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Slot-drill′ing ma-chine′.

A machine for forming elongated holes by drilling instead of punching, as in the slotting-machine. The latter leaves the work in a rough and unfinished condition, while, when the former is used, no after-treatment with the file is required.

Fig. 5207 illustrates the machine employed in drilling the cotter-hole in a steam-engine cross-head.

The drill-spindle a is supported on a carriage b, to which the requisite traverse is imparted by connecting it to a stud on the face of a revolving disk, the extent of motion being determined by the distance from the center of the disk at which the stud is fixed.

To insure uniformity of motion to the carriage, the pinion driving the disk is eccentric and the disk itself elliptical.

The drills c d, the latter having two loose cutters fixed by screws, and the rose-cutters e f for finishing, are employed in this machine.

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