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Power drill

This really is a truly universal machine as, apart from its main perforating function and by attaching accessories, it serves to screw/unscrew, knock, acts as an impulsor of abrasive or polishing tools, etc. It has an electric motor distinguishing it from the ones using a direct or alternating current. The alternating current ones can either be synchronous or asynchronous. The asynchronous ones, called induction drills, are the ones that are mostly used. The motors can be single-phased or tri-phased, the higher powered ones being used in industry. Its ergonomically designed casing is gun-shaped. Another fundamental part of this machine is its bit holding head.