CHAPTER XVIII.

=DRILLING MACHINES.=

=Drilling Machines.= General description of a power drilling machine 428 Lever feed 428 With automatic and quick return feed motions 428 Improved, with simple belt and uniform motion, two series of rates of automatic feed, and guide for boring bar 429, 430 Radial 430, 431 For boiler shells 436 Cotter or keyway 438 Drilling Machine, three-spindle 434 Four-spindle 434 =Drilling and Boring= machine 431 Feed motion of 432 =Combined Drilling Machine= and lathe 433 =Boring Machine=, horizontal 433 For car wheels 438 For pulleys 438 =Quartering Machine= 434 =Drilling and Turning Machine= for boiler makers 435 Feed motions of 436