
Tool wear describes the gradual failure of cutting tools due to regular operation. It is a term often associated with tipped tools, tool bits, or drill bits that are used with machine tools. Types of wear include: Can be caused by spindle speed that is too low or a feed rate that is too high. In orthogonal cutting this typically occurs where the t...
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http://en.wikipedia.org/wiki/Tool_wear

A gradual deterioration of tools and dies. In the case of fabrication of stainless steels, the surface oxides of the stainless gradually either abrade or build up on the tooling. Other factors (high hardness,non-metallic inclusions) can also accelerate tool wear.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
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