Onbashira rotor-stator mechanism
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@ -25,6 +25,9 @@ class Role(Flag):
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PARENT = auto()
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CHILD = auto()
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CASING = auto()
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STATOR = auto()
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ROTOR = auto()
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BEARING = auto()
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# Springs, cushions
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DAMPING = auto()
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# Main structural support
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@ -59,6 +62,9 @@ ROLE_COLOR_MAP = {
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Role.PARENT: _color('blue4', 0.6),
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Role.CASING: _color('dodgerblue3', 0.6),
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Role.CHILD: _color('darkorange2', 0.6),
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Role.STATOR: _color('gray', 0.5),
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Role.ROTOR: _color('blue3', 0.5),
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Role.BEARING: _color('green3', 0.8),
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Role.DAMPING: _color('springgreen', 1.0),
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Role.STRUCTURE: _color('gray', 0.4),
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Role.DECORATION: _color('lightseagreen', 0.4),
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@ -16,11 +16,27 @@ class Onbashira(Model):
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side_thickness: float = 25.4 / 8
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# Dimensions of gun barrels
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barrel_diam: float = 45.0
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barrel_length: float = 300.0
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# Radius from barrel centre to axis
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rotation_radius: float = 75.0
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# Radius of ball bearings
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bearing_ball_diam: float = 30.0
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bearing_ball_gap: float = 1.0
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bearing_height: float = 40.0
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bearing_thickness: float = 20.0
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material_side: Material = Material.WOOD_BIRCH
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material_bearing: Material = Material.PLASTIC_PLA
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material_bearing_ball: Material = Material.ACRYLIC_TRANSPARENT
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material_brace: Material = Material.ALUMINUM
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def __post_init__(self):
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assert self.n_side >= 3
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# Bulk must be large enough for the barrel + bearing to rotate
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assert self.bulk_radius - self.side_thickness - self.bearing_thickness - self.bearing_diam > self.rotation_radius + self.barrel_diam / 2
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assert self.bearing_height > self.bearing_diam
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@property
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def angle_side(self) -> float:
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@ -29,11 +45,17 @@ class Onbashira(Model):
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def angle_dihedral(self) -> float:
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return 180 - self.angle_side
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@property
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def barrel_radius(self) -> float:
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def bulk_radius(self) -> float:
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"""
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Calculate radius of the barrel to the centre
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Calculate radius of the bulk to the centre
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"""
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return self.side_width / 2 / math.tan(math.radians(self.angle_side / 2))
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@property
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def bearing_diam(self) -> float:
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return self.bearing_ball_diam + self.bearing_ball_gap
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@property
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def bearing_radius(self) -> float:
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return self.bulk_radius - self.side_thickness - self.bearing_thickness - self.bearing_diam / 2
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@target(name="side-panel", kind=TargetKind.DXF)
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def profile_side_panel(self) -> Cq.Sketch:
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@ -55,7 +77,7 @@ class Onbashira(Model):
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.polyline([
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(-w/2, 0),
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(w/2, 0),
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(0, self.barrel_radius),
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(0, self.bulk_radius),
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])
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.close()
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.extrude(l)
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@ -64,10 +86,100 @@ class Onbashira(Model):
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# Intersect the side panel
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return result * intersector
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def bearing_channel(self) -> Cq.Solid:
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"""
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Generates a toroidal channel for the ball bearings
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"""
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return Cq.Solid.makeTorus(
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radius1=self.bearing_radius,
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radius2=self.bearing_diam/2,
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)
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@target(name="inner-rotor")
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def inner_rotor(self) -> Cq.Workplane:
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r_outer = self.bearing_radius
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base = Cq.Solid.makeCylinder(
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radius=r_outer,
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height=self.bearing_height
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).translate(Cq.Vector(0,0,-self.bearing_height/2))
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r_rot = self.rotation_radius
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channel = self.bearing_channel()
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return (
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Cq.Workplane()
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.add(base - channel)
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.faces(">Z")
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.workplane()
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.polygon(
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nSides=self.n_side,
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diameter=2 * r_rot,
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forConstruction=True
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)
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.vertices()
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.hole(self.barrel_diam)
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)
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return base - channel
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@target(name="outer-rotor")
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def outer_rotor(self) -> Cq.Workplane:
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polygon_radius = (self.bulk_radius - self.side_thickness) / math.cos(math.radians(self.angle_side / 2))
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profile = (
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Cq.Sketch()
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.regularPolygon(
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r=polygon_radius,
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n=self.n_side,
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)
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)
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inner = Cq.Solid.makeCylinder(
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radius=self.bearing_radius,
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height=self.bearing_height,
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)
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base = (
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Cq.Workplane()
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.placeSketch(profile)
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.extrude(self.bearing_height)
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.cut(inner)
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.translate(Cq.Vector(0,0,-self.bearing_height/2))
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.cut(self.bearing_channel())
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)
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r = self.bearing_radius * 2
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subtractor = Cq.Solid.makeBox(
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length=r * 2,
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width=r * 2,
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height=self.bearing_height,
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).translate(Cq.Vector(-r, -r, -self.bearing_height))
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return base - subtractor
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def bearing_ball(self) -> Cq.Solid:
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return Cq.Solid.makeSphere(radius=self.bearing_ball_diam/2, angleDegrees1=-90)
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def assembly_bearing(self) -> Cq.Assembly:
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a = (
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Cq.Assembly()
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.addS(
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self.inner_rotor(),
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name="inner",
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material=self.material_bearing,
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role=Role.ROTOR,
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)
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.addS(
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self.outer_rotor(),
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name="outer",
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material=self.material_bearing,
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role=Role.STATOR,
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)
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)
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for i in range(self.n_side):
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ball = self.bearing_ball()
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a = a.addS(
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ball,
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name=f"bearing_ball{i}",
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material=self.material_bearing_ball,
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role=Role.BEARING,
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loc=Cq.Location.rot2d(i * 360/self.n_side) * Cq.Location(self.bearing_radius, 0, 0),
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)
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return a
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def assembly(self) -> Cq.Assembly:
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a = Cq.Assembly()
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side = self.side_panel()
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r = self.barrel_radius
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r = self.bulk_radius
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for i in range(6):
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a = a.addS(
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side,
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