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Hammer drilling in concrete
How well combination drills, with hammer action, drill through concrete. We aim to drill 50mm holes and we record how quickly the drills can do this.
Rotary drilling in stone
How well the drills sink holes in sandstone. We use 6mm bits and aim to reach 30mm.
Rotary drilling in wood
How well the drills sink holes in beech. We use a 6mm drill bit and aim to reach a depth of 40mm.
Rotary drilling in metal
How well the drills drive holes in steel. We use a 6mm bit and aim for a depth of 6mm.
Screwdriving in wood
How well the drills drive screws into pine.
This is based on the number of holes and screws that a drill can sink and drive on a full and a quick-charge. It also takes into account the difference between the actual and the stated discharge times as well as the amount of energy discharged from the battery after not being used for a month.
Combination drills provide rotary drilling, screwdriving and hammer drilling for very hard surfaces such as concrete. Drill drivers can drill wood, metal and stone and drive srews in, but they can't drill concrete.
Drill weight (kg)
We weigh drills with the battery attached. There can be upto 1.5kg difference in weight between the lightest and the heaviest. drills.
Drill voltage (V)
Drill voltage varies - drills with a higher voltage are usually more powerful.
Rated capacity (Ah)
The rated capacity of each battery is shown in Amp hours (Ah)
Number of gears
Drills with two gears will do a better overall job of drilling and screwdriving than drills with just one.
Lithium Ion (Li Ion) batteries provide the better energy storage for cordless drills than Nickel-cadmium (Ni Cd)
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