Effects of Edge Bluntness in the Cutting of Wood

Cutting end-grain of wood requires power consumption and is associated with the difficulty of developing satisfactory surfaces. A relatively sharp edge has a radius which can be considered negligible when compared with cell wall thickness. Edge radius is an adequate criterion for bluntness until wear is advanced. Assuming that for an ideally sharp cutter the cutting force is proportional to chip thickness and is dependent on rake angle, it was then shown that the ratio of the force resulting from bluntness to that force associated from ideal sharpness was in close agreement with the ratio of the square root of edge radius to the chip thickness within the range of practical conditions.

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