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"By managing where and when the power is desired, we can provide fuel savings, emissions and productivity enhancements," Orr said. "With control of an accessory independent of engine speed, we can reduce accessory drag on an engine during engine cranking to enhance cold weather starting. Starting an electric engine oil pump just prior to engine dewaltpowertools cranking, for example, can provide a pre-lube function."Orr was describing the concept of Cat Electronics'' MorElectric system unveiled about a year ago. The MorElectric system is designed to drive a vehicle''s air conditioner, brake air compressor, water pump and other accessories electrically, versus being belt or gear driven. The system also includes a newly developed HVAC (heating, ventilation, air conditioning) package as well as an optional diesel-powered auxiliary power unit.

Rotary hammers, on the other hand, are primarily used for drilling masonry. They typically deliver far fewer blows per minute (bpm) than hammer drills, but thanks to an internal pneumatic piston that delivers the impact energy directly to the bit, each blow is several times as powerful. A hammer drill is better at making holes in masonry than a conventional drill, but a rotary hammer is much more efficient than either.Size of Holes?Hole size is another important consideration, and this is reflected in the size and type of chuck provided with each type of tool. Hammer drills are equipped with standard dewaltpowertools three-jaw chucks. As with a conventional drill, the size indicates the largest shank it will accept. Half-inch hammer drills are most common.