Onbashira dimension update and flanges
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D5F96287843E8DFB
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@ -11,12 +11,13 @@ class Onbashira(Model):
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n_side: int = 6
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# Dimensions of each side panel
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side_width: float = 200.0
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side_width: float = 170.0
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# Side panels have different lengths
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side_length1: float = 200.0
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side_length2: float = 350.0
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side_length3: float = 400.0
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side_length4: float = 400.0
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side_thickness: float = 25.4 / 8
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@ -31,30 +32,32 @@ class Onbashira(Model):
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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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(20, 15),
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(70, 15),
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(50, 15),
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])
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angle_joint_flange_thickness: float = 7.8
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angle_joint_flange_radius: float = 40.0
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# Dimensions of gun barrels
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barrel_diam: float = 25.4 * 2
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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 = 90.0
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rotation_radius: float = 75.0
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n_bearing_balls: int = 24
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# Size of ball bearings
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bearing_ball_diam: float = 25.4 * 1/2
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bearing_ball_gap: float = .5
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# Thickness of bearing disks
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bearing_thickness: float = 20.0
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bearing_track_radius: float = 135.0
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bearing_track_radius: float = 110.0
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# Gap between the inner and outer bearing disks
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bearing_gap: float = 10.0
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bearing_disk_thickness: float = 25.4 / 8
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rotor_inner_radius: float = 55.0
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rotor_inner_radius: float = 40.0
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rotor_bind_bolt_diam: float = 10.0
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rotor_bind_radius: float = 110.0
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stator_bind_radius: float = 170.0
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rotor_bind_radius: float = 85.0
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stator_bind_radius: float = 140.0
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material_side: Material = Material.WOOD_BIRCH
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material_bearing: Material = Material.PLASTIC_PLA
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@ -253,6 +256,7 @@ class Onbashira(Model):
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return result
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@target(name="angle-joint")
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def angle_joint(self) -> Cq.Workplane:
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"""
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Angular joint between two side panels. This sits at the intersection of
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@ -358,6 +362,37 @@ class Onbashira(Model):
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result.tagAbsolute(f"holeRSI{i}", locrot * Cq.Location(dri, -x, -py), direction="-X")
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return result
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@target(name="angle-joint-flanged")
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def angle_joint_flanged(self) -> Cq.Workplane:
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result = self.angle_joint()
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th = math.pi / self.n_side
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r = self.bulk_radius
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flange = (
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Cq.Sketch()
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.push([
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(r, r * math.tan(th))
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])
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.circle(self.angle_joint_flange_radius)
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.reset()
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.regularPolygon(self.side_width_inner, self.n_side, mode="i")
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)
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flange = (
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Cq.Workplane()
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.placeSketch(flange)
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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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)
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ri = self.stator_bind_radius
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h = self.angle_joint_flange_thickness
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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), -h/2),
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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), h/2), direction="+Z")
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result.tagAbsolute("holeStatorR", (ri * math.cos(th), ri * math.sin(th), -h/2), direction="-Z")
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return result
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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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@ -427,9 +462,9 @@ class Onbashira(Model):
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loc=Cq.Location.rot2d(i*360/self.n_side) * Cq.Location(-r,0,0,90,0,90),
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)
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return a
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def assembly_ring(self) -> Cq.Assembly:
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def assembly_ring(self, flanged=False) -> Cq.Assembly:
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a = Cq.Assembly()
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side = self.angle_joint()
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side = self.angle_joint_flanged() if flanged else self.angle_joint()
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r = self.bulk_radius
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for i in range(self.n_side):
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a = a.addS(
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@ -450,7 +485,7 @@ class Onbashira(Model):
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name="section1",
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)
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.add(
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self.assembly_ring(),
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self.assembly_ring(flanged=True),
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name="ring1",
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)
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.add(
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@ -465,10 +500,19 @@ class Onbashira(Model):
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self.assembly_section(length=self.side_length3, hasFrontHole=True, hasBackHole=True),
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name="section3",
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)
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.add(
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self.assembly_ring(),
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name="ring3",
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)
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.add(
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self.assembly_section(length=self.side_length4, hasFrontHole=True, hasBackHole=False),
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name="section4",
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)
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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", "ring3", "section4"),
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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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