Amana Tool 46100 Solid Carbide Spiral Plunge 1/8 Dia x 1/2 x 1/4 Inch Shank Up-Cut cutters and rabbet cutter as shown

and rabbet cutter as shown in the solid drawing to cut the tongue

Using the optional 3/8" bearing #47702 (sold separately) produces a profile with a fillet at the convex end of the curve

setting it tangent to the trim cutters

the angle stop is attached to the guide rail in an instant and without tools

Amana Tool 46100 Solid Carbide Spiral Plunge 1/8 Dia x 1/2 x 1/4 Inch Shank Up-Cut cutters and rabbet cutter as shownSpiral flute bits combine a shearing action in cutting with an augering action in chip clearance. The shearing action yields an especially clean accurate cut while the augering action clears chips from the cut. The Up Cut shears from the bottom up pulling chips from the bottom up thus allowing deeper penetration with less stress on the tool. An excellent choice for mortising. Special unique carbide grade increased clearance geometry and razor sharp