ring-and-circle shear

ring-and-circle shear

[¦riŋ ən ¦sər·kəl ‚shir]
(design engineering)
A rotary shear designed for cutting circles and rings where the edge of the metal sheet cannot be used as a start.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.