Published at Friday, 24 August 2018. Impact Driver. By Verna Ramos.
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.
When they first came out years ago, impact drivers were very popular in Japan but it took a while for Americans to realize what a terrific advantage impact drivers have over an electric drill when it comes to driving long screws into wood, especially decking. American companies like Porter Cable caught on to the idea and started competing with impact drivers offered by overseas companies. The idea for impact drivers was born long ago with the inventions of (1) the impact wrench, used in every automotive garage, and (2) the hammer drill used to power masonry bits into concrete and other extremely hard materials.
Over the years, these drivers have been improved to the point of near perfection and this includes the batteries that power them. Battery size has grown from 9.6 volts to 18 volts and more. More than that, battery life has been greatly extended from what it was with the advent of Lithium Ion technology and subsequent improvements on that. In fact, a significant part of the cost of any impact driver, whether it comes from Makita Tools, Bosch or DeWalt is the battery or batteries that come with it.
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