Onbashira dimension update and flanges

nhf/touhou/yasaka_kanako/onbashira.py

@@ -11,12 +11,13 @@ class Onbashira(Model):
 
     n_side: int = 6
     # Dimensions of each side panel
-    side_width: float = 200.0
+    side_width: float = 170.0
 
     # Side panels have different lengths
     side_length1: float = 200.0
     side_length2: float = 350.0
     side_length3: float = 400.0
+    side_length4: float = 400.0
 
     side_thickness: float = 25.4 / 8
 
@@ -31,30 +32,32 @@ class Onbashira(Model):
     # Position of the holes, with (0, 0) being the centre of each side
     angle_joint_bolt_position: list[float] = field(default_factory=lambda: [
         (20, 15),
-        (70, 15),
+        (50, 15),
     ])
+    angle_joint_flange_thickness: float = 7.8
+    angle_joint_flange_radius: float = 40.0
 
     # Dimensions of gun barrels
     barrel_diam: float = 25.4 * 2
     barrel_length: float = 300.0
     # Radius from barrel centre to axis
-    rotation_radius: float = 90.0
+    rotation_radius: float = 75.0
     n_bearing_balls: int = 24
     # Size of ball bearings
     bearing_ball_diam: float = 25.4 * 1/2
     bearing_ball_gap: float = .5
     # Thickness of bearing disks
     bearing_thickness: float = 20.0
-    bearing_track_radius: float = 135.0
+    bearing_track_radius: float = 110.0
     # Gap between the inner and outer bearing disks
     bearing_gap: float = 10.0
     bearing_disk_thickness: float = 25.4 / 8
 
-    rotor_inner_radius: float = 55.0
+    rotor_inner_radius: float = 40.0
 
     rotor_bind_bolt_diam: float = 10.0
-    rotor_bind_radius: float = 110.0
+    rotor_bind_radius: float = 85.0
-    stator_bind_radius: float = 170.0
+    stator_bind_radius: float = 140.0
 
     material_side: Material = Material.WOOD_BIRCH
     material_bearing: Material = Material.PLASTIC_PLA
@@ -253,6 +256,7 @@ class Onbashira(Model):
 
         return result
 
+    @target(name="angle-joint")
     def angle_joint(self) -> Cq.Workplane:
         """
         Angular joint between two side panels. This sits at the intersection of
@@ -358,6 +362,37 @@ class Onbashira(Model):
             result.tagAbsolute(f"holeRSI{i}", locrot * Cq.Location(dri, -x, -py), direction="-X")
         return result
 
+    @target(name="angle-joint-flanged")
+    def angle_joint_flanged(self) -> Cq.Workplane:
+        result = self.angle_joint()
+        th = math.pi / self.n_side
+        r = self.bulk_radius
+        flange = (
+            Cq.Sketch()
+            .push([
+                (r, r * math.tan(th))
+            ])
+            .circle(self.angle_joint_flange_radius)
+            .reset()
+            .regularPolygon(self.side_width_inner, self.n_side, mode="i")
+        )
+        flange = (
+            Cq.Workplane()
+            .placeSketch(flange)
+            .extrude(self.angle_joint_flange_thickness)
+            .translate((0, 0, -self.angle_joint_flange_thickness/2))
+        )
+        ri = self.stator_bind_radius
+        h = self.angle_joint_flange_thickness
+        cyl = Cq.Solid.makeCylinder(
+            radius=self.rotor_bind_bolt_diam/2,
+            height=h,
+            pnt=(ri * math.cos(th), ri * math.sin(th), -h/2),
+        )
+        result = result + flange - cyl
+        result.tagAbsolute("holeStatorL", (ri * math.cos(th), ri * math.sin(th), h/2), direction="+Z")
+        result.tagAbsolute("holeStatorR", (ri * math.cos(th), ri * math.sin(th), -h/2), direction="-Z")
+        return result
 
     def bearing_ball(self) -> Cq.Solid:
         return Cq.Solid.makeSphere(radius=self.bearing_ball_diam/2, angleDegrees1=-90)
@@ -427,9 +462,9 @@ class Onbashira(Model):
                 loc=Cq.Location.rot2d(i*360/self.n_side) * Cq.Location(-r,0,0,90,0,90),
             )
         return a
-    def assembly_ring(self) -> Cq.Assembly:
+    def assembly_ring(self, flanged=False) -> Cq.Assembly:
         a = Cq.Assembly()
-        side = self.angle_joint()
+        side = self.angle_joint_flanged() if flanged else self.angle_joint()
         r = self.bulk_radius
         for i in range(self.n_side):
             a = a.addS(
@@ -450,7 +485,7 @@ class Onbashira(Model):
                 name="section1",
             )
             .add(
-                self.assembly_ring(),
+                self.assembly_ring(flanged=True),
                 name="ring1",
             )
             .add(
@@ -465,10 +500,19 @@ class Onbashira(Model):
                 self.assembly_section(length=self.side_length3, hasFrontHole=True, hasBackHole=True),
                 name="section3",
             )
+            .add(
+                self.assembly_ring(),
+                name="ring3",
+            )
+            .add(
+                self.assembly_section(length=self.side_length4, hasFrontHole=True, hasBackHole=False),
+                name="section4",
+            )
         )
         for (nl, nc, nr) in [
                 ("section1", "ring1", "section2"),
                 ("section2", "ring2", "section3"),
+                ("section3", "ring3", "section4"),
         ]:
             for i in range(self.n_side):
                 j = (i + 1) % self.n_side