helical rake angle

helical rake angle

[′hel·ə·kəl ′rāk ‚aŋ·gəl]
(design engineering)
The angle between the axis of a reamer and a plane tangent to its helical cutting edge; also applied to milling cutters.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.