Abstract: A wood working knife for use in a wood working machine, comprising a knife body having a first cutting edge and an opposed second cutting edge, the knife body having a first clamping surface and a second clamping surface. The first clamping surface has opposed clamping features separated by a middle section, the opposed clamping features and the middle section being sized and shaped such that, upon the knife body being inserted into a clamping assembly, the clamping forces are localized towards the opposed cutting edges and away from the middle section.

Abstract: A wood processing device having a spinning wood processing head having one or more spaced apart knives mounted on said spinning head for processing wood. The knives, upon contacting said wood, form a curved cut surface in said wood being processed. At least one limit surface is adjustably mounted between said one or more knives on said spinning head, said limit surface being sized and shaped to limit abnormal movement of said wood during processing. An adjustor for adjusting a position of said limit surface is provided to permit said limit surface to limit abnormal movement of said wood over a range of operating conditions. In a preferred embodiment the limiter is curved. A method of adjusting a wood processing head is also disclosed.