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A hammer drill is a powerful tool that uses rapid
hammering movements to drill holes into solid materials quickly. Apart from softer
materials such as wood, hardened plastic, or metal, hammer drills are used to
drill into harder objects like stone, masonry, and concrete. Unlike
conventional electrical hammer drills, cordless drills are powered through
Rechargeable batteries. Therefore, they do not have a power cord, eliminating
the need to be connected to a power source. The cordless feature makes these
tools more portable and can be used at any location. Cordless hammer drills
enhance the speed of operation as well conserve energy when drilling through
exceptionally hard materials. These drills are great for the home user, as well
as for professionals such as carpenters, masons, building contractors,
plumbers, and electricians.
Features and workings of a cordless hammer drill
The hammer drill works through a back and forth motion of the chuck, which
is the anterior portion of the drill. Embedded tightly in the chuck is the
drill bit. For each rotation of the chuck, it also moves forward and backward,
generating a ‘jack-hammering’ effect between the drill bit and the surface,
initiating efficient drilling. Some hammer drills have a function that allows
the user to replace the drill bit with a screwdriver bit, turning the drill
into a driver to drive screws into a particular material.
The drilling action of a hammer drill emits a torque varying between
approximately 300 inch lbs. to 600 inch lbs. The torque rating can be adjusted
by the user depending on the task to be performed. An electronic variable speed
control feature further enhances the control in the hands of the user. Some
cordless hammer drills have three selectable modes for more customization of
operation; rotation only, rotary hammer, and hammer only. An integral clutch
lowers the possibility of any torque reaction.
Since the chuck is normally the most important part of the drill, it comes
with a steel reinforced collar that protects the chuck in the event of an
accident. To ease bit changing and to also ensure rigid holding of the bit, a
ratcheting, single sleeve 1/2 inch chuck having carbide teeth is incorporated.
The drill also incorporates a keyless chuck that allows the user to easily
change the drill bits.
A uni-body power train aligns the chuck, the gearbox, and the motor,
providing for the most efficient drive train system. To prevent burnout of the
motor during prolonged use, a built-in overload protection feature is installed.
Some drills have a three-speed facility, the first speed being approximately
450 revolutions per minute (rpm), the second speed being around 1400 rpm, and
the third speed being more than 2000 rpm. The blow per minute (bpm) rating
could go even higher than 34,000.
The voltage of the tool ranges from around 14.4 to 24 volts. The weight of
the tool varies between approximately 5 to 8 pounds.
The cordless hammer drill uses extended run-time batteries to ensure longer
battery life and also greater run-time. If the tool uses a Litheon 36 V
battery, a Litheon fast charger is also shipped in the package which offers 80
percent charging in as little as 30 minutes.
What to look for in a cordless hammer drill
Depending on the intended use of the tool, the user can choose a cordless
hammer drill based on power rating and the overall weight of the tool. For
better gripping of the drill bit in the chuck, a magnetic bit holder is always
an advantage. Some of these drills have a 360 degree side handle to provide a
two handed grip, enabling more stable operation and better targeting.
The body of the drill should be a reinforced sturdy material for better
durability and impact resistance. Additionally, the handle of the tool should
be ergonomically contoured with a soft rubberized padding to ensure a
comfortable but firm grip. The location of the trigger and the other controls
should be located in a position that permits the user to easily manipulate the
various buttons even while tool is in use.
Most of the drills ship with spare drill bits and screwdriver bits. The
carrying case of the tool has a sturdy construction to allow safe and
convenient portability of the drill from one place to another.
Some popular manufacturers of the cordless hammer drill include Bosch and
Dewalt.
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