Toolmarks made by lathe chuck jaws

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Presentation transcript:

Toolmarks made by lathe chuck jaws Nir Finkelstein, Ayal Aronson, Tsadok Tsach Forensic Science International Volume 275, Pages 124-127 (June 2017) DOI: 10.1016/j.forsciint.2017.03.004 Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 1 Two of the 45 improvised rifle barrels in various stages of manufacturing. One measuring 65 and the other 75cm long. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 2 (a) Three-jaw chuck body (φ160mm max 250n/min); (b) three jaws removed from the chuck. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 3 A lead sheet with impression marks, after being taken off the sample rod. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 4 One set of evenly-spaced longitudinal impression marks found on two of the impounded barrels. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 5 Three sets of jaw impressions, made on the lead sheets by one of the impounded chucks; note individual characteristics. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 6 Class characteristics for Barrel A, Barrel B, and a set of replicated jaw impressions. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions

Fig. 7 Comparing individual characteristics of the replicated jaw impressions to the impressions found on Barrel B (comparison microscope; mag. ×60). Arrows indicate matches. Forensic Science International 2017 275, 124-127DOI: (10.1016/j.forsciint.2017.03.004) Copyright © 2017 Elsevier B.V. Terms and Conditions