Published at Friday, 24 August 2018. Impact Driver. By Elvia Merritt.
Impact drivers pack a lot more punch than screwdrivers. Using a motor or compressed air, it's able to generate a lot faster spin and a repeating "punch" that other tools can't duplicate. If you're slightly confused about the spin and punch, think about it this way. You're driving a screw into a board with a screwdriver. In comes your partner with a rubber mallet. Every few seconds, your partner slams the back of your tool. That impact increases the driving force of the tool considerable. Not only is the tool spinning and driving the screw with more torque, the constant pounding ensures the screw will make it through the material.
Conversely, impact drivers have the power to loosen them up while not stripping those heads - which you already knew if you were paying attention.
The next thing you need to consider is the speed of the driver. The best combination is high torque and high maximum speed. Speed is measured in RPM or revolutions-per-minute. This is the amount of times your bit will spin around per minute. Look for an impact with a higher max RPM. This will help you drive those long screws through the hardest of materials at a faster rate. Any impact driver with 2200 or more RPM is considered fast.
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