Lexicon DIY-Knowledge

Ratchet-controlled impact mechanism


Mecanismo percutor de trinquete

Percussion mécanique de frappe à crabots

The ratchet-controlled impact mecanism generates the rotary-percussive action in impact drills. One of the two serrated and hardened ratchet discs is driven by the motor, the other one is firmly attached to the machine housing. In drill-only mode the ratchet discs are kept apart, whereas in impact mode the discs come into contact under the applied operator pressure.

The number of individual ratchet grooves on the disc surface determines the impact rate; the impact rate can vary from 30 000 to 50 000 impacts per minute depending on the type of machine.