python_tools/cadquery_heavy_duty_hook.py

from __future__ import annotations

import argparse
import json
from pathlib import Path

import cadquery as cq
from cadquery import exporters


def build_fixture() -> cq.Workplane:
    base_width = 50
    base_height = 80
    base_thickness = 6
    corner_radius = 4

    hole_dia = 5.2
    csk_dia = 10
    csk_angle = 82
    hole_inset_x = 10
    hole_inset_y = 12

    shaft_width = 14
    shaft_depth = 12
    shaft_length = 35
    hook_inner_radius = 16
    hook_outer_radius = hook_inner_radius + shaft_depth

    gusset_thickness = 6
    bottom_gusset_length = 25
    bottom_gusset_height = 18
    top_gusset_length = 15
    top_gusset_height = 12

    base = (
        cq.Workplane("XY")
        .box(base_width, base_height, base_thickness)
        .edges("|Z")
        .fillet(corner_radius)
    )

    hx = base_width / 2 - hole_inset_x
    hy = base_height / 2 - hole_inset_y
    pts = [(hx, hy), (-hx, hy), (hx, -hy), (-hx, -hy)]

    base = (
        base.faces(">Z")
        .workplane()
        .pushPoints(pts)
        .cskHole(diameter=hole_dia, cskDiameter=csk_dia, cskAngle=csk_angle)
    )

    z_start = base_thickness / 2
    z_arc_center = z_start + shaft_length
    y_inner_start = shaft_depth / 2
    y_outer_start = -shaft_depth / 2

    hook = (
        cq.Workplane("YZ")
        .moveTo(y_outer_start, z_start)
        .lineTo(y_outer_start, z_arc_center)
        .threePointArc(
            (y_outer_start + hook_outer_radius, z_arc_center + hook_outer_radius),
            (y_outer_start + 2 * hook_outer_radius, z_arc_center),
        )
        .threePointArc(
            (y_outer_start + 2 * hook_outer_radius - shaft_depth / 2, z_arc_center - shaft_depth / 2),
            (y_outer_start + 2 * hook_outer_radius - shaft_depth, z_arc_center),
        )
        .threePointArc(
            (y_inner_start + hook_inner_radius, z_arc_center + hook_inner_radius),
            (y_inner_start, z_arc_center),
        )
        .lineTo(y_inner_start, z_start)
        .close()
        .extrude(shaft_width / 2, both=True)
    )

    bottom_gusset = (
        cq.Workplane("YZ")
        .moveTo(y_outer_start, z_start)
        .lineTo(y_outer_start - bottom_gusset_length, z_start)
        .lineTo(y_outer_start, z_start + bottom_gusset_height)
        .close()
        .extrude(gusset_thickness / 2, both=True)
    )

    top_gusset = (
        cq.Workplane("YZ")
        .moveTo(y_inner_start, z_start)
        .lineTo(y_inner_start + top_gusset_length, z_start)
        .lineTo(y_inner_start, z_start + top_gusset_height)
        .close()
        .extrude(gusset_thickness / 2, both=True)
    )

    return base.union(hook).union(bottom_gusset).union(top_gusset)


def main() -> None:
    parser = argparse.ArgumentParser(description="Build the CadQuery heavy-duty hook sample.")
    parser.add_argument("--out-dir", required=True)
    args = parser.parse_args()

    out_dir = Path(args.out_dir)
    out_dir.mkdir(parents=True, exist_ok=True)
    stl_path = out_dir / "heavy_duty_hook.stl"

    fixture = build_fixture()
    exporters.export(fixture, str(stl_path))

    bbox = fixture.val().BoundingBox()
    print(
        json.dumps(
            {
                "name": "Heavy_Duty_Hook",
                "stl_path": str(stl_path),
                "bounding_box": {
                    "xlen": bbox.xlen,
                    "ylen": bbox.ylen,
                    "zlen": bbox.zlen,
                    "xmin": bbox.xmin,
                    "xmax": bbox.xmax,
                    "ymin": bbox.ymin,
                    "ymax": bbox.ymax,
                    "zmin": bbox.zmin,
                    "zmax": bbox.zmax,
                },
                "cadquery_features": [
                    "filleted base plate",
                    "four countersunk mounting holes",
                    "sketched curved J hook profile",
                    "bottom triangular gusset",
                    "top triangular gusset",
                    "single CadQuery unioned fixture",
                ],
            }
        )
    )


if __name__ == "__main__":
    main()