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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 breakers. 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.
Chisels may be resharpened in a shop or with an angle grinder with grinding disc. After resharpening, they must then be heat treated to restore the integrity of the steel before use.
Self-sharpening polygon and flat chisels are also available. Although some pneumatic jackhammers now have a silencer around the barrel of the tool, the primary noise source comes from the chisel striking the object being removed.
Use has been linked to Raynaud syndrome ; in particular, prolonged exposure to the pronounced vibration conducted by the tool can lead to a secondary form of the syndrome known as vibration white finger.
Applying athletic tape is not very effective in preventing white finger but seems to help alleviate some of its discomfort.
Pneumatic drill usage can also lead to a predisposition for development of carpal tunnel syndrome.
Some manufacturers of electro-pneumatic tools now offer vibration reduction systems to reduce the vibration felt by the operator.
Other manufacturers such as Makita , DeWalt and Bosch also offer electric tools with vibration dampening. Using a jackhammer to break up concrete pavement may expose the operator to hazardous dust containing respirable crystalline silica.
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Three things you need to consider when choosing a jackhammer are weight, impact rate, and impact force. The impact rate is the number of hammer strikes the tool delivers.
Some manufacturers give the figure as BPM — beats or blows per minute. Others use impacts per minute IPM. Figures range from 1, to 1, Some makers choose not to give a figure.
The actual impact force is undoubtedly more important in terms of the jackhammer's ability to break through material, but we still like to know the impact rate; it's the combination of the two that gives the best clue to overall performance.
Historically, the power of jackhammers were rated by weight — a pound tool would be chosen for breaking three-inch-thick concrete, a pound tool for breaking six-inch-thick concrete, and so on.
Though modern electric jackhammers no longer follow this standard, a heavier tool is still going to provide more force.
On the other hand, you can use a lighter, less-forceful tool for longer. If you have small, dense areas, a heavy tool is more effective.
If you have large, thin areas, a lighter tool is better. The impact force is the actual amount of energy transmitted with each blow. With jackhammers, impact force has traditionally been rated in joules.
However, because that's an infrequently used unit of measurement, many manufacturers quote foot pounds ft. Impact force is an area where inexpensive jackhammers sometimes deliver figures as high as the pricier ones.
Ranges vary from 45 to 60 joules, or 33 to 44 ft. While bigger impact forces result in more demolishing power, those impacts are felt through the handles.
As a result, powerful impacts can make the jackhammer more difficult to control. The power of the electric motor might seem like an important aspect, but most of these tools are over 11 amps, which is plenty.
If all other things are equal, then a stronger motor is arguably more durable. Jackhammers tend to get pretty rough treatment.
Metal casings give more protection than plastic ones. A long cord is useful. If you need an extension cord, make sure it's of sufficient diameter to transmit the required voltage safely.
Although you should try to work with the jackhammer in a nearly vertical position, that's not always possible. An auxiliary side handle is a big benefit when working at an angle.
A non-standard size could restrict your choice when you're looking for replacements. Some high-quality jackhammers have a soft start, which helps you maintain control and accuracy.