Tool Mark Identification

Thesetoolsinclude hammerschiselsand diestamps

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Unformatted text preview: aws © Precision Forensic Testing Hammers Claw hammers get their name from the split rear area of the hammer used to pull nails. These are the most common hammers available and come in a variety of shapes and sizes. © Precision Forensic Testing Hammers In addition to the face of the hammer, the rear claws can be used as a tool. List the class characteristics of a hammer. © Precision Forensic Testing Tools – Classification Tools can also be classified according to type of action it imparts on the work piece. The action affects the marks left on the work piece. Examples of different types of actions include: Compression Flat Action Gripping Shearing Slicing © Precision Forensic Testing Tools ­ Compression Compression tools are designed to compress by pressure or impact. These tools include hammers, chisels, and die stamps. © Precision Forensic Testing Tools – Flat Action Flat action tools work in parallel to the working surface. These types of tools include screwdrivers, pry bars and tire irons. © Precision Forensic Testing Tools – Gripping Action These tools use opposing jaws to squeeze or hold an object. Tools in this category include vise grips, tongue and groove pliers, and pipe wrenches. They are also called serrated jaw gripping tools. © Precision Forensic Testing Tools ­ Pinching Action These tools use opposed jaws which are designed to cut using a pinching action. Examples of these types of tools include bolt cutters and diagonal cutters. © Precision Forensic Testing Tools – Shearing Action Shearing tools use two blades on adjacent planes that pass by each other and are designed to cut. These types of tools include sciss...
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This note was uploaded on 04/09/2011 for the course CHEM 4461 taught by Professor Max during the Spring '08 term at Lamar University.

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