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Side guard attachment dovetail

This commit is contained in:
Leni Aniva 2025-03-03 00:13:41 -08:00
parent 396dd997e0
commit e1893d139f
Signed by: aniva
GPG Key ID: 4D9B1C8D10EA4C50
1 changed files with 40 additions and 7 deletions
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47
nhf/touhou/shiki_eiki/crown.py
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@ -22,6 +22,8 @@ class Crown(Model):
side_guard_thickness: float = 15.0
side_guard_channel_radius: float = 90
side_guard_channel_height: float = 10
side_guard_hole_height: float = 15.0
side_guard_hole_diam: float = 1.5
material: Material = Material.METAL_BRASS
material_side: Material = Material.PLASTIC_PLA
@ -356,7 +358,24 @@ class Crown(Model):
)
return sketch.assemble()
def side_guard(self) -> Cq.Workplane:
def side_guard_dovetail(self) -> Cq.Solid:
"""
Generates a dovetail coupling for the side guard
"""
dx = self.side_guard_thickness / 2
wire = Cq.Wire.makePolygon([
(dx * 0.5, 0),
(dx * 0.8, dx),
(-dx * 0.8, dx),
(-dx * 0.5, 0),
], close=True)
return Cq.Solid.extrudeLinear(
wire,
[],
(0,0,self.height/3),
)
def side_guard(self, attach_left: bool = True, attach_right: bool = False) -> 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.
@ -374,11 +393,8 @@ class Crown(Model):
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
shell = (outer - inner).rotate((0,0,0), (0,0,1), -angle/2)
dx = math.sin(math.radians(angle / 2)) * (self.radius_middle + self.side_guard_thickness)
profile = (
Cq.Workplane('YZ')
.polyline([
@ -401,7 +417,24 @@ class Crown(Model):
height=self.side_guard_channel_height,
)
)
return shell * profile - channel
result = shell * profile - channel
for i in [-2, -1, 0, 1, 2]:
phi = i * (math.pi / 14)
hole = Cq.Solid.makeCylinder(
radius=self.side_guard_hole_diam / 2,
height=self.radius_upper * 2,
pnt=(0, 0, self.side_guard_hole_height),
dir=(math.cos(phi), math.sin(phi), 0),
)
result = result - hole
radius_attach = self.radius_lower + self.side_guard_thickness / 2
# tilt the dovetail by radius differential
angle_tilt = math.degrees(math.atan2(self.radius_middle - self.radius_lower, self.height / 2))
print(angle_tilt)
dovetail = self.side_guard_dovetail()
loc_dovetail = Cq.Location.rot2d(angle / 2) * Cq.Location(radius_attach, 0, 0, 0, angle_tilt, 0) * Cq.Location.rot2d(180)
return result - dovetail.moved(loc_dovetail)
def front_surrogate(self) -> Cq.Workplane:
"""