How to Does an Impact Driver Work

Impact drivers are the best power tool when it comes to fastening and unfastening, impact drivers require less effort than what is required from a drill or electric screwdriver when fastening and unfastening. Why are impact drivers so efficient at this task, below, we will look at how impact drivers work to help you better understand why they are better than drills or electric screwdrivers.

Impact drivers are different because they use what is known as rotational hammering function. The best way to explain it is using the following example:

Imagine you are trying to loosen the lug nuts on your car wheels. You are using a large wrench to try and twist the bolt off, but it has been screwed on so tightly that it will not budge.

It needs more torque to be taken off. The solution is to hit the end of the wrench with a hammer as hard as you can and as many times as you can until it loosens.

Impact driver does the same thing, if it encounters any resistance when trying to unscrew or even screw for that matter. It has an internal mechanism that hits the rotational part of the driver up to 50 times a second in some impact drivers. This helps it to produce enough torque to loosen or drive in any stubborn screws or bolts.

This tool does not rely purely on the spinning mechanism (RPM) to screw or unscrew, it has a hammering function, not to be mistaken with the hammering function on a hammer drill, which kicks in when things get tough.

This hammering function also greatly reduces the risk of stripping the screw head. When you only have high RPM at your disposal, the screwdriver bit starts to slip and eventually strip the screw head.

With the hammer function also known as impacts per minute, you can reduce the RPM via the trigger and relay on the hammer function fasten and unfasten screws without stripping the screw head.

High RPM only has the ability to spin fast without much torque behind it to loosen screws without stripping them

The internal hammering function in an impact driver is what makes it so efficient at fastening and unfastening, driving screws into wood and various other materials. This is the basics of how an impact driver works.

As you can see, the other popular fastening and unfastening power tools miss this hammering feature (hammer function in a drill is completely different to impact drivers), that is why an impact driver delivers better results for fastening and unfastening, regardless of if it is screws, bolts, nuts or driving screws directly into timber. If you currently do not have an impact driver and are planning to do a lot of fastening and unfastening, get one! As it will make the job so much easier.

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Arthur Allen has been using all sorts of power tools for the last 27 years, gaining a lot of experience on how they work, how to determine what makes a power good, and becoming an expert on the subject through many years of real world trial and error. Not only is Arthur and expert in tools, but various building jobs as well.