Control of Veneer Thickness During Rotary Cutting

A major cause of thickness variation of rotary-cut veneer is a reversal of the forces between the knife carriage and the wood, depending on whether or not the pressure bar is contacting the wood. At the start of peeling and when the bar is opened during cutting, as when clearing splinters, the knife carriage and the wood bolt are pulled together. In contrast, when the pressure bar is contacting the bolt, the knife carriage and wood bolt are forced apart. The data show that uniformity of veneer thickness can be improved by keeping all moving parts of the lathe close fitting, keeping the pressure bar shut during round-up and throughout the cutting, using low nose bar pressure, and preloading the knife carriage against the wood bolt.

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