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Active hammering

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A rotary hammer is a power tool that can perform heavy-duty tasks such as drilling and chiseling hard materials. However, rotary hammers use a piston mechanism instead of a special clutch. This causes them to deliver a much more powerful hammer blow, making it possible to drill bigger holes much faster. Compared to Active hammering advanced power units known as hammer drillsrotary hammers tend to be larger and provide a bigger impact force by utilizing a technology called the "electro-pneumatic" Active hammering hammering mechanism, because it is powered directly by electricity instead of a separate air compressor.

Rotary hammers have two pistons — a drive piston, and a flying piston.

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An electric motor turns Active hammering crank, which moves the drive piston back and forth in a cylinder. The flying piston is at the other end of the same cylinder. The pistons do not actually touch, but the air pressure in the EP cylinder allows for a much more efficient transfer of hammering energy than springs in the cam-action style hammer drills.

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The majority of modern rotary hammers as well as all electric-powered chipping guns or jack-hammers all utilize this EP technology. Modern units allow the hammer and rotation functions Active hammering be used separately or in combination, i.

When used in the hammer mode, the tool provides a drilling function similar to a jackhammer. The type of work they do means that they require a "slip-clutch" which engages when the drill bit jams and sufficient torque is Active hammering onto the "slip-clutch" mechanism.

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This stops the violent wrenching motion that a drill without a clutch would cause when stopped suddenly from full speed, protecting the drill from damage. The slip-clutch Active hammering protects the operator, but does not always prevent injury.

Some manufacturers have introduced additional technology to protect the operator. Hilti has a technology called "ATC" or "Active Torque Control" Active hammering which works by disengaging the drive from the motor when the tool body begins to rotate excessively through the action of a secondary magnetic clutch in addition to the standard slip-clutch.

DeWALT has a related system called "CTC" or "Complete Active hammering Control" [4] which utilizes a two-position slip-clutch so that the operator can select the lower torque setting for greater safety.

A number of "special shanks" have been developed by various manufacturers. Over the years a fair Active hammering of these proprietary systems evolved, but the remaining shanks in use today are: These shanks were developed in order to allow for the bit to "slide" back and forth while rotating, so that the drill bit can efficiently transfer the force of the electro-pneumatic hammering mechanism to the working surface.


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