Fig. 90. PILLAR TYPE OF POWER DRILL
A drill press makes drilling an easier and a more accurate operation than when a lathe is used for this purpose. A pillar type of power drill is shown in Fig. 90. It is so constructed that the drill can be rotated at any one of a number of speeds and by means of a guide-rod it is caused to advance into the metal automatically at the proper speed.
Fig. 91. A PLANER FOR SURFACING METAL WORK
A planer, see Fig. 91, is a machine for turning up flat surfaces, cutting slots and the like in metal parts. A planer is made up of a bed, a table in which the work is clamped and which slides back and forth on the bed by means of a feed motion; a slide-rest, which carries the cutting tool, is held above the bed by an upright frame and this moves to and fro across the table.
Fig. 92. A SHAPER FOR SHAPING UP METAL WORK
There are several kinds of shapers made and Fig. 92 shows one of them. A shaper cannot only be used for planing, but for turning, boring and slotting. In a shaper the work is held in a fixed position on the table, which can be raised and lowered by a hoisting screw, and the tool is made to move across the table by a quick-acting return motion.
There is also an arbor on which the work is mounted where a circular cut is to be made. The cutter head has a vertical adjusting screw with a worm feed and an index plate so that it can be set to any ratio. In a shop where only small work is to be done a planer may be dispensed with and a shaper used instead.