Bow saw frame¶

from woodwright.examples import projects

design = projects.bow_saw_frame(arm_length=437.5)

arm        350 x 40 x 22 mm  oak, 2 pieces: left_arm, right_arm
           - mortise 20 x 8 mm, 27 deep, in back_edge
stretcher  550 x 30 x 22 mm  oak
           - tenon 20 x 8 mm, 25 long, on left_end
           - tenon 20 x 8 mm, 25 long, on right_end

def bow_saw_frame(
    arm_length: float = 350,
    arm_width: float = 40,
    stretcher_length: float = 500,
    stretcher_width: float = 30,
    stock: Stock = BOW_SAW_STOCK,
) -> Assembly:
    """The frame of a bow saw: two arms and a stretcher between their middles,
    tenoned into their inner edges.

    The blade (at the bottom) and the string (at the top) aren't modelled.
    """
    asm = Assembly("bow_saw_frame", root_location=STANDING)
    left = asm.add(Board("left_arm", stock, length=arm_length, width=arm_width))
    right = asm.add(Board("right_arm", stock, length=arm_length, width=arm_width))
    stretcher = asm.add(Board("stretcher", stock, length=stretcher_length, width=stretcher_width))
    # The arms face each other with their back and front edges.
    for tenon, mortise in [
        (stretcher.left_end, left.back_edge),
        (stretcher.right_end, right.front_edge),
    ]:
        asm.join(MortiseTenon(tenon=tenon, mortise=mortise, tenon_length=25))
    return asm