Crown 3-1/4" - 18

This engaging 3-1/4" - 18 crown mould measures 3.248" width by .750" thickness, requiring a 3-1/2" wide blank of four-quarter lumber for milling sprung (laying horizontally flat) on a commercial moulder. The attractive terminating profile comprises a 9/16" vertical line segment on the top left. The tall line connects to a 1-7/64" concave semicircle, tangent of a 47/64" convex arc creates the lovely cyma recta in the center. The s-shaped curvature attaches to a 35/64" tall by 7/64" wide area for installing a decorative rope moulding, with a15/32" quarter-round on the design's bottom right corner. The spring angles are at forty-five degrees; the dedicated back bevels keep the face sides of the pattern parallel to the wall and ceiling. These specific angle positions lock in the installed height at 2-7/16" tall with a 2-5/32" projection across the top.

Review our commentary about axial constant positioning for crown bevels, the article will help you dial this profile in axially, provided the machine is adequately calibrated. Two high points in the pattern layout were deliberately positioned on the same plane; our disciplined design features will assure excellent hold-down conditions while milling as long as the pressure shoe is parallel to the machine bed-plates.