OPERATION
TO ADJUST DRILLING OR HAMMER MODE
See Figure 16.
To adjust hammer drill to drilling or hammer operation, rotate mode selector in the direction of arrows as shown in Figure
16.For your convenience a hammer symbol and drill bit sym- bol have been molded into the selector.
WARNING:
Your hammer drill has not been designed for re- verse hammering. Reverse hammering may dam- age your drill.
We recommend that you use
We recommend that you select normal drilling mode when drilling with twist drills, hole saws, etc. in steel and soft mate- rials.
WOOD DRILLING
For maximum performance, use high speed steel bits for wood drilling.
Turn mode selector ring on hammer drill to normal drilling action.
Begin drilling at a very low speed to prevent the bit from slipping off the starting point. Increase the speed as the drill bit bites into the material.
When drilling through holes, place a block of wood behind the workpiece to prevent ragged or splintered edges on the back side of the hole.
Do not lock the trigger on for jobs where your hammer drill may need to be stopped suddenly.
METAL DRILLING
For maximum performance, use high speed steel bits for metal or steel drilling.
Turn mode selector on hammer drill to normal drilling action.
Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
Maintain a speed and pressure which allows cutting without overheating the bit. Applying too much pres- sure will:
-Overheat the drill;
-Wear the bearings;
-Bend or burn bits; and
-Produce
HAMMER OPERATION | ADJUSTING |
DRILLING OPERATION | RING |
| |
22 |
|
20 |
|
18 |
|
16 |
|
Fig. 16
When drilling large holes in metal, we recommend that you drill with a small bit at first, then finish with a larger bit. Also, lubricate the bit with oil to improve drilling action and increase bit life.
MASONRY DRILLING
For maximum performance use
Turn mode selector on hammer drill to hammer mode.
Apply light pressure and medium speed for best results in brick.
Apply additional pressure and high speed for hard materials such as concrete.
When drilling holes in tile, practice on a scrap piece to determine the best speed and pressure.
17