This document identifies and defines terms used, illustrates configurations, and gives a nomenclature of components for machine-fed woody biomass reduction chippers, grinders, and shredders used in forestry. It aims to establish a uniform description of the various configurations of these types of forestry machines.

Machines covered by this document include:

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drum chippers;

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disc chippers;

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screw chippers;

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horizontal grinders;

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tub grinders;

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shredders.

Chippers, grinders, and shredders that are manually fed are not covered by this document.