minimize heating.
The effective cutting length of the blade is longer than that of an ordinary cutting operation. Thus, the service
life of the saw blade can be lengthened and the cutting speed becomes faster. Cutting wood in the same
manner can also make the cutting speed faster.
1
2
Application of undue force to the workpiece during the cutting operatation can heat up the saw blade and the
number of strokes can decrease, causing reduction of speed. Appropriate pressing force is about 4 kgf (8.8 lbs.).
Do not apply undue force to the workpiece 2
1 Move the saber saw handle up and down repeatedly during the cutting operation
The service life of a saw blade can be lenghtened by moving the saber saw handle up and down repeatedly
once or twice per second during the cutting operation as shown below.
Move the saber saw handle up
and down repeatedly once or
twice per second