Difference Between Rotary Hammer And Hammer Drill

- Nov 29, 2017 -

The mechanism is quite different.

A hammer drill - the sort of machine that many handypersons have - work by having a pair of toothed wheels facing each other. Those wheels look like little ratchets that turn relative to the other, and after a few degrees of rotation, all of a sudden collapse against each other. The wheels are clearly visible in the following image. Trying to drill holes bigger that (say) 8mm in hard material with such a drill is a route to baldness, and the use of uninspired language.

A rotary hammer drill on the other hand is something that every handy person should aspire to owning. And cheap ones are quite effective. For instance, we drilled a number of 16mm holes in 32MPa concrete with hard aggregate a week ago, and it took 15 seconds to drill 120mm. Each time. No fuss, and no sweat. And that was by no means a big machine.

A rotary hammer drill has a piston mechanism which produces a very much more powerful impact. They also rotate much slower than a typical hammer drill.

They also require a different style of tungsten carbide drill bit, and they typically have a different style of shank, known as SDS.

Wonderful investment


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