Operating Tips - Bosch GSR18V-535FC Operating/Safety Instructions Manual

2610055572 GSR18V-535FC 01-2020.qxp_GSR18V-60FC 1/28/20 8:40 AM Page 23
▶ 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
To extend the life of bits and do neater work,
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. 21 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. 21
same diameter
as screw head
Adjustable
Screw
Drill
Top
Bottom
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