{
 "id": "75-sm-bracket-holes",
 "name": "Sheet metal: bracket with holes for DXF",
 "description": "80x40 base, 30 mm flange on y=0 edge and 15 mm flange on x=80 edge; two d6 holes in the base.",
 "exercises": [
  "sheet_metal",
  "edge_flange",
  "holes",
  "dxf",
  "bend_lines"
 ],
 "units": {
  "length": "mm",
  "angle": "deg",
  "area": "mm2",
  "volume": "mm3"
 },
 "conventions": {
  "world": "right-handed; Z up. XY/XZ/YZ are the origin planes.",
  "sketch_frame": "sketch-local 2D coords; world = plane.origin + x*plane.x_dir + y*plane.y_dir (origin in mm). Profile 'loops' list sketch entity ids.",
  "point_refs": "'<id>.start' / '<id>.end' / '<id>.center' reuse (share) that existing sketch point; 'at' is its position when referenced.",
  "extrude_direction": "positive = along sketch plane normal unless stated",
  "selections": "selected faces/edges carry 'point': a world-space point on the face / the edge's parametric midpoint; pick the nearest face/edge to it."
 },
 "parameters": [],
 "features": [
  {
   "op": "sketch",
   "name": "Base",
   "plane": {
    "ref": "XY",
    "origin": [
     0.0,
     0.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     0.0,
     0.0,
     1.0
    ]
   },
   "entities": [
    {
     "type": "line",
     "start": {
      "at": [
       0,
       0
      ]
     },
     "end": {
      "at": [
       80,
       0
      ]
     },
     "id": "l1"
    },
    {
     "type": "line",
     "start": {
      "ref": "l1.end",
      "at": [
       80.0,
       0.0
      ]
     },
     "end": {
      "at": [
       80,
       40
      ]
     },
     "id": "l2"
    },
    {
     "type": "line",
     "start": {
      "ref": "l2.end",
      "at": [
       80.0,
       40.0
      ]
     },
     "end": {
      "at": [
       0,
       40
      ]
     },
     "id": "l3"
    },
    {
     "type": "line",
     "start": {
      "ref": "l3.end",
      "at": [
       0.0,
       40.0
      ]
     },
     "end": {
      "ref": "l1.start",
      "at": [
       0.0,
       0.0
      ]
     },
     "id": "l4"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "sm_flange",
   "type": "base",
   "name": "BaseFlange",
   "profile": {
    "sketch": "Base",
    "loops": [
     {
      "outer": true,
      "curves": [
       "l1",
       "l2",
       "l3",
       "l4"
      ]
     }
    ]
   },
   "orientation": "Side 1 (default): thickness grows along the sketch normal (+Z)",
   "operation": "new body",
   "rule": "Steel (mm)"
  },
  {
   "op": "sm_flange",
   "type": "edge",
   "edges": [
    {
     "type": "line",
     "start": [
      0.0,
      0.0,
      2.5
     ],
     "end": [
      80.0,
      0.0,
      2.5
     ],
     "point": [
      40.0,
      0.0,
      2.5
     ]
    }
   ],
   "edge_selection": "top edge at y=0",
   "height": 30,
   "angle": 90,
   "height_datum": "Outer Faces (default)",
   "bend_position": "Inside (default)",
   "bend_radius": "rule (default)",
   "flip": false
  },
  {
   "op": "sm_flange",
   "type": "edge",
   "edges": [
    {
     "type": "line",
     "start": [
      80.0,
      5.0,
      2.5
     ],
     "end": [
      80.0,
      40.0,
      2.5
     ],
     "point": [
      80.0,
      22.5,
      2.5
     ]
    }
   ],
   "edge_selection": "top edge at x=80 of the base",
   "height": 15,
   "angle": 90,
   "height_datum": "Outer Faces (default)",
   "bend_position": "Inside (default)",
   "bend_radius": "rule (default)",
   "flip": false
  },
  {
   "op": "sketch",
   "name": "Holes",
   "plane": {
    "ref": "XY",
    "origin": [
     0.0,
     0.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     0.0,
     0.0,
     1.0
    ]
   },
   "entities": [
    {
     "type": "circle",
     "center": {
      "at": [
       25,
       20
      ]
     },
     "radius": 3,
     "id": "c1"
    },
    {
     "type": "circle",
     "center": {
      "at": [
       55,
       20
      ]
     },
     "radius": 3,
     "id": "c2"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "extrude",
   "name": "Holes",
   "operation": "cut",
   "profiles": [
    {
     "sketch": "Holes",
     "loops": [
      {
       "outer": true,
       "curves": [
        "c1"
       ]
      }
     ]
    },
    {
     "sketch": "Holes",
     "loops": [
      {
       "outer": true,
       "curves": [
        "c2"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "through_all",
    "direction": "positive"
   },
   "result_bodies": [
    "Body1"
   ]
  }
 ]
}