Drill bits have a conical cutting point and a
shaft with one or more flutes-the helical grooves that run down the exterior of
the tool.
CNC machining
Drill bits typically come in three varieties-center, twist, and
ejector drills- with each type having different important functions.
You should use center drill bits to precisely
create small spots on the workpiece, which can then be drilled properly using a
twist drill.
In contrast, ejector drills are better suited for deep hole
drilling.
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