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Video of How an Impact Driver Works

By Rain Noe - January 3, 2014

Of the power tools I own, this diminutive Makita impact driver is one of my favorites. I recently had to install a Murphy Bed and this thing drove lag screws into the subfloor like I was hammering brad nails. As someone who cut his teeth with bulky, cordless, keyed-chuck power drills with no hammering action, that something this small could pack so much punch has always amazed me.

I always pictured a powerful little leprechaun inside making the magic happen; but as it turns out, the impact mechanism's a bit more prosaic. Nick Moore, whose YouTube channel is dedicated to sharing "Science on a budget, [to] take a closer look at the world we live in," cut the housing away on an impact driver extension to show you how it works. Pretty cool:

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Rain Noe

I’m a lapsed industrial designer. I was born in NYC and figured I’d die there, but a few years ago I abandoned New York to live on a farm in the countryside with my wife. We have six dogs.