Lexicon DIY-Knowledge

Cordless Tools


Herramientas ACCU

Outils sans fil

The great variety of cordless power tools is still growing due to the development of yet more powerful rechargeable batteries. The most frequently used cordless power tools can be arranged according to the following main groups:
? power tools for drilling and screwdriving
? power tools for sawing
? power tools for sanding
? power tools for cutting
? Cordless power tools for machining
In addition there are cordless power tools for special applications and industrial production.

Power tools for drilling and screwdriving
Drilling and screwdriving are processes which require rather short time intervals of only a few seconds and a relatively low application of power. Technically speaking we are dealing with so-called intermittent periodic duty, i. e. work phases and breaks follow each-other, whereby the breaks correspond to the work phases or are even longer. The limited energy content of the battery allows you to accomplish a certain number of work cycles each one of which is by itself a complete work unit.
This type of operation suits cordless power tools and is the reason why by far the largest number of cordless power tools is available for drilling and screwdriving. Furthermore, the performance capability of battery-powered drills and screwdrivers has now reached the output power of small mainsoperated drills and screwdrivers.
(See also: Cordless drills, Cordless impact drills, Cordless screwdrivers, Cordless drill/drivers, Cordless impact drill/drivers, Cordless rotary-impact screwdrivers (impact wrenches), Cordless rotary hammers)

Cordless power tools for sawing
Sawing is an operational process which can last from a few seconds to several minutes of continuous operating time with a high demand for power depending on the individual working situation. This type of operation is not favourable for cordless power tools and has to be taken into account accordingly. Often the required working tasks cannot be fulfilled under extreme conditions since the battery is empty before the job is finished. This leads to frustration on behalf of the tool user. Battery-powered saws should only be applied in situations where the use of a mains-operated tool is not possible or where the performance capacity of the cordless saw is sufficient for the working task.
(See also: Cordless jigsaws, Cordless sabre saws, Cordless circular saws, Cordless cross-cut saws)

Cordless power tools for sanding
Like sawing, sanding is a working task which often requires longer load periods. This applies especially to surface sanding. Orbital sanders and random-orbit sanders are often in operation for periods lasting several minutes, but they only have an average demand for power. Angle grinders have a high removal rate, but also a very high power demand, especially during surface grinding. For most working applications of this type the battery capacity is insufficient. During abrasive cutting with an angle grinder the power demand is slightly reduced, especially if extremely thin cutting discs (1 mm max.) are used. In general, the same applies for battery-powered sanders/grinders as for battery-powered saws: their performance capacity cannot be compared with mainsoperated machines which have an unlimited power supply. This has to be remembered during application to avoid disappointing experiences.
(See also: Cordless orbital sanders and random-orbit sanders, Cordless angle grinders)

Cordless power tools for cutting
The power demand of power tools for metal cutting is considerably smaller than that of sawing or sanding machines. In addition, cutting usually requires less time. For this reason cordless machines have been established in this power tool segment for quite some time. The sheet metal processed in metalwork usually has a thickness between 0.6...1.5 mm. Most battery-powered sheet metal shears and nibblers have enough power to generate a cutting performance comparable to that of mains-powered machines.
However, if the thickness of the metal sheet exceeds 1.5 mm, the power demand increases dramatically and the use of battery-powered machines is no longer recommended.
(See also: Cordless sheet metal shears and nibblers, Cordless universal shears)

Cordless power tools for machining
The chip-producing processing (for example of wood) is a working task which requires as much power as sawing. The duty intervals during which the tool is in action also largely correspond to sawing. The actual power demand depends on
? chip thickness (cutting depth)
? feed rate
Although the work progress increases if the cutting depth and/or the feed rate are increased, the power consumption will also become higher. Basically the battery restricts the amount of energy available for the application of cordless power tools for machining. In order to make optimum use of the available battery power, one has to make compromises with regard to work progress. The chip thickness and the feed rate have to be considerably reduced in comparison to mains-powered machines.
(See also: Cordless planers)

Cordless special tools
As is the case with all power tools, there are also special tools available in the cordless machine segment. As a rule they are not produced in bulk and appear only in very small lot sizes on the market. Nevertheless, they are very important for some special users because they provide problem solutions for very special cases and applications. Out of the multitude of possible special versions, we will only mention the most important models:
? cordless lamps
? cordless air pumps
? cordless cartridge presses
? cordless blind-riveting machines
? cordless bolt cutters