Published at Saturday, 25 August 2018. Impact Driver. By Lorie Grimes.
The technology that allows them to do this is sometimes referred to as "hammer and anvil" meaning that, unlike the simple twisting action of an electric drill, the impact driver literally "pounds" the screwdriver bit around as if being repeatedly being hit by a hammer. This action gives these woodworking tools tremendous power that simply would not be possible if the same screwdriver bit were chucked up in an electric drill with the same size motor and battery. An additional advantage is that there are hex shank drill bits available so that your impact driver can double as a quick-change cordless drill thus becoming one of your most versatile woodworking tools.
So you have already engineered a deck, but now you've got to disassemble the old deck before you rebuild. There's not much worse than 15 year old rusty looking screws that are buried in wood. You'll be able to tell in a glance that they don't want to turn. And you know from experience that a drill will end up stripping half of them, if you are lucky.
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.
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