Relation Between Saw Blade And Spreader; Overload Protective Device; Precautions On Using The Electric Brake - Hitachi C 10RA2 Technical And Service Manual

8-4. Relation between Saw Blade and Spreader

t =2.3 mm
2
The spreader bites into the workpiece kerf like a wedge to prevent the saw blade from being pressed by the
workpiece. Therefore, the spreader thickness needs to be larger than the saw thickness (t
However, if the spreader thickness is larger than the set width (W), a large resistance is applied to the feeding of
the workpiece, making operation impossible.
If a locally available saw blade is used, the above relation cannot be obtained, causing a defect in operation.
Therefore, it is important to advise the user to use only genuine Hitachi saw blades.

8-5. Overload Protective Device

This tool is provided with an overload protective device (thermal relay). If the workpiece feed speed is too fast or
the saw blade is dull, the overload protective device engages to stop power to the motor and protect it. In this
case, allow the motor to cool from 3 to 5 minutes and then press the reset switch to resume operation.

8-6. Precautions on Using the Electric Brake

This machine is equipped with a electric brake to stop the blade's rotation when the switch is turned OFF. When
the switch is turned OFF, the rotation usually stops in 3 to 5 seconds. Should it take more than 15 seconds before
stopping, the machine should not be used. Instruct the customer to contact a Hitachi electric tool dealer for
inspection or repair if this occurs.
(1) Be sure to use carbon brushes designated for this machine (Code No. 999044). The use of any other carbon
brush will hinder performance of the electric brake.
(2) Should the electric brake fail to function, check the carbon brushes. If they wear below 5 mm (3/16") in length,
replace them. If the electric brake still does not function, it may be necessary to replace the armature ass'y,
etc.
W
Fig. 19
The saw thickeness (t
t
1
spreader thickness (t
prevent dislodging : W>t
The spreader thickness of C 10RA2 is 2.3 mm. (Fig. 19)
--- 16 ---
), set width (tip width, W) and
1
) are set in the following relation to
2
>t .
2 1
).
1