NIJ Training Course for Firearm Examiners: Ultrasonic Machining as a Metal Forming Technique
An interactive tool used to supplement the NIJ online training course entitled 'Firearm Examiner Training', as outlined in the thirteenth learning module, 'Toolmark Identification'. This brief animation demonstrates a metal-forming technique called ultrasonic machining which combines sound waves with a slurry abrasive material for the controlled machining of a surface.
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