Bosch 24618 Manual de instrucciones - Página 14
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Operating Tips
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.
DRIVING WITH VARIABLE SPEED
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.
Always hold the machine straight on the bolt
to be tightened.
The best method to determine
the right
impacting/tightening duration is by means of
a trial.
For
small
screws,
the
right
impacting/tightening duration can be reached
in less then 0.5 Sec. Therefore, work with
low RPM and
switch
the machine
off
immediately when the screw is tight and the
impacting sound can be heard.
For screwing larger, longer wood screws into
hard material, pre-drilling is the best method.
TIGHTENING TORQUE
(Models 24614 & 24618 only)
The tightening
torque
depends
on the
duration of the impacting/tightening
action.
The largest tightening
torque is achieved
after
approx.
6 to 10 Sec.
impacting/
tightening action.
The torque
build-up
depends
on the
following factors:
• Hardness of the bolts/nuts.
• Type of washer
(disk washer,
spring
washer, seal).
• Hardness of the material to be joined.
• Lubricating
effect at the surfaces
of the
junction.
This leads to the following application cases:
Hard case: The joining of metal to metal with
a disk washer.
The maximum
torque
is
reached after a relative short impacting/
tightening action.
Medium case: The joining of metal to metal
where spring
ring washer,
disk spring
washer, stud bolts or bolts/nuts with conical
seats are used.
Soft case: The joining of e.g. metal to wood
or insulation material.
For middle
or soft joining
cases,
the
maximum tightening
torque is less as for
hard cases. Therefore, a longer impacting/
tightening action is necessary to arrive at the
maximum tightening torque.
FASTENING WITH SCREWS
This procedure shown in (Fig. 9) will enable
you to fasten materials together with your tool
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 fiat 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.
I1=[_1
-14-
FASTENING
WITH SCREWS
(
\ N
_
3
1, Drill 2/3diameter a nd t
"
2/3 of screw length for _
_
soft materials, full
/
]
length for hard
" I
m_terials,
t
I
2. Drill same
diameter
as
screw shank.
Countersink
same diameter
as screw head.
Apply a slight
/
_:
!
even pressure
when driving
screws.
Screw