Practical Grinder Application

5.Ensure that the depressed center wheel to be utilized is the correct type and free of cracks or surface defects. Also ensure that the depressed center wheel is properly mounted and the wheel nut is securely tightened, refer to the section on “Depressed Center Wheel Assembly”.

6.Conducting a trial run

Ensure that the abrasive products is correctly mounted and tightened before use and run the tool at no-load for 30 seconds in a safe position, stop immediately if there is considerable vibration or if other defects are detected.

If this condition occurs, check the machine to determine the cause.

7.Confirm the spindle lock mechanism

Confirm that the spindle lock is disengaged by pushing push button two or three times before switching the power tool on (See Fig. 3).

8.Fixing the side handle

Screw the side handle into the gear cover.

1.Pressure

To prolong the life of the machine and ensure a first class finish, it is important that the machine should not be overloaded by applying too much pressure. In most applications, the weight of the machine alone is sufficient for effective grinding. Too much pressure will result in reduced rotational speed, inferior surface finish, and overloading which could reduce the life of the machine.

2.Grinding angle

Do not apply the entire surface of the depressed center wheel to the material to be ground. As shown in Fig. 2, the machine should be held at an angle of 15° – 30° so that the external edge of the depressed center wheel contacts the material at an optimum angle.

15 – 30°

A B

Fig. 2

3.To prevent a new depressed center wheel from digging into the workpiece, initial grinding should be performed by drawing the grinder across the workpiece toward the operator (Fig. 2 direction B). Once the leading edge of the depressed center wheel is properly abraded, grinding may be conducted in either direction.

4.Switch operation

Switch ON: Push the locking button forward and then press the switch lever.

*For continuous use, press the switch lever. The switch lever is locked by

pushing the locking button forward once again.

(*Subject to change depending on area.)

Switch OFF: Press and release the switch lever.

5.Precautions immediately after finishing operation After switching off the machine, do not put it down until the depressed center wheel has come to a complete stop. Apart from avoiding serious accidents,

this precaution will reduce the amount of dust and swarf sucked into the machine.

CAUTION:

◯Check that the work piece is properly supported.

◯Ensure that ventilation openings are kept clear when working in dusty conditions.

If it should become necessary to clear dust, first disconnect the tool from the mains supply (use non- metallic objects) and avoid damaging internal parts.

◯Ensure that sparks resulting from use do not create a hazard e.g. do not hit persons, or ignite flammable substances.

◯Always use protective safety glasses and hearing protectors, use other personal protective equipment such as gloves, apron and helmet when necessary.

◯Always use eye and ear protection.

Other personal protective equipment such as dust mask, gloves, helmet and apron should be worn when necessary.

If in doubt, wear the protective equipment.

◯When the machine is not use, the power source should be disconnected.

ASSEMBLING AND DISASSEMBLING THE DEPRESSED CENTER WHEEL AND OTHER TOOLS

CAUTION:

Be sure to switch OFF and disconnect the attachment plug from the receptacle to avoid a serious accident.

1. Assembling (Fig. 3)

(1)Turn the machine upside down so that the spindle is facing upward.

(2)Mount the wheel washer onto the spindle.

(3)Fit the protruding part of the depressed center wheel or cutting wheel or diamond wheel onto the wheel washer.

(4)Screw the wheel nut onto the spindle.

(For diamond wheel assembling, use the wheel nut with the convex side against the diamond wheel.)

(5)Insert the push button to prevent rotation of the spindle, and tighten the wheel nut with the accessory

wrench, as shown in Fig. 3.

2.Disassembling

Follow the above procedures in reverse.

CAUTION:

◯Comfirm that the depressed center wheel is mounted firmly.

◯Confirm that the push button is disengaged by pushing push button two or three times before switching the power tool on.