Tech Talk
What are "Drills, Drill Bits, Drilling Tools"?
End-cutting tool for drilling. Tool has shank, body, and angled face with cutting edges that drill the hole. Drills range in size from "microdrills" a few thousandths of an inch in diameter up to spade drills, which may cut holes several inches in diameter. Drills may have tapered shanks with a driving tang, and fit directly into a spindle or adapter, or they may have straight shanks and be chuck mounted. The rake angle varies with the material drilled. Styles include twist drills, straight flute drills, half round and flat drills, oil hole drills, and specials.
