Electric powered tools come in a variety of sizes from about 12 lbs - 65 lbs. They require an external power source, but do not require a compressor. Although in the past these tools did not have the power of an air or pneumatic hammer, this is changing with newer brushless-motor tools coming close to the power of a pneumatic tool and in some cases even matching it. Electric powered tools are useful for locations where access to a compressor is limited or impractical, such as inside a building, in a crowded construction site, or in a remote location.
Bfbreakerstools use a variety of chucks for attaching chisels, but the most common are SDS-max, 7/8" Hex, TE-S, and 1-1/8" Hex. The connection end size is also related to the breaking energy of the tool. For example, the Bosch and Hilti 12 lb tools both use SDS-max, while the Bosch, Hilti, and Makita 65 lbs tools all use 1-1/8" Hex connection. (See Wikipedia article on hammer drills for more on bfbreakershammering)
Hydraulic
An excavator-mounted hydraulic jackhammer used to break up concrete.
A hydraulic jackhammer, generally much larger than portable ones, may be fitted to mechanical excavators or backhoes and is widely used for roadwork, quarrying and general demolition or construction groundwork. These larger machine mounted breakers are known as Rig Mounted, or Machine Mounted Breakers. Such tools can also be used against vertical walls (or ceilings for that matter), since the vehicles involved are massive enough and powerful enough to exert the forces involved without needing the help of gravity in operating the tool. Pneumatic or hydraulic tools are particularly likely to be used in mines where there is an explosion risk (such as underground coal mines), since they lack any high-power electrical circuitry that might cause a triggering spark.
Hydraulic breakers usually use a hydraulic motor driving a sealed pneumatic hammer system, as a hydraulic hammer would develop a low strike speed and transfer unacceptable shock loads to the pump system.
Advances in technology have allowed for portable Hydraulic Breaker Hammers. The jackhammer is connected with hydraulic hoses to a portable hydraulic powerpack: either a petrol or diesel engine driving a hydraulic pump; or a mini-excavator or skid-steer via a power take-off driveshaft to the machine's hydraulic system. Hydraulic power sources are more efficient than air compressors, making the kit smaller, cheaper or more powerful than a comparable pneumatic version.
Related readings: bfbreakers, aolongtrucks, automansafety, gachntech, cbmsteelpallet
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