Indexing head
From Freepedia
Image:IndexingHead-Tailstock.jpg An indexing head is a specialized tool that allows a work piece to be rotated to any angle 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 over travel to approx 95°).
Indexing plates
Image:IndexingPlatesStyle1.jpg Image:IndexingHead-SimplePlate.jpg 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 maually rotating the dividing arm using index plates. Tables or calculations are required to use this method.
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