{
  "schema_version": "1.0",
  "rubrics": [
    {
      "id": "R1",
      "requirement": "The model shall consist of a single solid body."
    },
    {
      "id": "R2",
      "requirement": "The model shall have an overall extent of 272 mm by 271.63 mm in the sprocket plane."
    },
    {
      "id": "R3",
      "requirement": "The model shall have an overall thickness of 40 mm measured across the hub boss."
    },
    {
      "id": "R4",
      "requirement": "The model shall have a cylindrical hub boss of outer radius R40 projecting beyond both faces of the toothed plate."
    },
    {
      "id": "R5",
      "requirement": "The model shall have a central through bore of radius R30 in the hub boss."
    },
    {
      "id": "R6",
      "requirement": "The model shall have chain teeth with rounded roots around the full periphery of the plate."
    },
    {
      "id": "R7",
      "requirement": "The model shall have five lightening through-cutouts in the web, with rounded corners dimensioned R9.5."
    },
    {
      "id": "R8",
      "requirement": "The model shall have five round through-holes arranged around the hub boss."
    },
    {
      "id": "R9",
      "requirement": "The model shall be built entirely from planar and cylindrical faces."
    },
    {
      "id": "R10",
      "requirement": "The drawing shall contain labelled front, side and isometric views."
    },
    {
      "id": "R11",
      "requirement": "The drawing shall dimension the front view with R40, R9.5 and the Ø60 (R30) bore."
    },
    {
      "id": "R12",
      "requirement": "The drawing shall dimension the 40 overall thickness."
    },
    {
      "id": "R13",
      "requirement": "The drawing shall have a title block with a title, a drawing number and size A1, and state that dimensions are in millimetres."
    },
    {
      "id": "R14",
      "requirement": "The model shall be saved as part file SPROCKET_WHEEL.prt in millimetre units."
    },
    {
      "id": "R15",
      "requirement": "The drawing shall be held in a separate part file SPROCKET_WHEEL_dwg1.prt whose views reference the SPROCKET_WHEEL model."
    }
  ]
}