Effect of anvil position on cutting force and energy measurements of a disc chipper

Cutting force measured from anvil's strain represents one impact for each half disc turn because the disc has two knives, whereas chipper energy supply is similar to a sinus curve. Cutting force depends of wood specie, diameter, infeed volume rates and anvil vertical position. Higher the wood infeed volume rate and diameter are, higher the cutting forces are. A disc chipper efficiency is estimated as the ratio of the cutting energy and the chipper energy supply.