rotary-percussive drill

rotary-percussive drill

[′rōd·ə·rē pər′kəs·iv ′dril]
(mechanical engineering)
Drilling machine which operates as a rotary machine by the action of repeated blows to the bit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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A low reaction rotary-percussive drill may also be used.