How does a rotary hammer work?

What is a rotary hammer?

The rotary hammer is a machine tool similar to the drill that is used to make holes in parts or surfaces. Unlike the drill, the rotary hammer allows you to move forward and backward, which allows you to drill harder surfaces.

What is a rotary hammer for?

The rotary hammer is a machine that is used to carry out heavy drilling work, such as drilling concrete , masonry and construction materials .

It also has the tapping function moving back and forth, allowing you to screw parts that probably cannot be done manually or take much longer.

How does a rotary hammer work?

Through a source of electrical energy , in some cases a battery , in others alternating current from the network, it is fed to an electric motor . It transfers a rotary motion to a connecting rod .

The connecting rod transforms the circular movement of the shaft connected to the motor, into a linear movement of the main piston of the rotary hammer. The movement of this piston strikes against the percussion piston. Then it hits against the stem. The stem is the one who transmits the blow to the bit or chisel .

When the pistons collide, they change direction of movement, repeating this movement until the engine stops.

Parts of a rotary hammer



  1. Wick holder: It is the one who holds the wick or chisel to be used to perform the drilling.
  2. Stem: It is in charge of transferring the movement from the piston to the wick.
  3. Piston protector: It is the coating that is given to the pistons.
  4. Handle: Allows you to better hold the rotary hammer with both hands
  5. Safety button: Does not allow the rotary hammer to start for any reason if the button is pressed.
  6. On/Off Button: Turns the motor on and off.
  7. Handle: Allows you to hold the rotary hammer with one hand.

Types of rotary hammer

  • Electronic rotary hammer: It has a weight of approx. 4kg Used in places where it is difficult to reach thanks to its easy mobility. It allows drilling materials such as wood and steel .
  • Rotary hammer TE: It has an average weight of 3.9 kg. Allows drilling walls, bricks or floors.
  • New Generation Rotary Hammer: It fulfills the function of drilling but can also be used for screwing and unscrewing. They have greater durability.
  •  Li-On battery rotary hammer : It weighs 3.5 kg and can drill on any type of surface.
  • Battery rotary hammer: It has a weight of 5 kg. It has a system that eliminates dust, which allows a better vision to work. They are durable and have greater autonomy.
  • Combined rotary hammer: It weighs about 4 kg and has a greater power than the other rotary hammers. It can be used to drill from wood to metal. It can also carry out chiselling and finishing works.

Differences between drill and rotary hammer 

Although both machines are used for drilling, they have different functions and characteristics.

  • The rotary hammer can drill into harder surfaces where the drill cannot.
  • The rotary hammer drills 6 times faster than the drill.
  • The drill has a cheaper market price than the rotary hammer.

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