389 lines
11 KiB
Python
389 lines
11 KiB
Python
import math
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from dataclasses import dataclass, field
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import cadquery as Cq
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from nhf import Material, Role
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from nhf.build import Model, target, assembly, TargetKind
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import nhf.utils
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@dataclass
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class Crown(Model):
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facets: int = 5
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# Lower circumference
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base_circ: float = 538.0
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# Upper circumference
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tilt_circ: float = 640.0
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height: float = 120.0
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margin: float = 10.0
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thickness: float = 0.4 # 26 Gauge
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material: Material = Material.METAL_BRASS
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def __post_init__(self):
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super().__init__(name="crown")
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assert self.tilt_circ > self.base_circ
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assert self.facet_width_upper / 2 > self.height / 2, "Top angle must be > 90 degrees"
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@property
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def facet_width_lower(self):
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return self.base_circ / self.facets
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@property
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def facet_width_upper(self):
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return self.tilt_circ / self.facets
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def profile_base(self) -> Cq.Sketch:
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# Generate the pentagonal shape
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dx_l = self.facet_width_lower
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dx_u = self.facet_width_upper
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dy = self.height
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return (
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Cq.Sketch()
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.polygon([
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(dx_l/2, 0),
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(dx_u/2, dy/2),
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(0, dy),
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(-dx_u/2, dy/2),
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(-dx_l/2, 0),
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])
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)
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@target(name="side", kind=TargetKind.DXF)
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def profile_side(self) -> Cq.Sketch:
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dy = self.facet_width_upper * 0.1
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x_side = self.facet_width_upper
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y_tip = self.height - self.margin
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eye = (
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Cq.Sketch()
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.segment(
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(0, y_tip),
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(dy, y_tip - dy),
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)
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.segment(
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(0, y_tip),
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(-dy, y_tip - dy),
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)
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.bezier([
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(dy, y_tip - dy),
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(0, y_tip - dy/2),
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(0, y_tip - dy/2),
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(-dy, y_tip - dy),
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])
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.assemble()
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)
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return (
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self.profile_base()
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.boolean(eye, mode='s')
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)
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@target(name="dot", kind=TargetKind.DXF)
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def profile_dot(self) -> Cq.Sketch:
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return (
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Cq.Sketch()
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.circle(self.margin / 2)
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)
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@target(name="front", kind=TargetKind.DXF)
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def profile_front(self) -> Cq.Sketch:
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dx_l = self.facet_width_lower
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dx_u = self.facet_width_upper
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dy = self.height
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window_length = dy / 5
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window_height = self.margin / 2
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window = (
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Cq.Sketch()
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.rect(window_length, window_height)
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)
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window_p1 = Cq.Location.from2d(
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dx_u/2 - self.margin - window_length * 0.4,
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dy/2 + self.margin/2,
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math.degrees(math.atan2(dy/2, -dx_u/2)),
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)
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window_p2 = Cq.Location.from2d(
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dx_l/2 - self.margin + window_length * 0.15,
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window_length/2 + self.margin,
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math.degrees(math.atan2(dy/2, (dx_u-dx_l)/2)),
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)
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# Carve the scale
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z = dy * 1/64 # "Pen" Thickness
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scale_pan_x = dx_l / 2 * 0.6
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scale_pan_y = dy / 2 * 0.7
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pan_dx = dx_l * 1/4
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pan_dy = dy * 1/16
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scale_pan = (
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Cq.Sketch()
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.arc(
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(- pan_dx/2, pan_dy),
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(0, 0),
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(+ pan_dx/2, pan_dy),
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)
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.segment(
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(+pan_dx/2, pan_dy),
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(+pan_dx/2 - z, pan_dy),
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)
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.arc(
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(-pan_dx/2 + z, pan_dy),
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(0, z),
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(+pan_dx/2 - z, pan_dy),
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)
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.segment(
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(-pan_dx/2, pan_dy),
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(-pan_dx/2 + z, pan_dy),
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)
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.assemble()
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)
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loc_scale_pan = Cq.Location.from2d(scale_pan_x, scale_pan_y)
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loc_scale_pan2 = Cq.Location.from2d(-scale_pan_x, scale_pan_y)
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scale_base_y = dy / 2 * 0.36
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scale_base_x = dx_l / 10
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assert scale_base_y < scale_pan_y
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assert scale_base_x < scale_pan_x
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scale_body = (
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Cq.Sketch()
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.arc(
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(scale_pan_x, scale_pan_y),
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(0, scale_base_y),
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(-scale_pan_x, scale_pan_y),
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)
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.segment(
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(-scale_pan_x, scale_pan_y),
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(-scale_pan_x+z, scale_pan_y+z),
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)
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.arc(
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(scale_pan_x - z, scale_pan_y+z),
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(0, scale_base_y + z),
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(-scale_pan_x + z, scale_pan_y+z),
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)
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.segment(
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(scale_pan_x, scale_pan_y),
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(scale_pan_x-z, scale_pan_y+z),
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)
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.assemble()
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.polygon([
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(scale_base_x, scale_base_y + z/2),
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(scale_base_x, self.margin),
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(scale_base_x-z, self.margin),
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(scale_base_x-z, scale_base_y-z),
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(-scale_base_x+z, scale_base_y-z),
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(-scale_base_x+z, self.margin),
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(-scale_base_x, self.margin),
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(-scale_base_x, scale_base_y + z/2),
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], mode='a')
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)
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# Needle
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needle_y_top = dy - self.margin
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needle_y_mid = dy * 0.7
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needle_dx = scale_base_x * 2
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y_shoulder = needle_y_mid - z * 2
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needle = (
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Cq.Sketch()
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.segment(
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(0, needle_y_mid),
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(z, y_shoulder),
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)
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.segment(
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(z, y_shoulder),
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(z, scale_base_y),
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)
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.segment(
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(z, scale_base_y),
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(-z, scale_base_y),
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)
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.segment(
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(-z, y_shoulder),
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(-z, scale_base_y),
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)
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.segment(
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(-z, y_shoulder),
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(0, needle_y_mid),
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)
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.assemble()
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)
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z2 = z * 2
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y1 = needle_y_mid + z2
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needle_head = (
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Cq.Sketch()
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.segment(
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(z, needle_y_mid),
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(z, y1),
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)
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.segment(
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(-z, needle_y_mid),
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(-z, y1),
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)
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# Outer edge
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.bezier([
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(0, needle_y_top),
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(0, (needle_y_top + needle_y_mid)/2),
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(needle_dx, (needle_y_top + needle_y_mid)/2),
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(z, needle_y_mid),
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])
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.bezier([
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(0, needle_y_top),
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(0, (needle_y_top + needle_y_mid)/2),
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(-needle_dx, (needle_y_top + needle_y_mid)/2),
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(-z, needle_y_mid),
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])
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# Inner edge
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.bezier([
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(0, needle_y_top - z2),
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(0, (needle_y_top + needle_y_mid)/2),
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(needle_dx-z2*2, (needle_y_top + needle_y_mid)/2),
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(z, y1),
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])
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.bezier([
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(0, needle_y_top - z2),
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(0, (needle_y_top + needle_y_mid)/2),
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(-needle_dx+z2*2, (needle_y_top + needle_y_mid)/2),
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(-z, y1),
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])
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.assemble()
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)
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return (
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self.profile_base()
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.boolean(window.moved(window_p1), mode='s')
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.boolean(window.moved(window_p1.flip_x()), mode='s')
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.boolean(window.moved(window_p2), mode='s')
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.boolean(window.moved(window_p2.flip_x()), mode='s')
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.boolean(scale_pan.moved(loc_scale_pan), mode='s')
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.boolean(scale_pan.moved(loc_scale_pan2), mode='s')
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.boolean(scale_body, mode='s')
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.boolean(needle, mode='s')
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.boolean(needle_head, mode='s')
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.clean()
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)
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@target(name="side-guard", kind=TargetKind.DXF)
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def profile_side_guard(self) -> Cq.Sketch:
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dx = self.facet_width_lower / 2
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dy = self.height
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# Main control points
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p_mid = Cq.Location.from2d(0, 0.5 * dy)
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p_mid_v = Cq.Location.from2d(10/57 * dx, 0)
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p_top1 = Cq.Location.from2d(0.408 * dx, 5/24 * dy)
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p_top1_v = Cq.Location.from2d(0.13 * dx, 0)
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p_top2 = Cq.Location.from2d(0.737 * dx, 0.255 * dy)
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p_top2_c1 = p_top2 * Cq.Location.from2d(-0.105 * dx, 0.033 * dy)
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p_top2_c2 = p_top2 * Cq.Location.from2d(-0.053 * dx, -0.09 * dy)
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p_top3 = Cq.Location.from2d(0.929 * dx, 0.145 * dy)
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p_top3_v = Cq.Location.from2d(0.066 * dx, 0.033 * dy)
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p_top4 = Cq.Location.from2d(0.85 * dx, 0.374 * dy)
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p_top4_v = Cq.Location.from2d(-0.053 * dx, 0.008 * dy)
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p_top5 = Cq.Location.from2d(0.54 * dx, 0.349 * dy)
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p_top5_c1 = p_top5 * Cq.Location.from2d(0.103 * dx, 0.017 * dy)
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p_top5_c2 = p_top5 * Cq.Location.from2d(0.158 * dx, 0.034 * dy)
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p_base_c = Cq.Location.from2d(1.245 * dx, 0.55 * dy)
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p_base = Cq.Location.from2d(dx, 0)
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bezier_groups = [
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[
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p_base,
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p_base_c,
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p_top5_c2,
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p_top5,
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],
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[
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p_top5,
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p_top5_c1,
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p_top4 * p_top4_v,
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p_top4,
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],
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[
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p_top4,
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p_top4 * p_top4_v.inverse.scale(4),
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p_top3 * p_top3_v,
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p_top3,
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],
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[
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p_top3,
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p_top3 * p_top3_v.inverse,
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p_top2_c2,
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p_top2,
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],
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[
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p_top2,
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p_top2_c1,
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p_top1 * p_top1_v,
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p_top1,
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],
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[
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p_top1,
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p_top1 * p_top1_v.inverse,
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p_mid * p_mid_v,
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p_mid,
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],
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]
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sketch = (
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Cq.Sketch()
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.segment(
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p_base.to2d_pos(),
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p_base.flip_x().to2d_pos(),
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)
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)
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for bezier_group in bezier_groups:
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sketch = (
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sketch
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.bezier([p.to2d_pos() for p in bezier_group])
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.bezier([p.flip_x().to2d_pos() for p in bezier_group])
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)
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return sketch.assemble()
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def assembly(self) -> Cq.Assembly:
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front = (
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Cq.Workplane('XY')
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.placeSketch(self.profile_front())
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.extrude(self.thickness)
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)
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side = (
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Cq.Workplane('XY')
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.placeSketch(self.profile_side())
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.extrude(self.thickness)
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)
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side_guard = (
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Cq.Workplane('XY')
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.placeSketch(self.profile_side_guard())
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.extrude(self.thickness)
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)
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assembly = (
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Cq.Assembly()
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.addS(
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front,
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name="front",
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material=self.material,
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role=Role.DECORATION,
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)
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)
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for i, pos in enumerate([-2, -1, 1, 2]):
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x = self.facet_width_upper * pos
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assembly = (
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assembly
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.addS(
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side,
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name=f"side{i}",
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material=self.material,
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role=Role.DECORATION,
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loc=Cq.Location.from2d(x, 0),
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)
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.addS(
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side_guard,
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name=f"guard{i}",
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material=self.material,
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role=Role.DECORATION,
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loc=Cq.Location(x, 0, self.thickness),
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)
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)
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return assembly
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