Masonry Magazine February 2007 Page. 36
POWER TOOLS
The guys who are going to see the value are safety directors. Their users and employees are exposed to less vibration. Eric Fernandes, Milwaukee Electric Tool Corporation.
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Milwaukee Rotary Hammer 5369
Vibration Control System, called SHOCKS. The system places shock absorbers between the handle and the hammer mechanism to reduce the vibration felt by the user. Also, an anti-slip comfort grip on the hammers is designed to reduce fatigue during extended use.
For added versatility, the 18-volt rotary hammer has a dual-mode hammer drill and rotary drill, while the 24-volt and 36-volt offer an added chipping function, Bernstein said. DeWalt is planning to re-launch additional SDS hammers this month that will have "25 percent greater performance, are more powerful, and harder hitting," he said.
The Milwaukee Electric Tool Corporation in Brookfield, Wis., recently unveiled two, one-inch SDS rotary hammers with an Anti-Vibration System (AVS). Contractors may not perceive a lot of vibration with the smaller tools, but even small vibrations over long periods of time can cause user fatigue, said Eric Fernandes, product manager for rotary hammers for Milwaukee.
As we started talking to users of the small SDS class, we found they don't hit as hard because of the smaller bit, but they're used more frequently," Fernandes said. "The guys who are going to see the value are safety directors. Their users and employees are exposed to less vibration."
Both of Milwaukee's new models (5363-21 and 5369-21) have three modes of operation- hammer drill, drill and chipping- and a variable-speed trigger and reverse switch for accurate drill bit starting.
Easier-to-hold Ergonomic Handle, Less Fatigue
HANDLE DESIGN also is playing a crucial role in rotary hammers. After conducting research on ergonomics, DeWalt found that 80 percent of users prefer the L-shape handle. "It changes the center of gravity and balance, and it doesn't put any stress on the user's wrist," Bernstein said. "The L-shape gives it the ability to get into tight spots. For drilling overhead, it gets the user's hand closer to the work area."
DeWalt's new hammers that feature the L-shape handle are only 10-1/2 inches in length and weigh less than seven pounds. "Weight means comfort, and comfort means productivity," Bernstein said, adding that the L-shape adds about $50 to the cost of the hammer.