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GRINDER OPERATION

 

ON

Switch

1. Hold the grinder firmly by its housing

OFF

 

 

and side handle (Fig. 1).

 

 

The grinder produces a counterforce which

 

 

must be controlled by firmly holding onto

 

 

the grinder.

 

 

2. Turn the grinder “on”. (Fig. 3)

 

 

While holding the grinder firmly, use one

 

 

finger to slide the switch to the “on” position.

 

 

3. Use light grinding pressure.

Fig. 3

 

There is no need to press hard when grinding.

 

 

 

Usually the grinder’s own weight is sufficient

 

 

to allow the required light contact with the

 

 

surface to be ground.

 

 

WARNING: Do not press the grinder forcibly against the surface to be ground. Heavy pressure can result in wheel breakage and serious injury. It can also damage the surface being ground or damage the grinder’s motor.

4.Use proper grinding angle.

Grind only with the wheel’s edge by lifting the grinder 15° to 30°, as shown in Fig. 4.

CAUTION: Do not use the entire surface of the depressed center wheel. Use only the edge of the depressed center wheel.

5. Move the grinder in the proper direction.

 

 

When using a new depressed center wheel

 

 

in direction A (Fig. 4), the wheel edge may

 

 

cut into the workpiece. In this case, grind in

 

 

direction B (Fig. 4).

 

15°~30°

Once the wheel edge is worn, the workpiece

 

 

 

can be ground in both directions.

 

 

NOTE: The wheel provided (resinoid wheel) is

A

B

rated as Class A grain and # 36 grain

 

Fig. 4

size. It is most suitable for heavy grinding

 

 

 

of steel and other types of materials.

 

 

6.Adjust operation to desired finish.

For a fine finish, decrease pressure by lifting slightly. Grind slowly and at the appropriate speed.

CAUTION: The revolving depressed center wheel will create air turbulence.

Do no lay the grinder down in areas of dust or dirt until it has come to a complete stop.

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Hitachi G 12SA2 instruction manual Grinder Operation