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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.

SHOCKS [DeWalt]
D25223K [DeWalt]
Street Pricing [Google Products]
Amazon(B003J5W4ZC) [What’s This?]

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6 Responses to Rotary Hammers With Active Vibration Control

  1. fred says:

    Wonder how this compares to Makita’s AVT claims of reduced vibration.? The idea of isolating the handle seems very basic – and probably fits into the “why didn’t they do that before” category. It would also seem to have a potential application for recip saws. Will have to see how this tool gets rated in actual use.

  2. Phil says:

    I have an older Milwaukee SDS drill that has a similar setup with a shock isolated handle, I figured it was mostly standard by now.

  3. Richard says:

    Wouldn’t this actually be passive vibration reduction? It seems active vibration reduction would require a counterweight or some arrangement to counter the forces.

  4. JH says:

    Well if the handle has a mass of its own and is connected to the frame through springs, it can be considered an active damper.

  5. busf says:

    Makita’s AVT is in their larger SDS Max shank hammers and is basically a counter balance system. Very similar to what is found in Hilti. DeWalt focus on the handles of their hammers to “counter” vibrations from the tool and application. Bosch actually engineers and designs vibration control into the hammer mechanism of their SDS Max hammers. They change the compression ratios and shaft length to achieve vibration control and they also add similar shock handles for added vibration protection.

    I’ve used all of the hammers in question. Bosch and Makita are the best in vibration control followed by Hilti, then DeWalt. Bosch hits harder than Makita and has a legacy of long life in real world conditions. So I give the edge to bosch’s 11264EVS hammer. However they currently do not have sds plus vibration control corded hammers only one cordless hammer has vibration control.

  6. Squidlow says:

    Doesn’t Metabo also claim the same thing — a sort of anti-fatigue for the operator?

    I think there’s a regulation in the European Community about power tools used for industry having featured designed significantly reduce operator fatigue (and by extension) injury over the long-term for those who do that kind of work all day, every day.

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