Bosch 1011VSR Operating/Safety Instructions Manual page 8

CHUCK KEY & STORAGE AREA
Keyed models are equipped with a chuck key
that can be conveniently located on the cord
protector where it is always handy and unlikely
to get lost or misplaced (Fig. 5).
FIG. 5
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 operation, 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 trigger controlled variable speed feature
will eliminate the need for center punches in
hard materials. The variable speed trigger
FASTENING WITH SCREWS
The procedure shown in (Fig. 6) will enable
you to fasten materials together with your
hammer drill in the drill mode without
stripping, splitting or separating the material.
First, clamp the pieces together and drill the
first 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
second hole the same diameter as the screw
shank in the first or top piece of wood.
Third, if flat head screw is used, countersink
the hole to make the screw flush with the
surface. Then, simply 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.
DEPTH GAUGE (Optional Accessory)
Your drilling depth can be pre-set and/or
repeated by using the depth gauge (optional
accessory), not included.
Setting depth: After the auxiliary handle is
installed, push down on the depth gauge
release lever, slide the depth gauge to
desired depth and release pressure on lever
to lock the depth gauge in place (Fig. 1).
Operating Tips
allows you to slowly increase RPM. By using a
slow starting speed, you are able to keep the
bit from "wandering". 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 in the
drill mode. The technique is to start slowly,
increasing the speed as the screw runs down.
Set the screw snugly by slowing to a stop. Prior
to driving screws, pilot and clearance holes
should be drilled.
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.
FASTENING
WITH SCREWS
1. Drill 2/3 diameter
and 2/3 of screw
length for soft
materials, full
length for hard
materials
Screw
Apply a slight
even pressure
when driving
screws
-8-
2. Drill same diameter
as screw shank
3. Countersink
same diameter
as screw head
Adjustable
Screw
Drill
FIG. 6