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2610052998 GSR18V-490 07-19.qxp_GSB18V-490 7/15/19 2:56 PM Page 13
▶ 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. 13 will enable
you to fasten materials together using your
drill without stripping, splitting or
separating the material.
Operating Tips
FASTENING
WITH SCREWS
1. Drill 2/3 diameter
and 2/3 of screw
length for soft
materials, full
length for hard
materials
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 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.
SAVE THESE INSTRUCTIONS
2. Drill same diameter
as screw shank
3. Countersink
Screw
Apply a slight
even pressure
when driving
screws
FIG. 13
same diameter
as screw head
Adjustable
Screw
Drill
Top
Bottom
13
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