They are completely different
; impact drivers provide torsional
(rotational) impulses which act to
drive the fastener clockwise as the
screw advances into the material,
percussion (hammer drill) provides
linear impulses along the axis of the
bit that act to micro-shatter the
substrate (typically masonry) being
drilled .
A hammer drill works at a
lower stroke rate, but with
significantly greater impact
energy than a percussion drill.
This enables work to be
completed more quickly.
Hammer drilling in concrete
requires less force than percussion
drilling.
An impact drill uses lateral
percussion (from the side,
in a circular motion).
Once the drill senses
that torque is needed
, the drill uses impact to
twist the screw into the surface.
In short, an impact drill is used
for driving screws and bolts that
require a higher torque.
Impact drivers produce lots
of rotational force, capable of
driving the largest wood screws
in seconds. Internal mechanisms
allow impact drivers to produce
more torque than drills, and in
quick bursts. These bursts or “impacts”
happen up to 50 times a second,
giving impact drivers their name.
Can you use an impact driver
to drill into concrete? If you
drill holes that are less than
1/4 inch, an impact driver can
help drill through concrete and brick.
These tools have a massive amount
of torque. However, they are not built
to be used like hammer or
regular drills.
Percussion drilling is the
perfect choice if you need
to execute drilling in hard soils.
Hard soil has layers of rubble
or stones and percussion drilling
can effectively drill through it.
It is suitable for research on soil
pollution, grain size distribution,
general soil classification,
and profile description.
Percussion drilling is a drilling
method in which a heavy
hammering or cutting bit is
attached to a cable and
inserted into the borehole.
The heavy bit or hammer is
repeatedly lifted and dropped,
thus boring through the earth.
The hammer is made of hardened
steel with carbide on the chisel
-shaped bit.
