A cordless drill should not be in any today (Handyman-) household missing. It makes screwdriving easier and is suitable for drilling in wood and metal. The offer of the manufacturers ranges from small, handy machines with 7.2 volt battery packs to powerful cordless drill drivers 24 Volt. The more volts a battery pack has, the more battery cells with each 1,2 Volt hate is. And unfortunately, it is usually all the more difficult. Together with the capacity of the battery cells in ampere hours (Ah) The energy reserve is calculated using the formula voltage x capacity.
However, the performance of the cordless drill driver depends on it, what the manufacturer makes of it. Usually machines with more volts are stronger. But a high voltage can be deceptive: In particular, cheap screwdrivers with a 1-speed gearbox often deliver a lower torque than smaller screwdrivers with two or even three gears, even at high voltage. The first gear is used for powerful screwdriving, the second gear for fast drilling. machines with 14,4 Volt and 2-speed gearbox are a sensible compromise given the current state of the art.
An automatic spindle lock makes it easier together with a keyless chuck (SSB) the tool change. Torque pre-selection is used to screw in smaller screws evenly. Ten levels are enough. For very thick screws you have to select the drilling level anyway.
SHOPPING TIP
■ Mehr Volt heißt nicht automatisch mehr Leistung, but only more weight. However, the higher voltage is usually also used for more powerful motors. It is best to buy a machine, which only has so many volts, as you really need. Devices with a 14.4 volt battery pack are now considered a sensible compromise.
■ Wenn Sie auch Bohren wollen, pay attention to a gearbox with two gears. It enables a much more effective implementation of the engine power for screwdriving (1. Gang) and drilling (2. Gang).
■ Lassen Sie sich von den Drehmomentangaben der Hersteller nicht blenden. Some only give the much higher values for the hard screwdriving application. The soft screw joint is practical.
■ Eine automatische Spindelarretierung ermöglicht den schnellen Werkzeugwechsel mit einer Hand.