cosplay: Touhou/Houjuu Nue #4
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@ -1 +1 @@
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from nhf.materials import Material
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from nhf.materials import Material, Role
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@ -2,6 +2,13 @@ from dataclasses import dataclass
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import math
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import cadquery as Cq
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import nhf.springs as NS
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from nhf import Role
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def hirth_tooth_angle(n_tooth):
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"""
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Angle of one whole tooth
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"""
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return 360 / n_tooth
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def hirth_joint(radius=60,
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radius_inner=40,
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@ -9,9 +16,13 @@ def hirth_joint(radius=60,
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n_tooth=16,
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tooth_height=16,
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tooth_height_inner=2,
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tol=0.01):
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tol=0.01,
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tag_prefix="",
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is_mated=False):
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"""
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Creates a cylindrical Hirth Joint
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is_mated: If set to true, rotate the teeth so they line up at 0 degrees.
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"""
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# ensures secant doesn't blow up
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assert n_tooth >= 5
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@ -51,9 +62,14 @@ def hirth_joint(radius=60,
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.val()
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)
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tooth_centre_radius = radius_inner * math.cos(theta)
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angle_offset = hirth_tooth_angle(n_tooth) / 2 if is_mated else 0
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teeth = (
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Cq.Workplane('XY')
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.polarArray(radius=tooth_centre_radius, startAngle=0, angle=360, count=n_tooth)
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.polarArray(
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radius=tooth_centre_radius,
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startAngle=angle_offset,
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angle=360,
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count=n_tooth)
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.eachpoint(lambda loc: tooth.located(loc))
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.intersect(Cq.Solid.makeCylinder(
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height=base_height + tooth_height,
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@ -66,36 +82,54 @@ def hirth_joint(radius=60,
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height=base_height,
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radius=radius,
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centered=(True, True, False))
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.faces(">Z").tag("bore")
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.faces(">Z").tag(f"{tag_prefix}bore")
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.union(teeth.val().move(Cq.Location((0,0,base_height))), tol=tol)
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.clean()
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)
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#base.workplane(offset=tooth_height/2).circle(radius=radius,forConstruction=True).tag("mate")
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base.polyline([(0, 0, base_height), (0, 0, base_height+tooth_height)], forConstruction=True).tag("mate")
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(
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base
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.polyline([(0, 0, base_height), (0, 0, base_height+tooth_height)], forConstruction=True)
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.tag(f"{tag_prefix}mate")
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)
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(
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base
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.polyline([(0, 0, 0), (1, 0, 0)], forConstruction=True)
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.tag(f"{tag_prefix}directrix")
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)
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return base
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def hirth_assembly():
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def hirth_assembly(n_tooth=12):
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"""
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Example assembly of two Hirth joints
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"""
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rotate = 180 / 16
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obj1 = hirth_joint().faces(tag="bore").cboreHole(
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diameter=10,
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cboreDiameter=20,
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cboreDepth=3)
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obj2 = (
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hirth_joint()
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.rotate(
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axisStartPoint=(0,0,0),
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axisEndPoint=(0,0,1),
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angleDegrees=rotate
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)
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#rotate = 180 / 16
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tab = (
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Cq.Workplane('XY')
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.box(100, 10, 2, centered=False)
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)
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obj1 = (
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hirth_joint(n_tooth=n_tooth)
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.faces(tag="bore")
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.cboreHole(
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diameter=10,
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cboreDiameter=20,
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cboreDepth=3)
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.union(tab)
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)
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obj2 = (
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hirth_joint(n_tooth=n_tooth, is_mated=True)
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.union(tab)
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)
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angle = hirth_tooth_angle(n_tooth)
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result = (
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Cq.Assembly()
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.add(obj1, name="obj1", color=Cq.Color(0.8,0.8,0.5,0.3))
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.add(obj2, name="obj2", color=Cq.Color(0.5,0.5,0.5,0.3))
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.add(obj1, name="obj1", color=Role.PARENT.color)
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.add(obj2, name="obj2", color=Role.CHILD.color)
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.constrain("obj1", "Fixed")
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.constrain("obj1?mate", "obj2?mate", "Plane")
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.constrain("obj1?directrix", "obj2?directrix", "Axis", param=angle)
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.solve()
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)
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return result
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