Chapter XIX: =drills and Cutters for Drilling Machines.=

=Jigs or Fixtures= for drilling machines 439
Limits of error in 439
Examples of, for simple work, as for links, &c. 440
Considerations in designing 440
For drilling engine cylinders 440 to 441
For cutting out steam ports 441
=Drills and Cutters= for drilling machines 442
Table of sizes of twist drills, and their shanks 442
Flat drills for drilling machines 442
Errors in grinding flat drills 443
The tit-drill 443
The lip drill 443
Cotter or keyway drills 446
=Drilling holes= true to location with flat drills 444
Drilling hard metal 444
Table of sizes of tapping holes 445
=Drill Shanks= and sockets 445
Improved form of drill shank 446
Square shanked drills and their disadvantages 446
=Drill Chucks= 446
=Stocks and Cutters= for drilling machines 447
Tube plate cutters 448
=Stocks and Cutters.= Adjustable stock and cutter 448
Facing tool with reamer pin 449
Counterbores for drilling machines 449
Drill and counterbore for wood work 449
Facing and countersink cutters 449
Device for drilling square holes 450
Device for drilling taper holes in a drilling machine 451