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Slot-based connectors for crown side guards

This commit is contained in:
Leni Aniva 2025-03-14 01:52:52 -07:00
parent 0991b39d8a
commit eb6343fa32
Signed by: aniva
GPG Key ID: 4D9B1C8D10EA4C50
1 changed files with 107 additions and 20 deletions
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127
nhf/touhou/shiki_eiki/crown.py
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@ -3,6 +3,7 @@ from nhf.build import Model, target, assembly, TargetKind
import nhf.utils
import math
from typing import Optional
from dataclasses import dataclass, field
from enum import Enum
import cadquery as Cq
@ -11,6 +12,8 @@ class AttachPoint(Enum):
DOVETAIL_IN = 1
DOVETAIL_OUT = 2
NONE = 3
# Inset slot for front surface attachment j
SLOT = 4
@dataclass
class Crown(Model):
@ -20,9 +23,15 @@ class Crown(Model):
base_circ: float = 538.0
# Upper circumference, at the middle
tilt_circ: float = 640.0
front_base_circ: float = (640.0 + 538.0) / 2
# Total height
height: float = 120.0
# Front guard has a wing that inserts into the side guards.
front_wing_angle: float = 9.0
front_wing_dh: float = 40.0
front_wing_height: float = 20.0
margin: float = 10.0
thickness: float = 0.4 # 26 Gauge
@ -33,6 +42,13 @@ class Crown(Model):
side_guard_hole_diam: float = 1.5
side_guard_dovetail_height: float = 30.0
side_guard_slot_width: float = 22.0
side_guard_slot_angle: float = 18.0
# brass insert thickness
slot_thickness: float = 2.0
slot_width: float = 20.0
slot_tilt: float = 45
material: Material = Material.METAL_BRASS
material_side: Material = Material.PLASTIC_PLA
@ -43,6 +59,9 @@ class Crown(Model):
assert self.facet_width_upper / 2 > self.height / 2, "Top angle must be > 90 degrees"
assert self.side_guard_channel_radius > self.radius_lower
assert self.front_wing_angle < 180 / self.facets
assert self.front_wing_dh + self.front_wing_height < self.height
@property
def facet_width_lower(self):
return self.base_circ / self.facets
@ -59,6 +78,16 @@ class Crown(Model):
def radius_upper(self):
return (self.tilt_circ + (self.tilt_circ - self.base_circ)) / (2 * math.pi)
@property
def radius_lower_front(self):
return self.front_base_circ / (2 * math.pi)
@property
def radius_middle_front(self):
return self.radius_lower_front + (self.radius_middle - self.radius_lower)
@property
def radius_upper_front(self):
return self.radius_lower_front + (self.radius_upper - self.radius_lower)
def profile_base(self) -> Cq.Sketch:
# Generate the pentagonal shape
@ -383,12 +412,42 @@ class Crown(Model):
(0,0,dx + self.side_guard_dovetail_height),
).moved((0, 0, -dx))
def side_guard(self, attach_left: AttachPoint, attach_right: AttachPoint) -> Cq.Workplane:
def side_guard_frontal_slot(self) -> Cq.Workplane:
angle = 360 / self.facets
outer = Cq.Solid.makeCone(
radius1=self.radius_lower_front + self.thickness,
radius2=self.radius_upper_front + self.thickness,
height=self.height,
angleDegrees=angle,
)
inner = Cq.Solid.makeCone(
radius1=self.radius_lower_front,
radius2=self.radius_upper_front,
height=self.height,
angleDegrees=angle,
)
shell = (
outer.cut(inner)
.rotate((0,0,0), (0,0,1), -angle/2)
)
# Generate the sector intersector
intersector = Cq.Solid.makeCylinder(
radius=self.radius_upper + self.side_guard_thickness,
height=self.front_wing_height,
angleDegrees=self.front_wing_angle,
).moved(Cq.Location(0,0,self.front_wing_dh,0,0,-self.front_wing_angle/2))
return shell * intersector
def side_guard(
self,
attach_left: AttachPoint,
attach_right: AttachPoint,
) -> 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_span = 360 / 5
angle_span = 360 / self.facets
outer = Cq.Solid.makeCone(
radius1=self.radius_lower + self.side_guard_thickness,
radius2=self.radius_upper + self.side_guard_thickness,
@ -426,15 +485,20 @@ class Crown(Model):
# )
#)
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),
# Create the slots
for sign in [-1, 1]:
slot = Cq.Solid.makeBox(
length=self.height,
width=self.slot_width,
height=self.slot_thickness,
).moved(
Cq.Location.rot2d(sign * self.side_guard_slot_angle) *
Cq.Location(self.radius_lower + self.side_guard_thickness/2, 0, 0) *
Cq.Location(0,0,0,0,-180 + self.slot_tilt,0) *
Cq.Location(-self.slot_thickness,-self.slot_width/2, -self.slot_thickness/2)
)
result = result - hole
result = result - slot
radius_attach = self.radius_lower + self.side_guard_thickness / 2
# tilt the dovetail by radius differential
@ -443,12 +507,15 @@ class Crown(Model):
loc_dovetail_left = Cq.Location.rot2d(angle_span / 2) * Cq.Location(radius_attach, 0, 0, 0, angle_tilt, 0)
loc_dovetail_right = Cq.Location.rot2d(-angle_span / 2) * Cq.Location(radius_attach, 0, 0, 0, angle_tilt, 0)
angle_slot = 180 / self.facets - self.front_wing_angle / 2
match attach_left:
case AttachPoint.DOVETAIL_IN:
loc_dovetail_left *= Cq.Location.rot2d(180)
result = result - dovetail.moved(loc_dovetail_left)
case AttachPoint.DOVETAIL_OUT:
result = result + dovetail.moved(loc_dovetail_left)
case AttachPoint.SLOT:
result = result - self.side_guard_frontal_slot().moved(Cq.Location.rot2d(angle_slot))
case AttachPoint.NONE:
pass
match attach_right:
@ -457,6 +524,8 @@ class Crown(Model):
case AttachPoint.DOVETAIL_OUT:
loc_dovetail_right *= Cq.Location.rot2d(180)
result = result + dovetail.moved(loc_dovetail_right)
case AttachPoint.SLOT:
result = result - self.side_guard_frontal_slot().moved(Cq.Location.rot2d(-angle_slot))
case AttachPoint.NONE:
pass
# Remove parts below the horizontal
@ -466,6 +535,12 @@ class Crown(Model):
height=cut_h).moved((0,0,-cut_h))
return result
@target(name="side_guard_1")
def side_guard_1(self) -> Cq.Workplane:
return self.side_guard(
attach_left=AttachPoint.SLOT,
attach_right=AttachPoint.DOVETAIL_IN,
)
@target(name="side_guard_2")
def side_guard_2(self) -> Cq.Workplane:
return self.side_guard(
@ -475,9 +550,15 @@ class Crown(Model):
@target(name="side_guard_3")
def side_guard_3(self) -> Cq.Workplane:
return self.side_guard(
attach_left=AttachPoint.DOVETAIL_IN,
attach_left=AttachPoint.DOVETAIL_OUT,
attach_right=AttachPoint.DOVETAIL_IN,
)
@target(name="side_guard_3")
def side_guard_4(self) -> Cq.Workplane:
return self.side_guard(
attach_left=AttachPoint.DOVETAIL_OUT,
attach_right=AttachPoint.SLOT,
)
def front_surrogate(self) -> Cq.Workplane:
"""
@ -486,14 +567,14 @@ class Crown(Model):
"""
angle = 360 / 5
outer = Cq.Solid.makeCone(
radius1=self.radius_lower + self.thickness,
radius2=self.radius_upper + self.thickness,
radius1=self.radius_lower_front + self.thickness,
radius2=self.radius_upper_front + self.thickness,
height=self.height,
angleDegrees=angle,
)
inner = Cq.Solid.makeCone(
radius1=self.radius_lower,
radius2=self.radius_upper,
radius1=self.radius_lower_front,
radius2=self.radius_upper_front,
height=self.height,
angleDegrees=angle,
)
@ -501,7 +582,7 @@ class Crown(Model):
outer.cut(inner)
.rotate((0,0,0), (0,0,1), -angle/2)
)
dx = math.sin(math.radians(angle / 2)) * self.radius_middle
dx = math.sin(math.radians(angle / 2)) * self.radius_middle_front
profile = (
Cq.Workplane('YZ')
.polyline([
@ -512,7 +593,7 @@ class Crown(Model):
(dx, self.height / 2),
])
.close()
.extrude(self.radius_upper + self.side_guard_thickness)
.extrude(self.radius_upper_front + self.side_guard_thickness)
.val()
)
return shell * profile
@ -521,14 +602,20 @@ class Crown(Model):
"""
New assembly using conformal mapping on the cone.
"""
side_guard = self.side_guard_2()
side_guards = [
self.side_guard_1(),
self.side_guard_2(),
self.side_guard_3(),
self.side_guard_4(),
]
a = Cq.Assembly()
for i in range(1,5):
for i,side_guard in enumerate(side_guards):
angle = -(i+1) * 360 / self.facets
a = a.addS(
side_guard,
name=f"side-{i}",
material=self.material_side,
loc=Cq.Location(rz=i*360/5)
loc=Cq.Location(rz=angle)
)
a.addS(
self.front_surrogate(),