Twin tenon corner¶

from woodwright.examples import joints

design = joints.twin_tenon_corner(stile_length=625)

stile  500 x 70 x 20 mm  oak
       - 2 x mortise 40 x 8 mm, 47 deep, in back_edge
rail   345 x 150 x 20 mm  oak
       - 2 tenons 40 x 8 mm, 45 long, 40 apart, on left_end

def twin_tenon_corner(
    stile_length: float = 500,
    rail_length: float = 300,
    stile_width: float = 70,
    rail_width: float = 150,
    outer_shoulder: float = 20,
    stock: Stock = OAK,
) -> Assembly:
    """A wide rail at a frame corner (e.g. the bottom rail of a door) with twin tenons.

    A single tenon as wide as the rail would need a long mortise weakening
    the stile, and would shrink and swell too much across its width; two
    tenons side by side, each in its own mortise, keep the material between
    them. The outer shoulder keeps the mortises away from the end of the stile.
    """
    asm = Assembly("twin_tenon_corner", root_location=STANDING)
    stile = asm.add(Board("stile", stock, length=stile_length, width=stile_width))
    rail = asm.add(Board("rail", stock, length=rail_length, width=rail_width))
    asm.join(
        MortiseTenon(
            tenon=rail.left_end,
            mortise=stile.back_edge,
            position=flush_with(stile.right_end),
            shoulder=(outer_shoulder, 10),  # the front edge is outer, at the end of the stile
            tenons=2,
            tenon_length=45,
        )
    )
    return asm