Indexing
Indexing. The process of bringing a blank into the exact position at every cycle of the press for striking with coining dies. On some coining presses the mechanism that accomplishes this is a large flat circular disk (called an indexing plate) with circular apertures at it's edge. These receive a blank and move it along until it is exactly in place for positioning the blank for striking.
excerpted with permission from
An Encyclopedia of Coin and Medal Technology
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor