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60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
from build123d import *
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from ocp_vscode import show
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with BuildPart() as p:
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with BuildSketch() as xy:
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with BuildLine():
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l1 = ThreePointArc((5 / 2, -1.25), (5.5 / 2, 0), (5 / 2, 1.25))
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Polyline(l1 @ 0, (0, -1.25), (0, 1.25), l1 @ 1)
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make_face()
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extrude(amount=4)
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with BuildSketch(Plane.YZ) as yz:
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Trapezoid(2.5, 4, 90 - 6, align=(Align.CENTER, Align.MIN))
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full_round(yz.edges().sort_by(SortBy.LENGTH)[0])
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circle_edge = yz.edges().filter_by(GeomType.CIRCLE)[0]
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arc_center = circle_edge.arc_center
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arc_radius = circle_edge.radius
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extrude(amount=10, mode=Mode.INTERSECT)
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# To avoid OCCT problems, don't attempt to extend the top arc, remove instead
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with BuildPart(mode=Mode.SUBTRACT) as internals:
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y = p.edges().filter_by(Axis.X).sort_by(Axis.Z)[-1].center().Z
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with BuildSketch(Plane.YZ.offset(4.25 / 2)) as yz:
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Trapezoid(2.5, y, 90 - 6, align=(Align.CENTER, Align.MIN))
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with Locations(arc_center):
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Circle(arc_radius, mode=Mode.SUBTRACT)
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extrude(amount=-(4.25 - 3.5) / 2)
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with BuildSketch(Plane.YZ.offset(3.5 / 2)) as yz:
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Trapezoid(2.5, 4, 90 - 6, align=(Align.CENTER, Align.MIN))
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extrude(amount=-3.5 / 2)
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with BuildSketch(Plane.XZ.offset(-2)) as xz:
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with Locations((0, 4)):
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RectangleRounded(4.25, 7.5, 0.5)
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extrude(amount=4, mode=Mode.INTERSECT)
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with Locations(p.faces(Select.LAST).filter_by(GeomType.PLANE).sort_by(Axis.Z)[-1]):
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CounterBoreHole(0.625 / 2, 1.25 / 2, 0.5)
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with BuildSketch(Plane.YZ) as rib:
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with Locations((0, 0.25)):
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Trapezoid(0.5, 1, 90 - 8, align=(Align.CENTER, Align.MIN))
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full_round(rib.edges().sort_by(SortBy.LENGTH)[0])
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extrude(amount=4.25 / 2)
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mirror(about=Plane.YZ)
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part = scale(p.part, IN)
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got_mass = part.volume * 7800e-6 / LB
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want_mass = 3.923
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tolerance = 0.02
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delta = abs(got_mass - want_mass)
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print(f"Mass: {got_mass:0.1f} lbs")
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assert delta < tolerance, f"{got_mass=}, {want_mass=}, {delta=}, {tolerance=}"
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show(p)
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