A wood grinder is a piece of equipment used to disintegrate wood and other soft organic substances into small portions It employs rotating blades hammers or discs of high velocity and speed to reduce timber waste including branches logs as well as construction waste into smaller parts These machines are used mainly in places that deal with cutting trees and in the recycling industries to produce wood chips mulch or sawdust which can be recycled for uses such as composting biofuels or landscaping