An indexing head:-
also known as a dividing head or spiral head,is a specialized
tool that allows a workpiece to be circularly indexed; that is,
easily and precisely rotated to preset angles or circular
divisions.
Indexing heads are usually used on the tables of milling
machines, but may be used on many other machine tools
including drill presses, grinders, and boring machines.
Common jobs for a dividing head include machining the
flutes of a milling cutter, cutting the teeth of a gear, milling
curved slots, or drilling a bolt hole circle around the
circumference of a part.
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