Published at Sunday, 12 August 2018. Impact Driver. By Carmela Boone.
Several manufacturers like Makita Tools have included two or more speed ranges in their impact drivers. Sometimes, too much power is not always a good thing. You can destroy small screw heads and break screw shafts. The more power used, the less battery life. Just because you have a 400 HP motor under the hood of your car does not mean that you drive around town with the accelerator pedal to the floor.
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.
BPM stands for "blows per minute". This is the number of screws that will be driven into a surface in 60 seconds. This is also another factor that should not be taken lightly. The higher the number of blows the better; this will determine the time that you will take to cover a particular area either drilling holes or screwing. The recommended capacity of blows is 2500 and above.
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