AFTER SALES SUPPORT
e-mail: [email protected]
1800 909 909 (toll free)
MODEL No.: IW36 • 61551 • 07/2018
AFTER SALES SUPPORT
e-mail: [email protected]
1800 909 909 (toll free)
MODEL No.: IW36 • 61551 • 07/2018
22
23
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, or allowing the impacts
to set the screw to the desired torque over a period of impact time. 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
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. Over tightening or the use of poor
quality fasteners can result in the fastener shearing.
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 relatively 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 will enable you to fasten materials together with your tool
without stripping, splitting or separating the material.
1. 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.
2. Unclamp the pieces and drill the second hole the same diameter as the
screw shank in the first or top piece of wood.
3. 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.
Running nuts and bolts
NOTE: When tightening a nut or a bolt always start the fastener by hand
by 2 or 3 threads BEFORE using the impact wrench.
NOTE: The longer the impact wrench is operated in the hammer function,
the tighter the fastener will become. 1 –2 seconds is normally sufficient
with small nuts, and bolts even less time.
Variable speed control must be used with caution for driving nuts and
bolts with socket set attachments. The technique is to start slowly,
increasing speed as the nut or bolt runs down. Set the nut or bolt snugly
by allowing the impacts to tighten the fastener over a period of time. ie
the longer the impacts, the tighter the fastener.
NOTE: Hold the impact driver firmly.
NOTE: When tightening a nut or a bolt always start the fastener by hand
by 2 or 3 threads BEFORE using the impact wrench.
NOTE: The longer the impact wrench is operated in the hammer function,
the tighter the fastener will become. 1 –2 seconds is normally sufficient
with small nuts, and bolts even less time.
