What Is A Cordless Impact Driver?
Use It To Drill or Loosen Screws
With a good cordless impact driver, you can deliver a strong rotational force, which is useful for loosening screws and bolts that are over-torqued. It is also possible to use cordless impact drivers for drilling, but most carpenters, mechanics, and other users of impact drivers will primarily use them for fastening or loosening screws. In the past few years, several of the major electric cordless tool makers have started to come out with impact drivers that are not marketed strictly to mechanics, but more so to carpenters. Whatever your need for using a cordless impact driver, you want to make sure that you purchase an electric cordless impact driver that has enough power to make up for any human fatigue that could be present in a job.
A common power output by most modern cordless drills is 18volt, which tend to do a great job of drilling screws. However, they will still start to bog down when driving really long screws into tough wood. If you run into a situation like this, do not bring extra damage to your drill by trying to continue drill the screw, as this could lead to a stalled and overheating motor. Cordless impact drivers, on the other hand, don't do this. Instead, they use a motor-driven hammer to repeatedly strike an anvil that drives the output shaft. It will automatically switch to a rapid-fire hammer strike as the load increases, so that every impact turns the screw a bit farther, while the motor continues to spin and bring in cool air. Pretty neat, right?
What Can A Cordless Impact Driver Do For Me?
Many people are so satisfied with their 18volt drills that they do not see any reason to buy an impact driver. But if you have a job that requires you to drive a lot of construction screws and lag bolts, then a good electric cordless impact driver is a godsend. A drill simply cannot drive them as easily or quickly as an impact driver. Owners of brands of cordless impact drivers such as DeWalt and Makita have long understood that these tools can be among the most useful of any power tool. Cordless impact drivers are absolutely necessary for driving lag screws, but are also a great choice when you have a less demanding task like running deck screws. Something that impact drivers are not designed for, but do well at anyway is boring large holes, depending on if you insert the right bit into it. A great electric cordless impact driver is also much better at removing rusty and stripped screws than a drill.
Cordless Impact Driver Design Features
What To Look For
When shopping for a new electric cordless impact driver (also called an impact gun), you should search for a model of this tool that is comfortable to handle. After all, whatever task you are performing, you will likely be repeating that task quite a bit, such as having to drive a whole series of three-inch screws rapid succession. For that kind of work, you want to be able to just gently squeeze the trigger and get quick and comfortable response from your impact driver. And there should be a different amount of torque from your impact driver based on how much pressure is applied to the trigger. Some impact drivers are available as models with distinct speed settings, but these generally cost a lot more than a variable speed model. If you get a feel for your impact driver, you should be able to get absolute control of the tool through the variable speed trigger.
Another design benefit that is standard for most cordless impact drivers is a light that helps you see exactly what you are driving...very useful in darkened spaces with poor natural lighting.
Other quick things to look for when shopping for a cordless impact driver are long-lasting batteries that are easy to change, and the ability to accept existing bits that you want to use with your impact driver. Some examples of these are vix bits and drill bits. And there are also a scale of batteries to consider. Nicads will not last for many charging cycles, NiMH are better on average, but L-Ion batteries are considered the best for use with impact drivers.
So, if you need a tool that you will rarely use for drilling, but much more for fastening and loosening screws and bolts, then a cordless impact driver should be your tool of choice. Whether you get an impact driver that is 9.6volt, 12volt, or even the powerful 18volt. If you treat your electric cordless impact driver right, you will probably not wear it out completely for many years. And for professionals putting this type of tool to work all day, every day, that is important.