The drill screw driver enters set of necessary electric tools for the house, garage, the dacha. Accumulator versions of this device possess wide range of application and are easy to use.
Instruction
1. Pay attention when choosing drill screw driver to two main parameres — quantity of turns and torsion torque. The maximum revolutions per minute are maximum speed of rotation of the engine and, respectively, drill or replaceable bat. For the screw driver 400-500 revolutions per minute there are enough, the drill has to have this parameter about 1200-1300. Check whether the chosen tool has possibility of switching of rotational speed of the engine, whether the drill is equipped with reverse (back run). The maximum torsion torque is effort which the drill is capable to develop or overcome. At models this parameter is averaged by 5-10 N*m. The high torsion torque guarantees easy drilling of firm surfaces.
2. Pay special attention when choosing the tool to accumulator type. There are three types of accumulators — nickel-cadmium, metal-gidridnye and lithium-ion. The first option though is most widespread, but is less eco-friendly. The term of work depends on its design, operating mode and is from 100 to 9000 cycles of discharge charge. Metall-gidridnye accumulators badly maintain big current, but have smaller dimensions, term of their service of 300-500 cycles. Li-ion batteries the most powerful, number of cycles 500-1000, but they do not transfer very low temperatures. Consider also that nickel accumulators need to be discharged completely before charging, otherwise their capacity will be lost.
3. Choose the accumulator with bigger capacity if you want the drill to work as long as possible without recharge. Models with the spare accumulator are presented at the market. While one is in work, the second is loaded. The considerable value plays accumulator charging time. It can make of 40 minutes till 7 o'clock.
4. Check as the engine of drill works under loading as well it holds the chosen quantity of turns what power gives at accumulator unloading. If at shop there is test stand, surely check the chosen drill screw driver in practice.