![]() The higher the voltage, the more powerful the tool. Like the wattage for corded tools, the voltage determines the power of cordless, or battery-powered, impact drills. In principle, corded tools are more powerful, but with a cordless drill you may access harder-to-reach spaces with ease. However, most drills do not come close to the precision and handiness of a good old screwdriver - especially for fine screwing. If you plan on using the machine primarily for screwing, you’ll need a model with a variable speed control. If you want to use an impact drill exclusively for drilling, your top priority should be the power. This means you always drill at the optimum speed for the material you are working on. This electronic system automatically keeps the drill speed at a consistent pace, regardless of the drilling load. It’s great if an impact drill has an adjustable speed setting, but what’s even better is the Bosch Constant Speed mechanism. The impact rate is determined by the number of teeth on the gear discs and is typically between 30,000 and 50,000 blows per minute. Some of the main factors that determine the efficiency of an impact drill include the power (measured in watts), the rotation speed, and the impact rate. The harder you press, the stronger you drill. Therefore, a high number of impacts is necessary to achieve a drilling effect.īecause the two discs are separated by a spring, the hammer action only takes effect if you apply pressure to the impact drill from behind so that the gear teeth can engage. This hammer action only acts over a few millimetres and is relatively weak. ![]() The characteristic drilling noise is caused by these toothed gears. It is produced by a mechanical percussion mechanism inside the machine, in which two sets of toothed gears, shaped like discs, "slide" over each other, causing the drill bit to move rapidly back and forth. This mechanism, which the cordless impact drill also has, is undoubtedly the special feature of these tools. Without this impact, you can bore holes into lighter materials (wood, metal, plastic, etc), but with the hammer action, harder materials - such as lightweight concrete or brick - can be penetrated. In addition to the normal rotary motion that every drill has, a hammer, or “percussion” function can be switched on to provide impacting blows. An impact drill - also known as an impact driver or combi drill - can be used for both drilling and screwing.
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