Cosplay/nhf/touhou/houjuu_nue/__init__.py

from dataclasses import dataclass
import unittest
import cadquery as Cq
import nhf.joints

@dataclass(frozen=True)
class Parameters:

    """
    Thickness of the exoskeleton panel in millimetres
    """
    panel_thickness: float = 25.4 / 16

    # Wing root properties
    """
    Radius of the mounting mechanism of the wing root. This is constrained by
    the size of the harness.
    """
    root_radius: float = 60

    """
    Heights for various wing joints, where the numbers start from the first joint.
    """
    wing_r1_height = 100
    wing_r1_width = 400
    wing_r2_height = 100
    wing_r3_height = 100

    """
    The Houjuu-Scarlett joint mechanism at the base of the wing
    """
    hs_joint_base_width = 85
    hs_joint_base_thickness = 10
    hs_joint_ring_thickness = 10
    hs_joint_tooth_height = 10
    hs_joint_radius = 30
    hs_joint_radius_inner = 20
    hs_joint_corner_fillet = 5
    hs_joint_corner_cbore_diam = 12
    hs_joint_corner_cbore_depth = 12
    hs_joint_corner_diam = 15
    hs_joint_corner_inset = 15

    def print_geometries(self):
        return [
            self.hs_joint_parent()
        ]

    def hs_joint_parent(self):
        """
        Parent part of the Houjuu-Scarlett joint, which is composed of a Hirth
        coupling, a cylindrical base, and a mounting base.
        """
        hirth = nhf.joints.hirth_joint(
            radius=self.hs_joint_radius,
            radius_inner=self.hs_joint_radius_inner,
            tooth_height=self.hs_joint_tooth_height,
            base_height=self.hs_joint_ring_thickness)
        hole_rect_width = self.hs_joint_base_width - 2 * self.hs_joint_corner_inset
        hirth = (
            hirth
            .faces("<Z")
            .workplane()
            .transformed(
                offset=Cq.Vector(0, 0, -self.hs_joint_ring_thickness / 2),
                rotate=Cq.Vector(90, 0, 0))
            # This hole will drill only to the centre and not through. This is
            # intended.
            .hole(5)
            .val()
        )
        result = (
            Cq.Workplane('XY')
            .box(
                self.hs_joint_base_width,
                self.hs_joint_base_width,
                self.hs_joint_base_thickness,
                centered=(True, True, False))
            .edges("|Z")
            .fillet(self.hs_joint_corner_fillet)
            .faces(">Z")
            .workplane()
            .rect(hole_rect_width, hole_rect_width, forConstruction=True)
            .vertices()
            .cboreHole(
                diameter=self.hs_joint_corner_diam,
                cboreDiameter=self.hs_joint_corner_cbore_diam,
                cboreDepth=self.hs_joint_corner_cbore_depth)
            .faces(">Z")
            .workplane()
            .union(hirth.move((0, 0, self.hs_joint_base_thickness)), tol=0.1)
            .clean()
        )
        return result



    def wing_r1_profile(self) -> Cq.Sketch:
        """
        Generates the first wing segment profile, with the wing root pointing in
        the positive x axis.
        """
        # Depression of the wing middle
        bend = 200
        factor = 0.7
        result = (
            Cq.Sketch()
            .segment((0, 0), (0, self.wing_r1_height))
            .spline([
                (0, self.wing_r1_height),
                (0.5 * self.wing_r1_width, self.wing_r1_height - factor * bend),
                (self.wing_r1_width, self.wing_r1_height - bend),
            ])
            .segment(
                (self.wing_r1_width, self.wing_r1_height - bend),
                (self.wing_r1_width, -bend),
            )
            .spline([
                (self.wing_r1_width, - bend),
                (0.5 * self.wing_r1_width, - factor * bend),
                (0, 0),
            ])
            .assemble()
        )
        return result

    def wing_r1(self) -> Cq.Solid:
        profile = self.wing_r1_profile()
        result = (
            Cq.Workplane("XY")
            .placeSketch(profile)
            .extrude(self.panel_thickness)
            .val()
        )
        return result

    def wing_root(self,
                  side_width=30,
                  side_height=100) -> Cq.Shape:
        """
        Generate the wing root which contains a Hirth joint at its base and a
        rectangular opening on its side, with the necessary interfaces.
        """
        result = (
            Cq.Workplane("XY")
            .circle(self.root_radius)
            .transformed(offset=Cq.Vector(80, 0, 80),
                         rotate=Cq.Vector(0, 45, 0))
            .rect(side_width, side_height)
            .loft()
            .val()
        )
        return result