![]() I don’t know what you consider a “large” job, but for us, it’s anything requiring more than a dozen holes or enough holes over a certain size. Even the added weight (these tools typically outweigh their hammer drill counterparts) is more than made up for by the faster drilling speeds. Over 1/4″ and we really prefer the speed and flexibility of a rotary hammer. That also plays into the size of holes you want to drill with these tools.įor 1/8″ up to 1/4″ holes, a hammer drill should serve you well unless you plan on drilling dozens of them. They simply don’t do the job well-and rotary hammers have become quite affordable. You don’t want to use these tools full-time for drilling lots of holes. Hammer drills function as “part-time” concrete drilling tools. The best rotary hammers use advanced timing to synchronize the impacts and rotation for even better performance. That drives the bit forward quickly even as the electric motor spins the bit rotationally. Rotary hammers use a drive piston that exerts air pressure to a flying piston. While a hammer drill “vibrates” its way into the surface, a rotary hammer pounds away with a whole lot more force. The reason rotary hammers drill so much faster than a hammer drill comes courtesy of their robust internals. You also never use a rotary hammer to drive fasteners, whereas a hammer drill can do double duty. You can also find spline bits, but they are much less common and more or less obsolete.Ī rotary hammer usually dwarfs a hammer drill in size and the shape doesn’t really resemble a typical drill. These bits slide and lock into the rotary hammer chuck and don’t require a chuck key or any other tool to insert or remove. Hilti has alternate names for these, but they’re fully compatible. ![]() The rotary hammer uses either SDS-Plus or SDS-Max bits. ![]() This combination bits much more strongly than a hammer drill. A piston system and air pressure drive the bit into the concrete or masonry material. It both drives the bit forward into the material being drilled while also turning the bit much like a drill. A rotary hammer engages in several actions simultaneously. ![]()
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