Indexing head
From Wikipedia, the free encyclopedia
An indexing head (also called a dividing head) is a specialized tool that allows a workpiece to be indexed in the rotational sense—that is, easily and precisely rotated to any angle or circular division.
The tool is similar to a rotary table except that it is designed to be adjustable through at least 90° (in fact it will travel to approximately 95°).
The workpiece can be held with a collet in the indexing head, or between centers with the help of an accompanying tailstock (sometimes called a footstock).
[edit] Indexing plates
Simple indexing consists of a series of preset holes in a backing plate, these divisions are provided for the most common angles (such as 90 °, 45 °, 30 °, etc). The remaining divisions of a circle are provided by manually rotating the dividing arm using index plates. Tables or calculations are required to use this method.
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