Drawn-down. Decreased in diameter, width or thickness, by forging or swaging.
Drawn-out. Increased in length, by forging or swaging.
Drift. A tool that cuts the walls of a hole while it is driven through by hammer blows.
Drift-pin. A taper pin that is used by boiler makers to drive through holes that do not come fair, or match properly.
Drill. A tool to pierce holes.
Drill-chuck. A chuck used to hold drills.
Drilling-machine. A machine for drilling holes in metal.
Driver. 1. A device for driving work in the lathe and sometimes called a dog or carrier. 2. A gear wheel which drives another.
Drop-hammer. A forging or stamping hammer which is lifted by power and let fall of its own weight.
Drunken thread. A screw thread that is not a true spiral, but is waved in its course.