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New Eiki crown design using conformal mapping

This commit is contained in:
Leni Aniva 2025-02-23 22:01:45 -08:00
parent 89283efd59
commit 396dd997e0
Signed by: aniva
GPG Key ID: 4D9B1C8D10EA4C50
1 changed files with 50 additions and 0 deletions
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50
nhf/touhou/shiki_eiki/crown.py
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@ -357,6 +357,10 @@ class Crown(Model):
return sketch.assemble() return sketch.assemble()
def side_guard(self) -> Cq.Workplane: def side_guard(self) -> Cq.Workplane:
"""
Constructs the side guard using a cone. Via Gauss's Theorema Egregium,
the surface of the cone can be deformed into a plane.
"""
angle = 360 / 5 angle = 360 / 5
outer = Cq.Solid.makeCone( outer = Cq.Solid.makeCone(
radius1=self.radius_lower + self.side_guard_thickness, radius1=self.radius_lower + self.side_guard_thickness,
@ -399,7 +403,48 @@ class Crown(Model):
) )
return shell * profile - channel return shell * profile - channel
def front_surrogate(self) -> Cq.Workplane:
"""
Create a surrogate cylindrical section structure for the front since we
cannot bend extrusions
"""
angle = 360 / 5
outer = Cq.Solid.makeCone(
radius1=self.radius_lower + self.thickness,
radius2=self.radius_upper + self.thickness,
height=self.height,
angleDegrees=angle,
)
inner = Cq.Solid.makeCone(
radius1=self.radius_lower,
radius2=self.radius_upper,
height=self.height,
angleDegrees=angle,
)
shell = (
outer.cut(inner)
.rotate((0,0,0), (0,0,1), -angle/2)
)
dx = math.sin(math.radians(angle / 2)) * self.radius_middle
profile = (
Cq.Workplane('YZ')
.polyline([
(0, self.height),
(-dx, self.height / 2),
(-dx, 0),
(dx, 0),
(dx, self.height / 2),
])
.close()
.extrude(self.radius_upper + self.side_guard_thickness)
.val()
)
return shell * profile
def assembly(self) -> Cq.Assembly: def assembly(self) -> Cq.Assembly:
"""
New assembly using conformal mapping on the cone.
"""
side_guard = self.side_guard() side_guard = self.side_guard()
a = Cq.Assembly() a = Cq.Assembly()
for i in range(1,5): for i in range(1,5):
@ -409,6 +454,11 @@ class Crown(Model):
material=self.material_side, material=self.material_side,
loc=Cq.Location(rz=i*360/5) loc=Cq.Location(rz=i*360/5)
) )
a.addS(
self.front_surrogate(),
name="front",
material=self.material,
)
return a return a
def old_assembly(self) -> Cq.Assembly: def old_assembly(self) -> Cq.Assembly: