The function of a hammer drill

Drilling as a physical movement in itself is a rotation. The spiral-shaped drill flutes "eat into" the drilling substance. Axial pressure forces accelerate the penetration. In the case of massive and hard drilling substances such as concrete and stone, short and powerful "knocking strokes" of the hammer drill help to move forward.

Three force generation variants

A hammer drill (€ 90.95 at Amazon *) is manufactured with three different drive types. In the DIY sector, electrically and pneumatically driven striking mechanisms can be selected. In professional high-performance areas such as mining, the function of compressed air in pneumatic systems is taken over by hydraulically acting fluids.

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Since steel reinforcements can often be hit when drilling in building concrete, gear adjustments with regard to the force distribution are possible with high-quality rotary hammers.

Drill and power transmission

In contrast to a hammer drill, the drill moves in the drill chuck. It absorbs the power of the striking mechanism directly in its own movements. In a hammer drill (€ 151.38 at Amazon *), the firmly locked drill in action with the drill chuck takes over the impact force of the hammer mechanism.

A hammer drill applies blows to the drill shaft. The force is generated in a piston by compression and triggers the firing pin. The drive bearing or an eccentric wheel diverts the rotational energy of the motor, which is already present, into the required forward and backward movements.


The impact mechanism of a hammer drill outperforms the performance of a drill, especially because of the direct power transmission to the drill. The motor and lever force "loses " less energy up to the pressure point at the drill tip. The performance of the spring hammer mechanism or the pneumatic hammer mechanism works free of collateral damage.

When a hammer drill is used to penetrate concrete, the force applied is like a woodpecker clamped in a fan. When drilling in concrete with a hammer drill, the power transmission can be compared to the repeated manual pressing of a mixer rod onto the drilling site.

Tips & Tricks If you are wondering whether it is better to use a hammer drill or a hammer drill, the amount of work is the most important factor. For common household drillings in concrete or stone, a hammer drill is usually sufficient, but it requires significantly more muscle power and can reach its performance limit with particularly stable drilling substances.