Portable drills are generally small enough to be lifted, carried, and operated by one person, and are often hand-held. Portable drills may be brought to the piece which is to be machined. Portable drills are operated by mounting a drill bit into the chuck of the drill, bringing the bit into alignment with the surface to be drilled at the desired position and angle of the hole, and rotating the drill bit so as to bore into the surface.
One disadvantage inherent to portable drills is that they are imprecise; they do not reliably place the hole where it is desired to be.
