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British Dictionary definitions for indexing head

indexing head

noun
  1. a circular plate mounted to rotate on its centre, inscribed with concentric circles, each accurately divided, the dimensions being marked by drilled holes. The plate can be moved round with a workpiece to facilitate the accurate location of holes or other machining operations on the workpiece
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012