Ra′di-al Drill′ing-ma-chine′.
An upright machine, designed for drilling a series of holes without changing the position of the work. In Thorne, De Haren & Co.'s, the arm a carrying the drill and its gearing is rotatable on the collar b surrounding the upper part of the fixed post c, on which are the driving-pulleys. The counter-shaft is at the base, and the belt by which they are driven is changed from the loose to the fast pulley and rice versa by the belt-shifter d. The table e is slotted at top and sides, and can be raised or lowered to suit the work, by a pinion working in the rack f and operated by the crank g. The drill may be traversed back and forth on the arm a by a rack and pinion, and is provided with automatic changeable feed-gears; or the feed motion may be controlled by the hand-wheel h through a worm on its shaft, which gears with a worm-wheel whose shaft carries a pinion meshing with the feeding-rack i. See also horizontal lathe; boring-machine; drill.| Radial-piston water-wheel. |

