A hammer drill, also known as a percussion drill or impact drill, is a power tool used chiefly for drilling in hard materials. It is a type of rotary drill with an impact mechanism that generates a hammering motion.

What is percussion drilling?

Percussion drilling is a drilling method which involves lifting and dropping heavy tools to break rock, and uses steel casing tubes to stop the borehole from collapsing. Percussion drilling is carried out by breaking up the formation by repeated blows of a heavy bit or a chisel inside a casing pipe.

What is the difference between a percussion drill and an SDS drill?

Hammer Drills, also known as Impact or Percussion drills, have a specially designed clutch that allows it to not only spin the drill bit, but also to punch it in and out. ... SDS Rotary Hammers are similar to Hammer Drills in that they also pound the drill bit in and out while it's spinning.