Jerry
79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
"""Parametric 28-tooth spur gear generated with SimpleCADAPI."""
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import json
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from pathlib import Path
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import simplecadapi as scad
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N_TEETH = 28
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MODULE_MM = 1.0
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PRESSURE_ANGLE_DEG = 20.0
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THICKNESS_MM = 4.0
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BORE_DIAMETER_MM = 5.0
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ADDENDUM_FACTOR = 1.0
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CLEARANCE_FACTOR = 0.25
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BACKLASH_MM = 0.0
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def generate() -> None:
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output_dir = Path(__file__).resolve().parent
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with scad.GraphSession() as session:
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gear_blank = scad.std.gear.make_spur_gear_rsolid(
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n_teeth=N_TEETH,
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module=MODULE_MM,
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pressure_angle=PRESSURE_ANGLE_DEG,
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gear_height=THICKNESS_MM,
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addendum_factor=ADDENDUM_FACTOR,
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clearance_factor=CLEARANCE_FACTOR,
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backlash=BACKLASH_MM,
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)
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blank_faces = scad.ql.select(items=gear_blank.get_faces()).all()
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print("gear_blank_faces", len(blank_faces))
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bore = scad.make_cylinder_rsolid(
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radius=BORE_DIAMETER_MM / 2.0,
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height=THICKNESS_MM + 2.0,
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bottom_face_center=(0.0, 0.0, -1.0),
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axis=(0.0, 0.0, 1.0),
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)
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gear = scad.cut_rsolid(gear_blank, bore, skip_non_intersecting=False)
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gear = scad.apply_tag(shape=gear, tag="role.power_transmission.gear")
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final_faces = scad.ql.select(items=gear.get_faces()).all()
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final_edges = scad.ql.select(items=gear.get_edges()).all()
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print("final_topology", {"faces": len(final_faces), "edges": len(final_edges)})
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model_json = scad.export_model_json(session=session, indent=2)
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(output_dir / "gear_28t_4mm.model.json").write_text(model_json, encoding="utf-8")
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scad.export_step(shapes=gear, filename=str(output_dir / "gear_28t_4mm.step"))
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scad.export_stl(shapes=gear, filename=str(output_dir / "gear_28t_4mm.stl"))
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pitch_diameter_mm = MODULE_MM * N_TEETH
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outside_diameter_mm = MODULE_MM * (N_TEETH + 2.0 * ADDENDUM_FACTOR)
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root_diameter_mm = MODULE_MM * (
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N_TEETH - 2.0 * (ADDENDUM_FACTOR + CLEARANCE_FACTOR)
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)
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validation = {
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"n_teeth": N_TEETH,
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"pitch_diameter_mm": pitch_diameter_mm,
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"outside_diameter_mm": outside_diameter_mm,
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"root_diameter_mm": root_diameter_mm,
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"thickness_mm": THICKNESS_MM,
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"bore_diameter_mm": BORE_DIAMETER_MM,
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"volume_mm3": round(gear.get_volume(), 6),
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"faces": len(final_faces),
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"edges": len(final_edges),
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"tags": scad.list_tags(shape=gear),
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"graph_nodes": session.graph.node_count,
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}
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(output_dir / "validation.json").write_text(
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json.dumps(validation, indent=2, ensure_ascii=False) + "\n",
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encoding="utf-8",
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)
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print("validation", validation)
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if __name__ == "__main__":
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generate()
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