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. 2020 Feb 7;20(3):885. doi: 10.3390/s20030885

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Wavelet packet features for different cutting conditions (a) CC1; (b) CC2; (c) CC3; (d) CC4; (e) CC5 from 1^st hole to last hole before drill breakage.