60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
import math
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import cadquery as Cq
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def torsion_spring(radius=12,
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height=20,
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thickness=2,
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omega=90,
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tail_length=25,
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right_handed: bool = False):
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"""
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Produces a torsion spring with abridged geometry since sweep is very slow in
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cq-editor.
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"""
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if right_handed:
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omega = -omega
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base = (
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Cq.Workplane('XY')
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.cylinder(height=height, radius=radius,
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centered=(True, True, False))
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)
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base.faces(">Z").tag("top")
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base.faces("<Z").tag("bot")
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box_shift = -radius if right_handed else radius-thickness
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result = (
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base
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.cylinder(height=height, radius=radius - thickness, combine='s',
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centered=(True, True, True))
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.transformed(
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offset=(0, box_shift),
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rotate=(0, 0, 0))
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.box(
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length=tail_length,
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width=thickness,
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height=thickness,
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centered=False)
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.copyWorkplane(Cq.Workplane('XY'))
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.transformed(
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offset=(0, 0, height - thickness),
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rotate=(0, 0, omega))
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.center(-tail_length, box_shift)
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.box(
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length=tail_length,
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width=thickness,
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height=thickness,
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centered=False)
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)
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r = -radius if right_handed else radius
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plane = result.copyWorkplane(Cq.Workplane('XY'))
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plane.polyline([(0, r, 0), (tail_length, r, 0)],
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forConstruction=True).tag("dir_bot")
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omega = math.radians(omega)
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c, s = math.cos(omega), math.sin(omega)
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l = -tail_length
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plane.polyline([
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(-s * r, c * r, height),
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(c * l - s * r, c * r + s * l, height)],
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forConstruction=True).tag("dir_top")
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return result
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