Fig. 188 shows a vertical drilling machine of a type much used. The drill is carried in a socket in the lower end of the vertical spindle VV. The spindle is made to revolve by a belt on the cones CC, and is fed gradually downward either by the power-feed mechanism driven by a belt over the small cones 88, or by the hand lever L which may be swung down horizontally for convenient handling. Both power and hand feeds may be readily thrown out of gear when the spindle is to be quickly raised or lowered by the hand wheel II. The spindle moves up and down in a vertical direction.

Fig. 188. - Vertical Drill.

Work to be drilled rests on the table T, or may rest on the base F. The faces of both the table and the base are horizontal, hence are always perpendicular to the direction of travel of the drill. The table may be adjusted vertically or swung horizontally as desired. 20

A shop usually has a small vertical drill fed only by hand and used for drilling holes of 14-inch diameter or less. This is known as a sensitive drill.

Gang drills and multiple spindle drills have several spindles and drill several holes at the same time.

Fig. 189. - Full-Universal Radial Drill.