Cosplay/nhf/touhou/houjuu_nue/harness.py

from dataclasses import dataclass, field
import cadquery as Cq
from nhf.parts.joints import HirthJoint
from nhf import Material, Role
import nhf.utils

@dataclass
class Harness:
    thickness: float = 25.4 / 8
    width: float = 300.0
    height: float = 400.0
    fillet: float = 10.0

    wing_base_pos: list[tuple[str, float, float]] = field(default_factory=lambda: [
        ("r1", 70, 150),
        ("l1", -70, 150),
        ("r2", 100, 0),
        ("l2", -100, 0),
        ("r3", 70, -150),
        ("l3", -70, -150),
    ])
    # Holes drilled onto harness for attachment with HS joint
    harness_to_root_conn_diam: float = 6

    hs_hirth_joint: HirthJoint = field(default_factory=lambda: HirthJoint(
        radius=30,
        radius_inner=20,
        tooth_height=10,
        base_height=5
    ))

    hs_joint_base_width: float = 85
    hs_joint_base_thickness: float = 10
    hs_joint_corner_fillet: float = 5
    hs_joint_corner_cbore_diam: float = 12
    hs_joint_corner_cbore_depth: float = 2
    hs_joint_corner_inset: float = 12

    hs_joint_axis_diam: float = 12
    hs_joint_axis_cbore_diam: float = 20
    hs_joint_axis_cbore_depth: float = 3

    def profile(self) -> Cq.Sketch:
        """
        Creates the harness shape
        """
        w, h = self.width / 2, self.height / 2
        sketch = (
            Cq.Sketch()
            .polygon([
                (0.7 * w, h),
                (w, 0),
                (0.7 * w, -h),
                (0.7 * -w, -h),
                (-w, 0),
                (0.7 * -w, h),
            ])
            #.rect(self.harness_width, self.harness_height)
            .vertices()
            .fillet(self.fillet)
        )
        for tag, x, y in self.wing_base_pos:
            conn = [(px + x, py + y) for px, py in self.hs_joint_harness_conn()]
            sketch = (
                sketch
                .push(conn)
                .tag(tag)
                .circle(self.harness_to_root_conn_diam / 2, mode='s')
                .reset()
            )
        return sketch

    def surface(self) -> Cq.Workplane:
        """
        Creates the harness shape
        """
        result = (
            Cq.Workplane('XZ')
            .placeSketch(self.profile())
            .extrude(self.thickness)
        )
        result.faces(">Y").tag("mount")
        plane = result.faces(">Y").workplane()
        for tag, x, y in self.wing_base_pos:
            conn = [(px + x, py + y) for px, py
                    in self.hs_joint_harness_conn()]
            for i, (px, py) in enumerate(conn):
                plane.moveTo(px, py).tagPoint(f"{tag}_{i}")
        return result

    def hs_joint_harness_conn(self) -> list[tuple[int, int]]:
        """
        Generates a set of points corresponding to the connectorss
        """
        dx = self.hs_joint_base_width / 2 - self.hs_joint_corner_inset
        return [
            (dx, dx),
            (dx, -dx),
            (-dx, -dx),
            (-dx, dx),
        ]

    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 = self.hs_hirth_joint.generate()
        conn = self.hs_joint_harness_conn()
        result = (
            Cq.Workplane('XY')
            .box(
                self.hs_joint_base_width,
                self.hs_joint_base_width,
                self.hs_joint_base_thickness,
                centered=(True, True, False))
            .translate((0, 0, -self.hs_joint_base_thickness))
            .edges("|Z")
            .fillet(self.hs_joint_corner_fillet)
            .faces(">Z")
            .workplane()
            .pushPoints(conn)
            .cboreHole(
                diameter=self.harness_to_root_conn_diam,
                cboreDiameter=self.hs_joint_corner_cbore_diam,
                cboreDepth=self.hs_joint_corner_cbore_depth)
        )
        # Creates a plane parallel to the holes but shifted to the base
        plane = result.faces(">Z").workplane(offset=-self.hs_joint_base_thickness)

        for i, (px, py) in enumerate(conn):
            plane.moveTo(px, py).tagPoint(f"h{i}")
        result = (
            result
            .faces(">Z")
            .workplane()
            .union(hirth, tol=0.1)
            .clean()
        )
        result = (
            result.faces("<Z")
            .workplane()
            .cboreHole(
                diameter=self.hs_joint_axis_diam,
                cboreDiameter=self.hs_joint_axis_cbore_diam,
                cboreDepth=self.hs_joint_axis_cbore_depth,
            )
            .clean()
        )
        result.faces("<Z").tag("base")
        return result

    def assembly(self) -> Cq.Assembly:
        harness = self.surface()
        result = (
            Cq.Assembly()
            .add(harness, name="base", color=Material.WOOD_BIRCH.color)
            .constrain("base", "Fixed")
        )
        for name in ["l1", "l2", "l3", "r1", "r2", "r3"]:
            j = self.hs_joint_parent()
            (
                result
                .add(j, name=name, color=Role.PARENT.color)
                #.constrain("base?mount", f"{name}?base", "Axis")
            )
            for i in range(4):
                result.constrain(f"base?{name}_{i}", f"{name}?h{i}", "Point")
        result.solve()
        return result