Sorry you appear to be confusing Hammer & Impact action
Impact drills work in a slightly different way to Hammer drills.
They add force to the drill bit but in a different direction than that of a hammer drill.
Basically an impact drill has a mechanism called an anvil that provides increased torque or force applied perpendicular to the bit.
Instead of just pushing the bit harder into the material as a hammer action would, it spins the bit with more power.
This is done automatically when when the thread encounters strong resistance, typically it gives the ability to drive very long screws into material with less effort and less fear of stripping the heads.
Date published: 2016-01-20