{
 "id": "48-pulley",
 "name": "Grooved pulley",
 "description": "Revolved profile with a d10 bore and two trapezoidal V-grooves, about Z.",
 "exercises": [
  "revolve",
  "sketch_xz"
 ],
 "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": "Profile",
   "plane": {
    "ref": "XZ",
    "origin": [
     0.0,
     0.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     0.0,
     -1.0
    ],
    "normal": [
     0.0,
     1.0,
     0.0
    ]
   },
   "entities": [
    {
     "type": "line",
     "start": {
      "at": [
       5.0,
       0.0
      ]
     },
     "end": {
      "at": [
       40.0,
       0.0
      ]
     },
     "id": "l1"
    },
    {
     "type": "line",
     "start": {
      "ref": "l1.end",
      "at": [
       40.0,
       0.0
      ]
     },
     "end": {
      "at": [
       40.0,
       -3.0
      ]
     },
     "id": "l2"
    },
    {
     "type": "line",
     "start": {
      "ref": "l2.end",
      "at": [
       40.0,
       -3.0
      ]
     },
     "end": {
      "at": [
       33.0,
       -8.0
      ]
     },
     "id": "l3"
    },
    {
     "type": "line",
     "start": {
      "ref": "l3.end",
      "at": [
       33.0,
       -8.0
      ]
     },
     "end": {
      "at": [
       33.0,
       -12.0
      ]
     },
     "id": "l4"
    },
    {
     "type": "line",
     "start": {
      "ref": "l4.end",
      "at": [
       33.0,
       -12.0
      ]
     },
     "end": {
      "at": [
       40.0,
       -17.0
      ]
     },
     "id": "l5"
    },
    {
     "type": "line",
     "start": {
      "ref": "l5.end",
      "at": [
       40.0,
       -17.0
      ]
     },
     "end": {
      "at": [
       40.0,
       -23.0
      ]
     },
     "id": "l6"
    },
    {
     "type": "line",
     "start": {
      "ref": "l6.end",
      "at": [
       40.0,
       -23.0
      ]
     },
     "end": {
      "at": [
       33.0,
       -28.0
      ]
     },
     "id": "l7"
    },
    {
     "type": "line",
     "start": {
      "ref": "l7.end",
      "at": [
       33.0,
       -28.0
      ]
     },
     "end": {
      "at": [
       33.0,
       -32.0
      ]
     },
     "id": "l8"
    },
    {
     "type": "line",
     "start": {
      "ref": "l8.end",
      "at": [
       33.0,
       -32.0
      ]
     },
     "end": {
      "at": [
       40.0,
       -37.0
      ]
     },
     "id": "l9"
    },
    {
     "type": "line",
     "start": {
      "ref": "l9.end",
      "at": [
       40.0,
       -37.0
      ]
     },
     "end": {
      "at": [
       40.0,
       -40.0
      ]
     },
     "id": "l10"
    },
    {
     "type": "line",
     "start": {
      "ref": "l10.end",
      "at": [
       40.0,
       -40.0
      ]
     },
     "end": {
      "at": [
       5.0,
       -40.0
      ]
     },
     "id": "l11"
    },
    {
     "type": "line",
     "start": {
      "ref": "l11.end",
      "at": [
       5.0,
       -40.0
      ]
     },
     "end": {
      "ref": "l1.start",
      "at": [
       5.0,
       0.0
      ]
     },
     "id": "l12"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "revolve",
   "name": "Revolve1",
   "operation": "new",
   "profile": {
    "sketch": "Profile",
    "loops": [
     {
      "outer": true,
      "curves": [
       "l1",
       "l10",
       "l11",
       "l12",
       "l2",
       "l3",
       "l4",
       "l5",
       "l6",
       "l7",
       "l8",
       "l9"
      ]
     }
    ]
   },
   "axis": {
    "ref": "world Z axis",
    "origin": [
     0,
     0,
     0
    ],
    "dir": [
     0,
     0,
     1
    ]
   },
   "angle": 360,
   "result_bodies": [
    "Pulley"
   ]
  }
 ]
}