Jerry
123 lines
4.0 KiB
Python
123 lines
4.0 KiB
Python
from math import cos, radians, sin, tau
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from build123d import Align, BuildPart, Cylinder, Location, Locations, Mode
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from benchmark_common import circular_edges, polar_point, safe_fillet
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BARREL_DIAMETER = 36.0
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BARREL_HEIGHT = 70.0
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FIN_COUNT = 12
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FIN_DIAMETER = 62.0
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FIN_THICKNESS = 2.0
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FIN_Z_VALUES = tuple(10.0 + 5.0 * index for index in range(FIN_COUNT))
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BASE_FLANGE_DIAMETER = 70.0
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BASE_FLANGE_THICKNESS = 8.0
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MOUNT_HOLE_COUNT = 6
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MOUNT_HOLE_DIAMETER = 5.0
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MOUNT_BOLT_CIRCLE_DIAMETER = 56.0
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TOP_CAP_DIAMETER = 44.0
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TOP_CAP_BOTTOM_Z = 70.0
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TOP_CAP_HEIGHT = 8.0
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BOSS_DIAMETER = 12.0
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BOSS_LENGTH = 24.0
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BOSS_ANGLE_DEGREES = 35.0
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BOSS_BORE_DIAMETER = 5.0
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EDGE_FILLET = 0.95
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def _boss_center() -> tuple[float, float, float]:
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angle = radians(BOSS_ANGLE_DEGREES)
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start = (TOP_CAP_DIAMETER / 2.0 - 1.0, 0.0, TOP_CAP_BOTTOM_Z + TOP_CAP_HEIGHT / 2.0)
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direction = (cos(angle), 0.0, sin(angle))
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return (
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start[0] + direction[0] * BOSS_LENGTH / 2.0,
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0.0,
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start[2] + direction[2] * BOSS_LENGTH / 2.0,
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)
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def _edge_fillets(part):
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edges = []
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for z_pos in FIN_Z_VALUES:
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edges.extend(circular_edges(part, radius=FIN_DIAMETER / 2.0, axis="z", coordinate=z_pos))
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edges.extend(circular_edges(part, radius=FIN_DIAMETER / 2.0, axis="z", coordinate=z_pos + FIN_THICKNESS))
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edges.extend(circular_edges(part, radius=BASE_FLANGE_DIAMETER / 2.0, axis="z", coordinate=0.0))
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edges.extend(circular_edges(part, radius=BASE_FLANGE_DIAMETER / 2.0, axis="z", coordinate=BASE_FLANGE_THICKNESS))
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return edges
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def gen_step():
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"""Return the radial-engine-style cylinder benchmark model in millimeters."""
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boss_rotation_y = 90.0 - BOSS_ANGLE_DEGREES
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boss_center = _boss_center()
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with BuildPart() as cylinder:
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Cylinder(
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radius=BARREL_DIAMETER / 2.0,
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height=BARREL_HEIGHT,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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)
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Cylinder(
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radius=BASE_FLANGE_DIAMETER / 2.0,
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height=BASE_FLANGE_THICKNESS,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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mode=Mode.ADD,
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)
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for z_pos in FIN_Z_VALUES:
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with Locations(Location((0.0, 0.0, z_pos))):
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Cylinder(
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radius=FIN_DIAMETER / 2.0,
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height=FIN_THICKNESS,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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mode=Mode.ADD,
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)
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with Locations(Location((0.0, 0.0, TOP_CAP_BOTTOM_Z))):
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Cylinder(
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radius=TOP_CAP_DIAMETER / 2.0,
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height=TOP_CAP_HEIGHT,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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mode=Mode.ADD,
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)
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with Locations(Location(boss_center)):
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Cylinder(
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radius=BOSS_DIAMETER / 2.0,
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height=BOSS_LENGTH,
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rotation=(0.0, boss_rotation_y, 0.0),
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align=(Align.CENTER, Align.CENTER, Align.CENTER),
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mode=Mode.ADD,
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)
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for index in range(MOUNT_HOLE_COUNT):
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x_pos, y_pos = polar_point(MOUNT_BOLT_CIRCLE_DIAMETER / 2.0, tau * index / MOUNT_HOLE_COUNT)
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with Locations(Location((x_pos, y_pos, -1.0))):
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Cylinder(
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radius=MOUNT_HOLE_DIAMETER / 2.0,
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height=BASE_FLANGE_THICKNESS + 2.0,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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mode=Mode.SUBTRACT,
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)
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with Locations(Location(boss_center)):
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Cylinder(
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radius=BOSS_BORE_DIAMETER / 2.0,
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height=BOSS_LENGTH + 6.0,
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rotation=(0.0, boss_rotation_y, 0.0),
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align=(Align.CENTER, Align.CENTER, Align.CENTER),
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mode=Mode.SUBTRACT,
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)
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part = cylinder.part
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part = safe_fillet(part, _edge_fillets(part), radius=EDGE_FILLET)
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part.label = "benchmark_07_radial_engine_cylinder_cooling_fins"
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return part
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