7.IMPACT to ROTATION changeover: (Fig. 2)
The Impact Drill can be switched from IMPACT (impact plus rotation) to ROTATION (rotation only) by simply turning the change ring.
When boring concrete, stone, tile or similar hard materials, turn the change ring fully clockwise. The drill head impacts against the material while continuing to rotate.
When boring metal, wood or plastic, turn the change ring fully counterclockwise. The drill simply rotates as an ordinary electric drill.
Change ring Gear cover
Rotation
Rotation + impact 1 2
Fig. 2
CAUTION
Do not use the Impact Drill in the IMPACT function if the material can be bored by rotation only. Such action will not only reduce drill efficiency, but may also damage the drill tip.
When changing over, ensure that the change ring is turned as far as it will go.
8. Fixing the side handle.
Loosen the glip on the side handle, and attach the side handle to the gear cover in a position convenient for drilling. Match the projecting part of the handle to the groove on the gear cover, and firmly tighten the glip.
To remove the side handle, loosen the glip, and rotate the handle.
To attach a depth stopper on the side handle, insert the stopper into the hexagon hole groove on the side handle, adjust the position of the depth stopper in accordance with the desired depth of the hole, and firmly tighten the glip.
PRACTICAL HANDLING PROCEDURES
1.Pressure:
Drilling will NOT be accelerated by placing heavy pressure on the drill. Such action will only result in a damaged drill bit, decreased drilling efficiency and/or shortened service life of the drill.
2.Using a large diameter drill bit:
The larger the drill bit diameter, the larger the reactive force on your arm. Be careful not to lose control of the drill because of this reactive force. To maintain firm control, establish a good foothold, hold the drill tightly with both hands, and ensure that the drill is vertical to the material being drilled.
3.When drilling completely through the material: When the drill bit bores completely through the material, careless handling often results in a broken drill bit or damage to the drill body itself due to the sudden movement of the drill.
Always be alert and ready to release the pushing force when drilling through the material.
4.Switch operation:
(1)
By pulling the trigger switch and depressing the stopper, the switch is held in the ON position for continuous operation. To turn the drill OFF, pull the trigger switch again and release.
(2)
The rotational speed of the drill bit can be controlled by varying the amount that the trigger switch is pulled. Speed is low when the trigger switch is pulled slightly and increases as the switch is pulled more. Continuous operation may be attained by pulling the trigger switch and depressing the stopper. To turn the switch OFF, pull the trigger switch again to disengage the stopper, and release the trigger switch to its original position.
5.Precautions on boring
The drill may become overheated during operation; however, it is sufficiently operable. Do not cool the drill bit in water or oil.
6.Caution concerning immediately after use Immediately after use, while it is still revolving, if the Drill is placed on a location where considerable ground chips and dust have accumulated, dust may occasionally be absorbed into the Drill mechanism.
Always pay attention to this possibility.
MAINTENANCE AND INSPECTION
1.Inspection the drill bit
Continued use of a worn and/or damaged drill bit will result in reduced drilling efficiency and may seriously overload the drill motor. Inspect the drill bit often and replace it with a new bit as necessary.
2.Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be loose, retighten them immediately. Failure to do so could result in serious hazard.
3.Inspecting the carbon brushes (Fig. 3)
The Motor employs carbon brushes which are consumable parts. When they become worn to or near the “wear limit”, it could result in motor trouble. When an
At that time, replace both carbon brushes with new ones which have the same carbon brush Numbers shown in the figure. In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders.
Wear limit
b mm No. of carbon brush a mm
No. of | a | b |
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|
carbon |
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| ||
brush |
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|
43 | 17 | 6 |
| Usual carbon |
| brush | |||
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|
|
| |
73 | 17 | 7 |
| |
| carbon brush | |||
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|
| |
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| Fig. 3 | |
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