Eliminate difficult geometry in angle joint
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40c32213e1
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D5F96287843E8DFB
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@ -90,6 +90,7 @@ class Material(Enum):
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ACRYLIC_TRANSLUSCENT = 1.18, _color('ivory2', 0.8)
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ACRYLIC_TRANSPARENT = 1.18, _color('ghostwhite', 0.5)
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STEEL_SPRING = 7.8, _color('gray', 0.8)
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STEEL_STAINLESS = 7.8, _color('gray', 0.9)
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METAL_AL = 2.7, _color('gray', 0.6)
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METAL_BRASS = 8.5, _color('gold1', 0.8)
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@ -68,21 +68,22 @@ class Onbashira(Model):
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section1_gohei_loc: float = 30.0
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gohei_bolt_diam: float = 6.0
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# Joints between two sets of side panels
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# The angle joint bridges between two sets of side panels.
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# Extra thickness beyond the onbashira's body
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angle_joint_thickness: float = 10.0
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# Z-axis size of each angle joint
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angle_joint_depth: float = 50.0
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# Gap of each angle joint to connect the outside to the inside
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angle_joint_gap: float = 8.0
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angle_joint_bolt_length: float = 50.0
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angle_joint_bolt_diam: float = 6.0
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angle_joint_bolt_diam: float = BOLT_COMMON.diam_thread
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angle_joint_bolt_head_diam: float = 13.0
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angle_joint_bolt_head_depth: float = 3.0
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# Position of the holes, with (0, 0) being the centre of each side
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angle_joint_bolt_position: list[float] = field(default_factory=lambda: [
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(40, 10),
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])
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angle_joint_flange_thickness: float = 7.8
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angle_joint_flange_radius: float = 23.0
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angle_joint_conn_thickness: float = 4.0
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angle_joint_conn_depth: float = 15.0
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@ -110,7 +111,7 @@ class Onbashira(Model):
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bearing_disk_thickness: float = 25.4 / 8
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rotor_inner_radius: float = 40.0
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rotor_bind_bolt_diam: float = 6.0
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rotor_bind_bolt_diam: float = BOLT_COMMON.diam_thread
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rotor_bind_radius: float = 78.0
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rotor_spacer_outer_diam: float = 15.0
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stator_bind_radius: float = 135.0
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@ -126,6 +127,7 @@ class Onbashira(Model):
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material_bearing_ball: Material = Material.ACRYLIC_TRANSPARENT
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material_barrel: Material = Material.ACRYLIC_BLACK
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material_brace: Material = Material.PLASTIC_PLA
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material_fastener: Material = Material.STEEL_STAINLESS
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def __post_init__(self):
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assert self.n_side >= 3
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@ -320,6 +322,9 @@ class Onbashira(Model):
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return outer - inner
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def assembly_barrel(self) -> Cq.Assembly:
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"""
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The assembly with gun barrels
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"""
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z_lower = -self.bearing_disk_gap/2 - self.bearing_disk_thickness
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a = (
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Cq.Assembly()
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@ -611,6 +616,34 @@ class Onbashira(Model):
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return result
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@target(name="chamber-back", kind=TargetKind.DXF)
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def profile_chamber_back(self) -> Cq.Sketch:
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return (
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Cq.Sketch()
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.regularPolygon(self.side_width - self.side_thickness, self.n_side)
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.reset()
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.regularPolygon(
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self.stator_bind_radius, self.n_side,
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mode="c", tag="bolt")
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.vertices(tag="bolt")
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.circle(self.rotor_bind_bolt_diam/2, mode="s")
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)
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def chamber_back(self) -> Cq.Workplane:
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sketch = self.profile_chamber_back()
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result = (
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Cq.Workplane()
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.placeSketch(sketch)
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.extrude(self.side_thickness)
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)
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# Mark all attachment points
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for i in range(self.n_side):
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angle = (i+0.5) * math.radians(360 / self.n_side)
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x = self.stator_bind_radius * math.cos(angle)
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y = self.stator_bind_radius * math.sin(angle)
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result.tagAbsolute(f"holeF{i}", (x, y, self.side_thickness), direction="+Z")
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result.tagAbsolute(f"holeB{i}", (x, -y, 0), direction="-Z")
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return result
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def assembly_chamber(self) -> Cq.Assembly:
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a = Cq.Assembly()
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side = self.chamber_side_panel()
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@ -761,11 +794,11 @@ class Onbashira(Model):
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.reset()
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.regularPolygon(self.side_width_inner, self.n_side, mode="i")
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.finalize()
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.extrude(self.angle_joint_flange_thickness)
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.translate((0, 0, -self.angle_joint_flange_thickness/2))
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.extrude(self.angle_joint_gap)
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.translate((0, 0, -self.angle_joint_gap/2))
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)
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ri = self.stator_bind_radius
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h = self.angle_joint_flange_thickness
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h = self.angle_joint_gap
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cyl = Cq.Solid.makeCylinder(
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radius=self.rotor_bind_bolt_diam/2,
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height=h,
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@ -899,19 +932,19 @@ class Onbashira(Model):
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.reset()
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.regularPolygon(self.side_width_inner, self.n_side, mode="i")
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.finalize()
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.extrude(self.angle_joint_flange_thickness)
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.extrude(self.angle_joint_gap)
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.translate((0, 0, -flange_z))
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)
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ri = self.stator_bind_radius
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h = self.angle_joint_flange_thickness
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h = self.angle_joint_gap
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cyl = Cq.Solid.makeCylinder(
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radius=self.rotor_bind_bolt_diam/2,
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height=h,
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pnt=(ri * math.cos(th), ri * math.sin(th), -flange_z),
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)
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result = result + flange - cyl
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result.tagAbsolute("holeStatorL", (ri * math.cos(th), ri * math.sin(th), -flange_z+h/2), direction="+Z")
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result.tagAbsolute("holeStatorR", (ri * math.cos(th), ri * math.sin(th), -flange_z-h/2), direction="-Z")
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result.tagAbsolute("holeStatorO", (ri * math.cos(th), ri * math.sin(th), -flange_z), direction="-Z")
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result.tagAbsolute("holeStatorI", (ri * math.cos(th), ri * math.sin(th), -flange_z+h), direction="+Z")
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return result
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@target(name="angle-joint")
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@ -1044,11 +1077,11 @@ class Onbashira(Model):
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.reset()
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.regularPolygon(self.side_width_inner, self.n_side, mode="i")
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.finalize()
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.extrude(self.angle_joint_flange_thickness)
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.translate((0, 0, -self.angle_joint_flange_thickness/2))
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.extrude(self.angle_joint_gap)
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.translate((0, 0, -self.angle_joint_gap/2))
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)
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ri = self.stator_bind_radius
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h = self.angle_joint_flange_thickness
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h = self.angle_joint_gap
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cyl = Cq.Solid.makeCylinder(
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radius=self.rotor_bind_bolt_diam/2,
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height=h,
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@ -1135,7 +1168,7 @@ class Onbashira(Model):
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)
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.add(
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self.assembly_ring(self.angle_joint_chamber_front()),
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name="chamber_front",
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name="ring3",
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)
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.add(
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self.assembly_chamber(),
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@ -1143,32 +1176,52 @@ class Onbashira(Model):
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)
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.add(
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self.assembly_ring(self.angle_joint_chamber_back()),
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name="chamber_back",
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name="ring4",
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)
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.add(self.assembly_barrel(), name="barrel")
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.addS(
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self.chamber_back(),
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name="chamber_back",
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material=self.material_side,
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role=Role.STRUCTURE | Role.DECORATION,
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)
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#.add(self.assembly_barrel(), name="barrel")
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)
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for i in range(self.n_side):
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j = (i + 1) % self.n_side
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for ih in range(len(self.angle_joint_bolt_position)):
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a = a.constrain(
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f"chamber/side{i}?holeFPI{ih}",
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f"chamber_front/side{i}?holeRSO{ih}",
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f"ring3/side{i}?holeRSO{ih}",
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"Plane",
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)
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a = a.constrain(
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f"chamber/side{i}?holeBPI{ih}",
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f"chamber_back/side{i}?holeLSO{ih}",
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f"ring4/side{i}?holeLSO{ih}",
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"Plane",
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)
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a = a.constrain(
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f"barrel/stator2?holeB{i}",
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f"ring1/side{i}?holeStatorR",
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f"ring4/side{i}?holeStatorO",
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f"chamber_back?holeB{i}",
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"Plane",
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)
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name_bolt =f"chamber_back{i}boltFPI{ih}"
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a = a.addS(
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BOLT_COMMON.generate(),
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name=name_bolt,
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material=self.material_fastener,
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role=Role.CONNECTION,
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)
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a = a.constrain(
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f"chamber_back?holeF{i}",
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f"{name_bolt}?root",
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"Plane",
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param=0,
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)
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for (nl, nc, nr) in [
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("section1", "ring1", "section2"),
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("section2", "ring2", "section3"),
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("section3", "chamber_front", None),
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("section3", "ring3", None),
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]:
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a = a.constrain(
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f"{nl}/side{i}?holeBSO{ih}",
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