346 lines
11 KiB
Python
346 lines
11 KiB
Python
"""
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To build, execute
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```
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python3 nhf/touhou/houjuu_nue/__init__.py
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```
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This cosplay consists of 3 components:
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## Trident
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The trident is composed of individual segments, made of acrylic, and a 3D
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printed head (convention rule prohibits metal) with a metallic paint. To ease
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transportation, the trident handle has individual segments with threads and can
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be assembled on site.
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## Snake
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A 3D printed snake with a soft material so it can wrap around and bend
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## Wings
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This is the crux of the cosplay and the most complex component. The wings mount
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on a wearable harness. Each wing consists of 4 segments with 3 joints. Parts of
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the wing which demands transluscency are created from 1/16" acrylic panels.
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These panels serve double duty as the exoskeleton.
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The wings are labeled r1,r2,r3,l1,l2,l3. The segments of the wings are labeled
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from root to tip s0 (root),
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s1, s2, s3. The joints are named (from root to tip)
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shoulder, elbow, wrist in analogy with human anatomy.
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"""
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from dataclasses import dataclass, field
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import unittest
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import cadquery as Cq
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from nhf import Material, Role
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from nhf.build import Model, TargetKind, target
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from nhf.parts.joints import HirthJoint
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from nhf.parts.handle import Handle
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import nhf.touhou.houjuu_nue.wing as MW
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import nhf.touhou.houjuu_nue.trident as MT
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@dataclass
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class Parameters(Model):
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"""
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Defines dimensions for the Houjuu Nue cosplay
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"""
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# Thickness of the exoskeleton panel in millimetres
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panel_thickness: float = 25.4 / 16
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# Harness
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harness_thickness: float = 25.4 / 8
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harness_width: float = 300
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harness_height: float = 400
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harness_fillet: float = 10
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harness_wing_base_pos: list[tuple[str, float, float]] = field(default_factory=lambda: [
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("r1", 70, 150),
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("l1", -70, 150),
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("r2", 100, 0),
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("l2", -100, 0),
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("r3", 70, -150),
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("l3", -70, -150),
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])
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# Holes drilled onto harness for attachment with HS joint
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harness_to_root_conn_diam: float = 6
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hs_hirth_joint: HirthJoint = field(default_factory=lambda: HirthJoint(
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radius=30,
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radius_inner=20,
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tooth_height=10,
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base_height=5
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))
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# Wing root properties
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#
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# The Houjuu-Scarlett joint mechanism at the base of the wing
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hs_joint_base_width: float = 85
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hs_joint_base_thickness: float = 10
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hs_joint_corner_fillet: float = 5
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hs_joint_corner_cbore_diam: float = 12
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hs_joint_corner_cbore_depth: float = 2
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hs_joint_corner_inset: float = 12
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hs_joint_axis_diam: float = 12
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hs_joint_axis_cbore_diam: float = 20
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hs_joint_axis_cbore_depth: float = 3
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# Exterior radius of the wing root assembly
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wing_root_radius: float = 40
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"""
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Heights for various wing joints, where the numbers start from the first joint.
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"""
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wing_r1_height: float = 100
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wing_r1_width: float = 400
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wing_r2_height: float = 100
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wing_r3_height: float = 100
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trident_handle: Handle = field(default_factory=lambda: Handle(
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diam=38,
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diam_inner=38-2 * 25.4/8,
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# M27-3
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diam_threading=27,
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thread_pitch=3,
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diam_connector_internal=18,
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simplify_geometry=False,
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))
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def __post_init__(self):
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super().__init__(name="houjuu-nue")
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assert self.wing_root_radius > self.hs_hirth_joint.radius,\
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"Wing root must be large enough to accomodate joint"
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@target(name="trident/handle-connector")
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def handle_connector(self):
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return self.trident_handle.connector()
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@target(name="trident/handle-insertion")
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def handle_insertion(self):
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return self.trident_handle.insertion()
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def harness_profile(self) -> Cq.Sketch:
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"""
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Creates the harness shape
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"""
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w, h = self.harness_width / 2, self.harness_height / 2
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sketch = (
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Cq.Sketch()
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.polygon([
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(0.7 * w, h),
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(w, 0),
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(0.7 * w, -h),
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(0.7 * -w, -h),
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(-w, 0),
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(0.7 * -w, h),
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])
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#.rect(self.harness_width, self.harness_height)
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.vertices()
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.fillet(self.harness_fillet)
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)
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for tag, x, y in self.harness_wing_base_pos:
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conn = [(px + x, py + y) for px, py in self.hs_joint_harness_conn()]
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sketch = (
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sketch
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.push(conn)
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.tag(tag)
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.circle(self.harness_to_root_conn_diam / 2, mode='s')
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.reset()
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)
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return sketch
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@target(name="harness", kind=TargetKind.DXF)
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def harness(self) -> Cq.Shape:
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"""
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Creates the harness shape
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"""
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result = (
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Cq.Workplane('XZ')
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.placeSketch(self.harness_profile())
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.extrude(self.harness_thickness)
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)
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result.faces(">Y").tag("mount")
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plane = result.faces(">Y").workplane()
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for tag, x, y in self.harness_wing_base_pos:
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conn = [(px + x, py + y) for px, py in self.hs_joint_harness_conn()]
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for i, (px, py) in enumerate(conn):
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(
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plane
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.moveTo(px, py)
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.circle(1, forConstruction='True')
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.edges()
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.tag(f"{tag}_{i}")
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)
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return result
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def hs_joint_harness_conn(self) -> list[tuple[int, int]]:
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"""
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Generates a set of points corresponding to the connectorss
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"""
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dx = self.hs_joint_base_width / 2 - self.hs_joint_corner_inset
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return [
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(dx, dx),
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(dx, -dx),
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(-dx, -dx),
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(-dx, dx),
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]
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@target(name="hs_joint_parent")
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def hs_joint_parent(self):
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"""
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Parent part of the Houjuu-Scarlett joint, which is composed of a Hirth
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coupling, a cylindrical base, and a mounting base.
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"""
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hirth = self.hs_hirth_joint.generate()
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conn = self.hs_joint_harness_conn()
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result = (
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Cq.Workplane('XY')
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.box(
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self.hs_joint_base_width,
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self.hs_joint_base_width,
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self.hs_joint_base_thickness,
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centered=(True, True, False))
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.translate((0, 0, -self.hs_joint_base_thickness))
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.edges("|Z")
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.fillet(self.hs_joint_corner_fillet)
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.faces(">Z")
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.workplane()
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.pushPoints(conn)
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.cboreHole(
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diameter=self.harness_to_root_conn_diam,
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cboreDiameter=self.hs_joint_corner_cbore_diam,
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cboreDepth=self.hs_joint_corner_cbore_depth)
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)
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# Creates a plane parallel to the holes but shifted to the base
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plane = result.faces(">Z").workplane(offset=-self.hs_joint_base_thickness)
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for i, (px, py) in enumerate(conn):
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(
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plane
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.pushPoints([(px, py)])
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.circle(1, forConstruction='True')
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.edges()
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.tag(f"h{i}")
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)
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result = (
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result
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.faces(">Z")
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.workplane()
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.union(hirth, tol=0.1)
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.clean()
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)
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result = (
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result.faces("<Z")
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.workplane()
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.cboreHole(
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diameter=self.hs_joint_axis_diam,
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cboreDiameter=self.hs_joint_axis_cbore_diam,
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cboreDepth=self.hs_joint_axis_cbore_depth,
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)
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.clean()
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)
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result.faces("<Z").tag("base")
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return result
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@target(name="wing_root")
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def wing_root(self) -> Cq.Assembly:
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"""
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Generate the wing root which contains a Hirth joint at its base and a
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rectangular opening on its side, with the necessary interfaces.
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"""
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return MW.wing_root(joint=self.hs_hirth_joint)
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def wing_r1_profile(self) -> Cq.Sketch:
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"""
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Generates the first wing segment profile, with the wing root pointing in
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the positive x axis.
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"""
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# Depression of the wing middle
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bend = 200
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factor = 0.7
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result = (
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Cq.Sketch()
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.segment((0, 0), (0, self.wing_r1_height))
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.spline([
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(0, self.wing_r1_height),
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(0.5 * self.wing_r1_width, self.wing_r1_height - factor * bend),
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(self.wing_r1_width, self.wing_r1_height - bend),
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])
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.segment(
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(self.wing_r1_width, self.wing_r1_height - bend),
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(self.wing_r1_width, -bend),
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)
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.spline([
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(self.wing_r1_width, - bend),
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(0.5 * self.wing_r1_width, - factor * bend),
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(0, 0),
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])
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.assemble()
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)
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return result
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def wing_r1(self) -> Cq.Solid:
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profile = self.wing_r1_profile()
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result = (
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Cq.Workplane("XY")
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.placeSketch(profile)
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.extrude(self.panel_thickness)
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.val()
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)
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return result
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######################
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# Assemblies #
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######################
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def trident_assembly(self):
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return MT.trident_assembly(self.trident_handle)
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def harness_assembly(self):
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harness = self.harness()
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result = (
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Cq.Assembly()
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.add(harness, name="base", color=Material.WOOD_BIRCH.color)
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.constrain("base", "Fixed")
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)
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for name in ["l1", "l2", "l3", "r1", "r2", "r3"]:
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j = self.hs_joint_parent()
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(
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result
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.add(j, name=name, color=Role.PARENT.color)
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.constrain("base?mount", f"{name}?base", "Axis")
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)
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for i in range(4):
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result.constrain(f"base?{name}_{i}", f"{name}?h{i}", "Point")
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result.solve()
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return result
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def wings_assembly(self):
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"""
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Assembly of harness with all the wings
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"""
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a_tooth = self.hs_hirth_joint.tooth_angle
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result = (
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Cq.Assembly()
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.add(self.harness_assembly(), name="harness", loc=Cq.Location((0, 0, 0)))
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.add(self.wing_root(), name="w0_r1")
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.add(self.wing_root(), name="w0_l1")
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.constrain("harness/base", "Fixed")
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.constrain("w0_r1/joint?mate", "harness/r1?mate", "Plane")
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.constrain("w0_r1/joint?directrix", "harness/r1?directrix",
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"Axis", param=7 * a_tooth)
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.constrain("w0_l1/joint?mate", "harness/l1?mate", "Plane")
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.constrain("w0_l1/joint?directrix", "harness/l1?directrix",
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"Axis", param=-1 * a_tooth)
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.solve()
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)
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return result
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if __name__ == '__main__':
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p = Parameters()
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p.build_all()
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