Bosch PS11-102 Operating/Safety Instructions Manual page 12

2610056734 02-21 PS11_BM 2610022006 04-12.qxp 2/15/21 10:39 AM Page 12
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 in the drill mode. The technique is to
start slowly, increasing the speed as the
screw runs down. Set the screw snug ly
by slowing to a stop. Prior to driving
screws, pilot and clearance holes should
be drilled.
FASTENING WITH SCREWS
This procedure shown in (Fig. 6) will
enable you to fasten ma terials together
with your Cordless Drill/Screwdriver
without stripping, splitting or separating
the material.
First, clamp the pieces together and drill
the first hole 2/3 the diam eter 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
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.
The adjustable screw drill accessory will
do all of these oper ations 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
-12-
2. Drill same
diameter as
screw shank.
3. Countersink
same diameter
as screw head.
Apply a slight
even pressure
when driving
screws.
FIG. 6
Adjustable
Screw
Drill