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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.
DRILLING IN METAL
®
An SDS Plus
to round shank adaptor chuck is required. Ensure that
tool is in drill-only mode. 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" to 1/2" (7.9 mm to 12.7 mm)] holes in steel can
be made easier if a pilot hole [5/32" to 3/16" (4 mm to 4.8 mm)] is
drilled first.
DRILLING IN WOOD
An SDS Plus
®
to round shank adaptor chuck is required. Ensure that
tool is in drill-only mode. Start drilling with slow speed and increase
to full power while applying firm pressure on the tool. Holes in wood
can be made with the same twist drills used for metal. These bits may
overheat unless pulled out frequently to clear chips from the flutes. For
larger holes, use spade bits, power auger bits, or hole saws. Work that
is apt to splinter should be backed up with a block of wood.
HAMMERDRILL OPERATION
1. When drilling, use just enough force on the hammer to keep it
from bouncing excessively or "rising" off the bit. Too much force
will cause slower drilling speeds, overheating, and a lower drilling
rate.
2. Drill straight, keeping the bit at a right angle to the work. Do not
exert side pressure on the bit when drilling as this will cause
clogging of the bit flutes and a slower drilling speed.
3. When drilling deep holes, if the hammer speed starts to drop off,
pull the bit partially out of the hole with the tool still running to help
clear debris from the hole.
4. For masonry, use carbide-tipped bits or masonry bits. A smooth
even flow of dust indicates the proper drilling rate.
Depth Rod (Fig. 6)
TO ADJUST THE DEPTH ROD
1. Push in and hold the depth rod release button (J) on the side
handle.
2. Move the depth rod (D) so the distance between the end of the
rod and the end of the bit equals the desired drilling depth.
3. Release the button to lock rod into position. When drilling with the
depth rod, stop when end of rod reaches surface of material.
FIG. 6
D
9
J
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