Abstract
A scale model stump cutter was made, and a system to measure cutting force, perpendicular force (Z-axial force) applied to the knife and the rotary angle of the knife-supporting arm was developed. It was shown that a clipper cut needs approximately 10% more cutting force than an anvil cut, by experiments using both single- and double-edged knives in the model stump cutter whose wedge angle changed incrementally from 25° to 60°. It was shown that the larger the wedge angle of the single-edged knife, the greater the decrease in the force perpendicular to the knife, as was suggested in the basic experiment previously reported. This was more obvious by using Fagus crenata Blume and Cryptomeria in these experiments.
