CHAPTER XVII.

=PLANING MACHINERY.=

=The Sellers= planing machine 406 The belt shifting mechanism 406, 407 The automatic feed motions 408 =Sliding Head= 408 =Cross Bar= 409 =Slides of Planers=, the various forms of construction of 410 =Wear of the Slides= of planer heads, various methods of taking up the 410 =Swivel Heads= 411 =Tool Aprons= 411 =Swivel Tool-holding devices= for planers 411 =Planer Heads=, graduations of 412 Safety devices for 413 Feed motions for 414 V-guideways for 414 Flat guideways for 415 Oiling devices for 415 =Planing Machine Tables= 415 Slots and holes in planing machine tables 416 Forms of bolts for planer tables 417 Supplementary tables for planer tables 417 Angle plates for planer tables 418 Chucking devices for planer tables 418 =Planer Centres= 418 =Planer Chucks= 419 For spiral grooved work 419 For curved work 420 Chucking machine beds on planer tables 420 For large planing machines 422 Chucking the halves of large pulleys on a planer 423 =Gauges= for planing V-guideways in machine beds 421 Planing guideways in machine beds 422 Gauge for planer tools 424 =Planer Tools=, the shapes of 424 For coarse finishing feeds 424 The clearance of 424 For slotted work 424 =Planer Tool Holder=, with tool post 425 Various applications of 425 Simple and advantageous form of 426 Examples of application of 426