Jerry
68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
"""Shared helpers for the six image-derived shaft studies.
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All source dimensions are millimetres. Parts are authored on +Z and rotated
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onto +X at export so their long axis matches the supplied reference sheets.
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"""
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from build123d import Align, Axis, Box, Cylinder, Pos
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JOIN_OVERLAP = 0.15
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def stepped_body(segments):
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"""Fuse [(diameter, length), ...] into one robust coaxial solid."""
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body = None
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z = 0.0
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for index, (diameter, length) in enumerate(segments):
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overlap = JOIN_OVERLAP if index else 0.0
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piece = Pos(0, 0, z - overlap) * Cylinder(
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diameter / 2.0,
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length + overlap,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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)
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body = piece if body is None else body + piece
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z += length
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return body, z
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def cut_end_bore(body, total_length, diameter, depth):
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tool = Pos(0, 0, total_length - depth) * Cylinder(
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diameter / 2.0,
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depth + 1.0,
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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)
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return body - tool
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def cut_side_flat(body, diameter, z_start, length, flat_depth):
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"""Cut one axial wrench/key flat into the +X side of a round shaft."""
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x_start = diameter / 2.0 - flat_depth
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tool = Pos(x_start, 0, z_start) * Box(
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diameter,
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diameter * 1.5,
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length,
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align=(Align.MIN, Align.CENTER, Align.MIN),
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)
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return body - tool
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def add_thread_rings(body, z_start, length, major_diameter, pitch=2.0, rib_width=0.65):
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"""Add simplified annular thread indication (not a true helical thread)."""
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count = max(1, int(length // pitch))
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for index in range(count):
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z = z_start + index * pitch
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ring = Pos(0, 0, z) * Cylinder(
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major_diameter / 2.0,
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min(rib_width, z_start + length - z),
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align=(Align.CENTER, Align.CENTER, Align.MIN),
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)
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body = body + ring
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return body
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def export_horizontal(body, label):
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result = body.rotate(Axis.Y, 90)
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result.label = label
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return result
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