A hammer drill, also known as a "rotary hammer", "roto-drill" or "hammering drill", (see also rotary drill) is a rotary drill with a hammering action. The hammering action provides a short, rapid hammer thrust to pulverize relatively brittle material and provide quicker drilling with less effort. These tools are usually electric powered, but increasingly are also seen running off of cordless battery technology. The same technology is also used in electric "demolition hammers", also known as "chipping guns" or "breakers".
Read more about Hammer Drill: Types of Hammer Drills: "Cam-Action" (Percussion) and "Electro-Pneumatic", Use, Rotary Hammers, History
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—Robert Benchley (1889–1945)
“Swift blazing flag of the regiment,
Eagle with crest of red and gold,
These men were born to drill and die.
Point for them the virtue of slaughter,
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And a field where a thousand corpses lie.”
—Stephen Crane (1871–1900)