Center drill bits, occasionally known as Slocombe drill bits, are used in metalworking to provide a starting hole for a larger-sized drill bit or to make a conical indentation in the end of a workpiece in which to mount a lathe center.
A center drill is used for drilling a hole on the axis of a shaft to hold it between centers. It was also used to drill center holes on machining centers, but has been replaced by the spot drill (which has a simpler geometry) for this purpose.
Centre drills create an accurate centre hole to locate a live centre. They can also be used for spotting or starting a precise hole, which will also give a chamfer on the hole. For precise centering work on CNC machines. Made from a carbide substrate.
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