If you want more accurate torque control, get a drill/driver or a combi drill. This is the reason why impact drivers are primarily used for loosening nuts, bolts, and screws. The only control you have is on speed which you can vary using the control trigger. Keep in mind that there is no option to change the torque on an impact driver. You can see more details in the impact driver vs hammer drill article. In the latter, the hammering action is applied only at the rear end of the drill and not in the rotational direction. Note: Do not get confused impact driver with a hammer drill. So, if you are having issues getting a screw through tough material, then you may want to try swapping out a cordless drill for an impact driver. As a result, the energy stored in the spring is also transferred to the head along the linear axis.Īn impact driver gives a blow to the screw around 50 times a second, which produces upwards of 5 times more torque than your average cordless drill. In the video, you can see that when the spring forces the hammer down it releases with an impact on to the output shaft. Here is a video that explains the working principle of an impact driver. This concussive blows to the spindle results in very high torque to the spindle. It then hammer hits the output shaft transferring the rotational torque to it and this is repeated. The hammer mechanism lifts-up and rotates around and then is pushed down by the spring. When the motor alone is unable to provide torque to fasten or unfasten a screw, the spring-loaded hammering mechanism actuates. That is essentially what an impact driver does. Imagine while you are turning a screw, you started tapping it with a hammer in the direction of rotation. If you have no idea what that means, picture it this way. Impact drivers essentially work by combining the rotational motion with a hammering action to generate high torque. Impact drivers are highly useful for construction workers, cabinet makers and jobs that require the use of a large number of fasteners.
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