Abstract: A multi-sectional drilling and tapping apparatus includes a shank, a drill and a tap that are made in one piece. The shank is formed at an end while the drill is formed at another end. The drill includes a small section formed between a tip and a large section. The drill further includes helical blades extending to the shank from the tip. The tap includes helical ribs each extending from a corresponding one of the helical blades and groups of tooth-shaped blades each evenly arranged along a corresponding one of the helical ribs. The tap includes a diameter larger than that of the large section of the drill.

Abstract: An iron-cutting drill includes a shank and two threaded section. The first threaded section extends from an end of the shank and includes a helical groove made of a helix angle smaller than 45°. The second threaded section extends from the first threaded section and includes several helical grooves, a cavity, several apertures and several blades. The helical grooves of the second section are in communication with the helical groove of the first threaded section. The helical grooves of the second section are made with a helix angle larger than 45°. The cavity is axially made in a free end of the second threaded section. The apertures are in communication with the cavity. The blades are formed around the cavity.

Abstract: A drilling machine includes a frame, a control unit, a drilling unit and a cable assembly. The control unit is connected to the frame. The drilling unit is movably supported on the frame. The cable assembly electrically connects the control unit to the drilling unit. The cable assembly is substantially concealed by and between the frame and the drilling unit.

Abstract: A drilling machine includes a frame, a control unit, a drilling unit and a cable assembly. The control unit is connected to the frame. The drilling unit is movably supported on the frame. The cable assembly electrically connects the control unit to the drilling unit. The cable assembly is substantially concealed by and between the frame and the drilling unit.