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Add angle joint stub, hole in rotor

This commit is contained in:
Leni Aniva 2025-05-12 14:50:59 -07:00
parent 74145f88d2
commit 97675a2fc8
Signed by: aniva
GPG Key ID: D5F96287843E8DFB
1 changed files with 113 additions and 9 deletions
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122
nhf/touhou/yasaka_kanako/onbashira.py
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@ -3,7 +3,7 @@ from nhf.materials import Role, Material
import nhf.utils
import math
from dataclasses import dataclass
from dataclasses import dataclass, field
import cadquery as Cq
@dataclass
@ -13,28 +13,43 @@ class Onbashira(Model):
# Dimensions of each side panel
side_width: float = 200.0
side_length: float = 600.0
side_thickness: float = 25.4 / 8
# Joints between two sets of side panels
angle_joint_thickness: float = 25.4 / 4
# Z-axis size of each angle joint
angle_joint_depth: float = 50.0
# Gap of each angle joint to connect the outside to the inside
angle_joint_gap: float = 10.0
angle_joint_bolt_length: float = 50.0
angle_joint_bolt_diam: float = 10.0
# Position of the holes, with (0, 0) being the centre of each side
angle_joint_hole_position: list[float] = field(default_factory=lambda: [
(20, 20),
(70, 20),
])
# Dimensions of gun barrels
barrel_diam: float = 25.4 * 2
barrel_length: float = 300.0
# Radius from barrel centre to axis
rotation_radius: float = 75.0
rotation_radius: float = 90.0
n_bearing_balls: int = 24
# Size of ball bearings
bearing_ball_diam: float = 25.4 * 1/2
bearing_ball_gap: float = .5
# Thickness of bearing disks
bearing_thickness: float = 20.0
bearing_track_radius: float = 120.0
bearing_track_radius: float = 135.0
# Gap between the inner and outer bearing disks
bearing_gap: float = 10.0
bearing_disk_thickness: float = 25.4 / 8
rotor_inner_radius: float = 55.0
rotor_bind_bolt_diam: float = 10.0
rotor_bind_radius: float = 50.0
stator_bind_radius: float = 150.0
rotor_bind_radius: float = 110.0
stator_bind_radius: float = 170.0
material_side: Material = Material.WOOD_BIRCH
material_bearing: Material = Material.PLASTIC_PLA
@ -47,18 +62,37 @@ class Onbashira(Model):
assert self.bulk_radius - self.side_thickness - self.bearing_thickness - self.bearing_diam > self.rotation_radius + self.barrel_diam / 2
assert self.bearing_gap < 0.95 * self.bearing_ball_diam
assert self.rotor_bind_bolt_diam < self.rotor_bind_radius < self.bearing_track_radius
assert self.bearing_track_radius < self.stator_bind_radius
assert self.rotor_inner_radius < self.bearing_track_radius < self.stator_bind_radius
assert self.angle_joint_thickness > self.side_thickness
@property
def angle_side(self) -> float:
return 360 / self.n_side
@property
def side_width_inner(self) -> float:
"""
Interior side width
If outer width is `wi`, inner width is `wo`, each side's cross section
is a trapezoid with sides `wi`, `wo`, and height `h` (side thickness)
"""
theta = math.pi / self.n_side
dt = self.side_thickness * math.tan(theta)
return self.side_width - dt * 2
@property
def angle_joint_extra_width(self) -> float:
theta = math.pi / self.n_side
dt = self.angle_joint_thickness * math.tan(theta)
return dt * 2
@property
def angle_dihedral(self) -> float:
return 180 - self.angle_side
@property
def bulk_radius(self) -> float:
"""
Calculate radius of the bulk to the centre
Radius of the bulk (surface of each side) to the centre
"""
return self.side_width / 2 / math.tan(math.radians(self.angle_side / 2))
@property
@ -78,7 +112,7 @@ class Onbashira(Model):
def profile_bearing_stator(self) -> Cq.Sketch:
return (
Cq.Sketch()
.regularPolygon(self.side_width, self.n_side)
.regularPolygon(self.side_width - self.side_thickness, self.n_side)
.circle(self.bearing_track_radius + self.bearing_gap/2, mode="s")
.reset()
.regularPolygon(
@ -99,6 +133,7 @@ class Onbashira(Model):
return (
Cq.Sketch()
.circle(self.bearing_track_radius - self.bearing_gap/2)
.circle(self.rotor_inner_radius, mode="s")
.reset()
.regularPolygon(
self.rotation_radius, self.n_side,
@ -143,6 +178,9 @@ class Onbashira(Model):
@target(name="pipe", kind=TargetKind.DXF)
def pipe(self) -> Cq.Sketch:
"""
The rotating pipes. Purely for decoration
"""
pass
@target(name="side-panel", kind=TargetKind.DXF)
@ -160,6 +198,7 @@ class Onbashira(Model):
.placeSketch(self.profile_side_panel())
.extrude(self.side_thickness)
)
# Bevel the edges
intersector = (
Cq.Workplane('XZ')
.polyline([
@ -174,6 +213,71 @@ class Onbashira(Model):
# Intersect the side panel
return result * intersector
def angle_joint(self) -> Cq.Workplane:
"""
Angular joint between two side panels. This sits at the intersection of
4 side panels to provide compressive, shear, and tensile strength.
To provide tensile strength along the Z-axis, the panels must be bolted
onto the angle joint.
"""
# Create the slot carving
slot = (
Cq.Sketch()
.regularPolygon(
self.side_width,
self.n_side
)
.regularPolygon(
self.side_width_inner,
self.n_side, mode="s",
)
)
slot = (
Cq.Workplane()
.placeSketch(slot)
.extrude(self.angle_joint_depth)
)
# Construct the overall shape of the joint, and divide it into sections for printing later.
sketch = (
Cq.Sketch()
.regularPolygon(
self.side_width + self.angle_joint_extra_width,
self.n_side
)
.regularPolygon(
self.side_width - self.angle_joint_extra_width,
self.n_side, mode="s"
)
)
h = (self.bulk_radius + self.angle_joint_extra_width) * 2
# Intersector for 1/n of the ring
intersector = (
Cq.Workplane()
.sketch()
.polygon([
(0, 0),
(h, 0),
(h, h * math.tan(2 * math.pi / self.n_side))
])
.finalize()
.extrude(self.angle_joint_depth*4)
.translate((0, 0, -self.angle_joint_depth*2))
)
result = (
Cq.Workplane()
.placeSketch(sketch)
.extrude(self.angle_joint_depth)
.translate((0, 0, -self.angle_joint_depth/2))
.cut(slot.translate((0, 0, self.angle_joint_gap/2)))
.cut(slot.translate((0, 0, -self.angle_joint_depth-self.angle_joint_gap/2)))
.intersect(intersector)
)
return result
def bearing_ball(self) -> Cq.Solid: