Bosch GSB18V-1330C Instrucciones De Funcionamiento Y Seguridad página 20

Driving 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.
Drilling
You will extend the life of your bits and do neater
work if you always put the bit in contact with the work
before pulling the trigger. During the oper a tion, hold
the tool firmly and exert light, steady pressure. Too
much pressure at low speed will stall the tool. Too
little pressure will keep the bit from cutting and cause
excess friction by sliding over the surface. This can be
damaging to both tool and bit.
Drilling with Variable Speed
The variable speed trigger allows you to slowly increase
RPM. By using a slow starting speed, you are able to
keep the bit from "wander ing". You can increase the
speed as the bit "bites" into the work by squeezing the
trigger.
Driving with variable speed
Variable speed drills will double as a power screwdriver
by using a screwdriver bit. Prior to driving screws,
pilot and clearance holes should be drilled. Place the
threaded end of the screw in the pilot or clearance hole
and start driving the screw slowly, increasing the speed
as the screw runs down. Set the screw snugly by slowing
to a stop.
Fastening with Screws
The procedure shown in Fig. 16 will enable you to fasten
materials together using your drill without stripping,
splitting or separating the material.
First, clamp the pieces together and drill the hole 2/3
the diameter of the screw. If the material is soft, drill
only 2/3 the proper length. If it is hard, drill the entire
length.
Second, unclamp the pieces and drill the hole in the top
piece of wood again to the same diameter as the shank
of the screw.
Third, if flat head screw is used, countersink the hole to
make the screw flush with the surface. Realign the holes
on the two pieces and apply even pressure when driving
the screw. The screw shank clearance hole in the first
Operating Tips
FASTENING
WITH SCREWS
1. Drill 2/3 diameter and 2/3
of screw length for soft
materials, full length for
hard materials.
Screw
piece allows the screw head to pull the pieces tightly
together.
The adjustable screw drill accessory will do all of these
operations quickly and easily. Screw drills are available
for screw sizes No. 6, 8, 10 and 12.
Electronic Angle Detect
Orientation of the tool while calibrating the surface will
determine the reference for the angle. On a vertical
wall, if the tool is calibrated with the chuck pointing
upward, a target angle will be established in an upward
orientation (e.g. +45°). If the tool is calibrated with
the chuck pointing downward, a target angle will be
established in a downward orientation (e.g. -45°).
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.
20
2. Drill same
diameter as
screw shank.
3. Countersink same
diameter as screw
head.
Apply a slight
even pressure
when driving
screws.
Adjustable
Screw
Drill