Take a moment and think about what a rotary hammer does. Yeah, it makes holes in materials like concrete by spinning fast — that’s the rotary part. It also slams the tip of the drill bit into the surface up to 4,300 times per minute. But not all of that energy finds its way to the surface; some of it gets transferred back to the operator — oh, my aching joints!
The point behind Dewalt’s new SHOCKS system is to reduce the amount of vibration transferred to the operator. To accomplish this, they mount the rear handle of the tool on shocks. They claim this reduces strain and fatigue, and increases control of the tool.
DeWalt has several rotary hammers in this new line, but let’s take a look at an entry model, the D25223K. The 7-lb. tool uses an overload-protected 8A motor to spin the drill from 0 to 1,150 RPM. The hammering action can be set from 0 to 4,300 BPM and will deliver up to 2.5 ft-lbs. of impact energy. A three-mode selector switch lets you choose between rotary hammer, rotary only, and hammer only.
Pricing for the D25223K Rotary Hammer starts at $240 shipped.