Operating Tips - Bosch PS31 Instrucciones De Funcionamiento Y Seguridad

2610056733 02-21 PS31_PS31 2/15/21 12:41 PM 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. 5) 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. 5
Adjustable
Screw
Drill