Dovetail half lap¶

from woodwright.examples import joints

design = joints.dovetail_half_lap(stile_length=375)

stile  300 x 40 x 20 mm  oak
       - dovetail socket 28.6 to 40 mm, 10 deep, 1:7, in bottom_face
rail   240 x 40 x 20 mm  oak
       - dovetail lap 10 mm thick, 40 long, 28.6 wide at the shoulder, 1:7, on left_end

def dovetail_half_lap(
    stile_length: float = 300, rail_length: float = 200, width: float = 40, stock: Stock = OAK
) -> Assembly:
    """A T-shaped dovetailed half lap: the lap on the rail cut to a tail, wider at
    its end than at the shoulder, in a socket of its shape across the stile.

    Unlike a plain half lap it holds even if the rail is pulled along its
    length, e.g. a cross rail pulled by a sagging top. The tail shows on the
    face towards the viewer.
    """
    asm = Assembly("dovetail_half_lap", root_location=STANDING)
    stile = asm.add(Board("stile", stock, length=stile_length, width=width))
    rail = asm.add(Board("rail", stock, length=rail_length, width=width))
    asm.join(DovetailHalfLap(lap=rail.left_end, socket=stile.back_edge))
    return asm