Bosch PS31 Instrucciones De Funcionamiento Y Seguridad página 13

2610056733 02-21 PS31_PS31 2/15/21 12:41 PM Page 13
DRILL BITS
Always inspect drill bits for excessive wear.
Use only bits that are sharp and in good
condition.
TWIST BITS: Available with straight and
reduced shanks for wood and light duty metal
drilling. High speed bits cut faster and last
longer on hard ma terials.
CARBIDE TIPPED BITS: Used for drilling stone,
con crete, plaster, cement and other unusually
hard nonmetals. Use continuous heavy feed
pres sure when employing carbide tip bits.
DRILLING WOOD
Be certain workpiece is clamped or anchored
firm ly. Always apply pressure in a straight line
with the drill bit. Maintain enough pressure to
keep the drill "biting".
When drilling holes in wood, twist bits can be
used. Twist bits may overheat unless pulled
out frequently to clear chips from flutes.
Use a "back-up" block of wood for work that
is likely to splinter, such as thin materials.
You will drill a cleaner hole if you ease up on
the pressure just before the bit breaks
through the wood. Then complete the hole
from the back side.
DRILLING METAL
There are two rules for drilling hard materials.
First, the harder the material, the greater the
pres sure you need to apply to the tool.
Second, the harder the material, the slower
the speed. Here are a couple of tips for drilling
in metal. Lubri cate the tip of the bit
occasionally with cutting oil except when
drilling soft metals such as alu minum, cop per
or cast iron. If the hole to be drilled is fairly
large, drill a smaller hole first, then enlarge to
the required size, it's often faster in the long
run. Main tain enough pressure to assure that
the bit does not just spin in the hole. This will
dull the bit and greatly shorten its life.
RUNNING NUTS AND BOLTS
Variable speed control must be used with
caution for driving nuts and bolts with socket
set attach ments. The technique is to start
slowly, increasing speed as the nut or bolt
runs down. Set the nut or bolt snugly by
slowing the drill to a stop. If this procedure is
not followed, the tool will have a tendency to
torque or twist in your hands when the nut or
bolt seats.
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