Instrument for Measuring Knife Pitch Angle on Veneer Lathes

The instrument which was developed at the Eastern Canadian Forest Products Laboratory to read and set knife pitch angle, is comprised of a short section of aluminum angle with four bubble-type level tubes mounted within slots milled in one leg and with Alnico button magnets inset in the other leg for ready adherence to the veneer knife. The prototype instrument has level tubes set to indicate four fixed angles covering the range normally required for hardwood and softwood veneer production, i.e., 89? 00″, 89? 30′, 90? 00′ and 90? 30′. For mills peeling very thin veneers, the preset angles should range from 90? 00′ to 91? 30′. Level tubes have a sensitivity of 5 minutes between markings. The engraved face plates indicating the knife pitch angle of each level tube are “lamincord” plastic on the prototype, but stainless steel is recommended for instruments in commercial use.

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