nhf/__init__.py

@@ -0,0 +1 @@
+from nhf.materials import Material

nhf/materials.py

@@ -0,0 +1,18 @@
+"""
+A catalog of material properties
+"""
+from enum import Enum
+import cadquery as Cq
+
+def _color(name: str, alpha: float) -> Cq.Color:
+    r, g, b, _ = Cq.Color(name).toTuple()
+    return Cq.Color(r, g, b, alpha)
+
+class Material(Enum):
+
+    WOOD_BIRCH = 0.8, _color('bisque', 0.9)
+    PLASTIC_PLA = 0.5, _color('azure3', 0.6)
+
+    def __init__(self, density: float, color: Cq.Color):
+        self.density = density
+        self.color = color

nhf/touhou/houjuu_nue/__init__.py

@@ -2,6 +2,7 @@ from dataclasses import dataclass
 import unittest
 import cadquery as Cq
 import nhf.joints
+from nhf import Material
 
 @dataclass(frozen=True)
 class Parameters:
@@ -11,8 +12,39 @@ class Parameters:
     """
     panel_thickness: float = 25.4 / 16
 
+    # Harness
+    harness_thickness: float = 25.4 / 8
+    harness_width = 300
+    harness_height = 400
+    harness_fillet = 10
+
+    harness_wing_base_pos = [
+        ("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_wing_base_hole_diam = 6
+
     # Wing root properties
     """
+    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 = 5
+    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_inset = 15
+    """
     Radius of the mounting mechanism of the wing root. This is constrained by
     the size of the harness.
     """
@@ -26,26 +58,77 @@ class Parameters:
     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 harness_profile(self) -> Cq.Sketch:
+        """
+        Creates the harness shape
+        """
+        w, h = self.harness_width / 2, self.harness_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.harness_fillet)
+        )
+        for tag, x, y in self.harness_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_wing_base_hole_diam / 2, mode='s')
+                .reset()
+            )
+        return sketch
+
+    def harness(self) -> Cq.Shape:
+        """
+        Creates the harness shape
+        """
+        result = (
+            Cq.Workplane('XZ')
+            .placeSketch(self.harness_profile())
+            .extrude(self.harness_thickness)
+        )
+        result.faces(">Y").tag("mount")
+        plane = result.faces(">Y").workplane()
+        for tag, x, y in self.harness_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)
+                    .circle(1, forConstruction='True')
+                    .edges()
+                    .tag(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
@@ -56,7 +139,6 @@ class Parameters:
             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")
@@ -69,6 +151,7 @@ class Parameters:
             .hole(5)
             .val()
         )
+        conn = self.hs_joint_harness_conn()
         result = (
             Cq.Workplane('XY')
             .box(
@@ -80,17 +163,29 @@ class Parameters:
             .fillet(self.hs_joint_corner_fillet)
             .faces(">Z")
             .workplane()
-            .rect(hole_rect_width, hole_rect_width, forConstruction=True)
-            .vertices()
+            .pushPoints(conn)
             .cboreHole(
-                diameter=self.hs_joint_corner_diam,
+                diameter=self.harness_to_wing_base_hole_diam,
                 cboreDiameter=self.hs_joint_corner_cbore_diam,
                 cboreDepth=self.hs_joint_corner_cbore_depth)
+        )
+        plane = result.faces(">Z").workplane(offset=-self.hs_joint_base_thickness)
+        for i, (px, py) in enumerate(conn):
+            (
+                plane
+                .moveTo(px, py)
+                .circle(1, forConstruction='True')
+                .edges()
+                .tag(f"h{i}")
+            )
+        result = (
+            result
             .faces(">Z")
             .workplane()
-            .union(hirth.move((0, 0, self.hs_joint_base_thickness)), tol=0.1)
+            .union(hirth.move(Cq.Location((0, 0, self.hs_joint_base_thickness))), tol=0.1)
             .clean()
         )
+        result.faces("<Z").tag("base")
         return result
 
 
@@ -152,3 +247,22 @@ class Parameters:
         )
         return result
 
+    def harness_assembly(self):
+        harness = self.harness()
+        result = (
+            Cq.Assembly()
+            .add(harness, name="harness", color=Material.WOOD_BIRCH.color)
+            .constrain("harness", "Fixed")
+        )
+        for name in ["l1", "l2", "l3", "r1", "r2", "r3"]:
+            j = self.hs_joint_parent()
+            (
+                result
+                .add(j, name=f"hs_{name}p", color=Material.PLASTIC_PLA.color)
+                #.constrain(f"harness?{name}", f"hs_{name}p?mate", "Point")
+                .constrain("harness?mount", f"hs_{name}p?base", "Axis")
+            )
+            for i in range(4):
+                result.constrain(f"harness?{name}_{i}", f"hs_{name}p?h{i}", "Point")
+        result.solve()
+        return result

nhf/touhou/houjuu_nue/test.py

@@ -9,6 +9,9 @@ class Test(unittest.TestCase):
     def test_wings(self):
         p = M.Parameters()
         p.wing_r1()
+    def test_harness(self):
+        p = M.Parameters()
+        p.harness_assembly()
 
 if __name__ == '__main__':
     unittest.main()