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NOTE: Use lower speeds for starting holes without a center punch,
drilling in metal or plastics, driving screws or drilling ceramics. Higher
speeds are better for drilling wood and composition boards and using
abrasive and polishing accessories.
VARIABLE SPEED
A variable speed trigger switch (A) permits speed control—the farther
the trigger is depressed, the higher the speed of the drill.
For continuous operation, press and hold the variable speed switch,
move the lock-on button (B) up, then release the switch.
To stop continuous operation, press the switch briefly and release
it. Always switch the tool off when work is finished and before
unplugging.
Proper Hand Position
(Fig. 9)
WARNING: To reduce the risk of
serious personal injury, ALWAYS use
proper hand position as shown in figure 9.
WARNING: To reduce the risk of
serious personal injury, ALWAYS hold
securely in anticipation of a sudden
reaction.
Proper hand position requires one hand on
the main handle (J), with the other hand on
the side handle (G).
Drilling
WARNING: To reduce the risk of personal injury, ALWAYS
ensure workpiece is anchored or clamped firmly. If drilling thin
material, use a wood "back-up" block to prevent damage to the
material.
1. Use sharp drill bits only. For WOOD, use twist drill bits, spade bits,
power auger bits, or hole saws. For METAL, use steel twist drill
bits or hole saws. For MASONRY, such as brick, cement, cinder
block, etc., use carbide-tipped bits rated for percussion drilling.
2. Always apply pressure in a straight line with the bit. Use enough
pressure to keep drill biting, but do not push hard enough to stall
the motor or deflect the bit.
3. Hold tool firmly with both hands to control the twisting action of
the drill.
4. IF DRILL STALLS, it is usually because it is being overloaded or
improperly used. RELEASE TRIGGER IMMEDIATELY, remove
drill bit from work, and determine cause of stalling. DO NOT
CLICK TRIGGER ON AND OFF IN AN ATTEMPT TO START
A STALLED DRILL — THIS CAN DAMAGE THE DRILL.
FIG. 9
J
5. To minimize stalling or breaking through the material, reduce
pressure on drill and ease the bit through the last fractional part
of the hole.
6. Keep the motor running when pulling the bit back out of a drilled
hole. This will help prevent jamming.
7. With variable speed drills there is no need to center punch
the point to be drilled. Use a slow speed to start the hole and
accelerate by squeezing the trigger harder when the hole is deep
enough to drill without the bit skipping out.
G
DRILLING IN METAL
Start drilling with slow speed and increase to full power while applying
firm pressure on the tool. A smooth even flow of metal chips indicates
the proper drilling rate. Use a cutting lubricant when drilling metals.
The exceptions are cast iron and brass which should be drilled dry.
NOTE: Large [5/16" (8 mm) to 1/2" (13 mm)] holes in steel can be
made easier if a pilot hole [5/32" (4 mm) to 3/16" (5 mm)] is drilled
first.
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