{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T21:57:32Z","timestamp":1780351052000,"version":"3.54.1"},"reference-count":27,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,4,16]],"date-time":"2021-04-16T00:00:00Z","timestamp":1618531200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003661","name":"Korea Institute for Advancement of Technology","doi-asserted-by":"publisher","award":["P0002092"],"award-info":[{"award-number":["P0002092"]}],"id":[{"id":"10.13039\/501100003661","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2020R1F1A107292611"],"award-info":[{"award-number":["2020R1F1A107292611"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, a novel drill bit breakage prediction method featuring a low-cost commercial infrared sensor to monitor drill bit corner wear is proposed. In the proposed method, the drill bit outer corner wear state can be monitored by measuring reflected infrared light because the reflection phenomenon is influenced by wear, edge shape, and surface roughness of the drill bit. In the experiments, a titanium workpiece was drilled without using cutting fluid to accelerate drill bit fracture. After drilling a hole in the workpiece, reflected infrared light was measured for the drill bit rotating at 100 rpm. Collected data on intensity of infrared light reflected from the circumferential surface of the drill bit versus the rotation angle of the drill bit were considered to predict tool breakage; two significant positions to predict tool breakage were found from the reflected infrared light graphs. By defining gradient vectors from the slopes of the reflected infrared light curves, a reliable criterion for determining drill bit breakage could be established. The proposed method offers possibilities for new measurement and analysis methods that have not been used in conventional tool wear and damage studies. The advantage of the proposed method is that the measurement device is easy to install and the measured signal is resistant to electromagnetic noise and ambient temperature because optical fiber is used as the signal transmission medium. It also eliminates the need for complex analysis of the measured signal, eliminating the need for a high-performance analyzer and reducing analysis time.<\/jats:p>","DOI":"10.3390\/s21082808","type":"journal-article","created":{"date-parts":[[2021,4,19]],"date-time":"2021-04-19T06:35:53Z","timestamp":1618814153000},"page":"2808","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Prediction of Drill Bit Breakage Using an Infrared Sensor"],"prefix":"10.3390","volume":"21","author":[{"given":"Min-Jae","family":"Jeong","sequence":"first","affiliation":[{"name":"Dry Strip Division Dry Strip System Group, PSK Inc., Hwaseong 18449, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3265-4581","authenticated-orcid":false,"given":"Sang-Woo","family":"Lee","sequence":"additional","affiliation":[{"name":"Interdisciplinary Program in Biohealth-Machinery Convergence Engineering, Kangwon National University, Chuncheon 24341, Korea"},{"name":"The Advanced Education Center of Convergence Technology in Personalized Smart Healthcare System for Active Seniors, Kangwon National University, Chuncheon 24341, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9252-9187","authenticated-orcid":false,"given":"Woong-Ki","family":"Jang","sequence":"additional","affiliation":[{"name":"The Advanced Education Center of Convergence Technology in Personalized Smart Healthcare System for Active Seniors, Kangwon National University, Chuncheon 24341, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyung-Jin","family":"Kim","sequence":"additional","affiliation":[{"name":"Dry Strip Division Dry Strip System Group, PSK Inc., Hwaseong 18449, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Young-Ho","family":"Seo","sequence":"additional","affiliation":[{"name":"Interdisciplinary Program in Biohealth-Machinery Convergence Engineering, Kangwon National University, Chuncheon 24341, Korea"},{"name":"The Advanced Education Center of Convergence Technology in Personalized Smart Healthcare System for Active Seniors, Kangwon National University, Chuncheon 24341, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byeong-Hee","family":"Kim","sequence":"additional","affiliation":[{"name":"Interdisciplinary Program in Biohealth-Machinery Convergence Engineering, Kangwon National University, Chuncheon 24341, Korea"},{"name":"The Advanced Education Center of Convergence Technology in Personalized Smart Healthcare System for Active Seniors, Kangwon National University, Chuncheon 24341, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,16]]},"reference":[{"key":"ref_1","unstructured":"(2018, January 01). 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