Fixed-knife pressure-bar planing method reduces or eliminates subsurface damage

Yellow-poplar and hard maple specimens conditioned at 8 percent MC were surfaced with a fixed-knife pressure-bar combination after abrasive and knife planing (peripheral milling). The rake and clearance angles for the fixed-knife system were 52-1/2 and 0 degrees, respectively. The stock was fed with the grain parallel to the feed direction and 2 degrees from parallel to the knife edge. The nominal depth of cut was 0.020-inch with a 0.015-inch vertical gap between the knife edge and pressure bar. Surface quality was evaluated visually and by scanning electron microscopy. The fixed-knife pressure-bar technique reduced or eliminated subsurface crushing and edge tear out.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member