Add bolts on rotor
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878d532890
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D5F96287843E8DFB
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@ -25,13 +25,17 @@ class Onbashira(Model):
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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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bearing_height: float = 40.0
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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 = 120.0
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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_bind_bolt_diam: float = 10.0
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rotor_bind_radius: float = 50.0
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stator_bind_radius: float = 150.0
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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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@ -41,8 +45,9 @@ class Onbashira(Model):
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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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assert self.bearing_gap < 0.95 * self.bearing_ball_diam
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assert self.rotor_bind_bolt_diam < self.rotor_bind_radius < self.bearing_track_radius
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assert self.bearing_track_radius < self.stator_bind_radius
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@property
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def angle_side(self) -> float:
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@ -62,6 +67,9 @@ class Onbashira(Model):
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@property
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def bearing_disk_gap(self) -> float:
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"""
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Gap between two bearing disks to touch the bearing balls
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"""
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diag = self.bearing_ball_diam
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dx = self.bearing_gap
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return math.sqrt(diag ** 2 - dx ** 2)
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@ -72,6 +80,12 @@ class Onbashira(Model):
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Cq.Sketch()
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.regularPolygon(self.side_width, self.n_side)
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.circle(self.bearing_track_radius + self.bearing_gap/2, mode="s")
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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 bearing_stator(self) -> Cq.Workplane:
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return (
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@ -81,12 +95,22 @@ class Onbashira(Model):
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)
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@target(name="bearing-rotor", kind=TargetKind.DXF)
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def profile_bearing_rotor(self) -> Cq.Sketch:
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bolt_angle = 180 / self.n_side
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return (
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Cq.Sketch()
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.circle(self.bearing_track_radius - self.bearing_gap/2)
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.regularPolygon(self.rotation_radius, self.n_side)
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.vertices()
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.reset()
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.regularPolygon(
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self.rotation_radius, self.n_side,
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mode="c", tag="corners")
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.vertices(tag="corners")
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.circle(self.barrel_diam/2, mode="s")
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.reset()
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.regularPolygon(
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self.rotor_bind_radius, self.n_side,
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mode="c", tag="bolt", angle=bolt_angle)
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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 bearing_rotor(self) -> Cq.Workplane:
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return (
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@ -96,7 +120,25 @@ class Onbashira(Model):
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)
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@target(name="bearing-gasket", kind=TargetKind.DXF)
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def profile_bearing_gasket(self) -> Cq.Sketch:
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pass
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dr = self.bearing_ball_diam
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eps = 0.05
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return (
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Cq.Sketch()
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.circle(self.bearing_track_radius + dr)
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.circle(self.bearing_track_radius - dr, mode="s")
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.reset()
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.regularPolygon(
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self.bearing_track_radius, self.n_bearing_balls,
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mode="c", tag="corners")
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.vertices(tag="corners")
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.circle(self.bearing_ball_diam/2 * (1+eps), mode="s")
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)
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def bearing_gasket(self) -> Cq.Workplane:
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return (
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Cq.Workplane()
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.placeSketch(self.profile_bearing_gasket())
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.extrude(self.bearing_disk_thickness)
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)
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@target(name="pipe", kind=TargetKind.DXF)
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@ -138,7 +180,7 @@ class Onbashira(Model):
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return Cq.Solid.makeSphere(radius=self.bearing_ball_diam/2, angleDegrees1=-90)
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def assembly_rotor(self) -> Cq.Assembly:
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z_lower = -self.bearing_disk_gap - self.bearing_disk_thickness
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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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.addS(
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@ -169,6 +211,13 @@ class Onbashira(Model):
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role=Role.ROTOR,
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loc=Cq.Location(0, 0, z_lower)
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)
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.addS(
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self.bearing_gasket(),
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name="gasket",
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material=self.material_bearing,
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role=Role.ROTOR,
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loc=Cq.Location(0, 0, -self.bearing_disk_thickness/2)
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)
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)
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for i in range(self.n_bearing_balls):
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ball = self.bearing_ball()
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@ -186,7 +235,7 @@ class Onbashira(Model):
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a = Cq.Assembly()
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side = self.side_panel()
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r = self.bulk_radius
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a = a.add(self.assembly_bearing(), name="bearing")
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a = a.add(self.assembly_rotor(), name="rotor")
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for i in range(self.n_side):
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a = a.addS(
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side,
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