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2610056809 GSR GSB18V-975C 03-21.qxp_GSB18V-975C 3/5/21 4:34 PM Page 19
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. 14 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.
Operating Tips
FASTENING
WITH SCREWS
1. Drill 2/3 diameter and
2/3 of screw length for
soft materials, full
length for hard
materials.
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 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.
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".
SAVE THESE INSTRUCTIONS
2. Drill same
diameter as
screw shank.
3. Countersink
Screw
Apply a slight
even pressure
when driving
screws.
FIG. 14
same diameter
as screw head.
Adjustable
Screw
Drill
Top
Bottom
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