Wedged round tenon¶

from woodwright.examples import joints

design = joints.wedged_round_tenon(leg_length=500)

seat   300 x 300 x 30 mm  oak
       - through hole ø25, in bottom_face, centered
leg    ø40 x 430 mm  oak
       - round tenon ø25, 30 long, a saw kerf 2 mm, 20 deep, for a wedge, on right_end
wedge  20 x 6 x 24 mm  oak
       - taper 2 mm on front_edge towards right_end
       - taper 2 mm on back_edge towards right_end

def wedged_round_tenon(
    leg_length: float = 400, diameter: float = 25, kerf: float = 2, flare: float = 2
) -> Assembly:
    """A round leg through a stool's seat, held by a wedge in a kerf across
    the grain of the seat.

    The wedge is two thirds of the seat long, at its head as wide as the
    kerf and the spread both ways, and 24 mm thick, so that its corners
    stay within the 25 mm tenon.
    """
    asm = Assembly("wedged_round_tenon")
    seat = asm.add(Board("seat", THICK_OAK, length=300, width=300))
    leg = asm.add(Rod("leg", ROUND_LEG_OAK, length=leg_length))
    wedge_stock = Stock.board(thickness=24, species="oak")
    wedge = asm.add(Board("wedge", wedge_stock, length=20, width=kerf + 2 * flare))
    asm.join(
        WedgedRoundMortiseTenon(
            tenon=leg.right_end, mortise=seat.bottom_face, diameter=diameter, wedge=wedge, kerf=kerf
        )
    )
    return asm