{
  "schema_version": "1.0",
  "rubrics": [
    {
      "id": "R1",
      "requirement": "The model shall be an assembly containing exactly eight resolved, unsuppressed components: column, bearing, crankshaft, flywheel, cylinder, piston, washer and nut."
    },
    {
      "id": "R2",
      "requirement": "The model's column part shall be a revolved body 66.67 mm (2.625 in) tall with a Ø34.92 mm base ring and a 1.27 x 45° chamfer."
    },
    {
      "id": "R3",
      "requirement": "The model's column shall include flats and cross-hole cut features."
    },
    {
      "id": "R4",
      "requirement": "The model's bearing shall be a flanged bushing 17.46 mm long with a Ø9.53 mm flange, a Ø7.94 mm shank and a Ø4.76 mm through bore."
    },
    {
      "id": "R5",
      "requirement": "The model's crankshaft shall have a half-disc web of Ø17.46 mm, a crank pin, and a main shaft of Ø4.76 mm x 31.75 mm."
    },
    {
      "id": "R6",
      "requirement": "The model's flywheel shall be Ø31.75 mm x 7.94 mm with a Ø4.76 mm bore, mirrored Ø22.23 mm face recesses, mirrored Ø9.53 mm hub bosses and a radial set-screw hole."
    },
    {
      "id": "R7",
      "requirement": "The model's cylinder shall have an octagonal body 28.58 mm long with a Ø9.53 mm bore and an integral rod."
    },
    {
      "id": "R8",
      "requirement": "The model's piston shall have a revolved head and rod with a 6.35 mm clevis block containing a cross pin hole, 38.1 mm overall along the rod axis."
    },
    {
      "id": "R9",
      "requirement": "The model's washer shall be Ø0.406 in OD x Ø0.141 in ID x 0.045 in thick."
    },
    {
      "id": "R10",
      "requirement": "The model's nut shall be a hex 0.312 in (7.92 mm) across flats and 0.114 in thick, with a Ø1/8 in bore and a 30° corner chamfer on both sides."
    },
    {
      "id": "R11",
      "requirement": "The model's assembled envelope shall be approximately 67.64 mm by 43.66 mm in the top/front view directions."
    },
    {
      "id": "R12",
      "requirement": "The model shall have the column component fixed and all other components positioned by mates."
    },
    {
      "id": "R13",
      "requirement": "The model shall use concentric, coincident and tangent mates, with no mate errors."
    },
    {
      "id": "R14",
      "requirement": "The model's part features and sketches shall carry descriptive names, e.g. 'Flanged Bushing Body' and 'Main Shaft Ø0.1875'."
    },
    {
      "id": "R15",
      "requirement": "The model's parts shall each have a steel material assigned."
    },
    {
      "id": "R16",
      "requirement": "The model's parts and assembly shall each carry Description, PartNo and Material custom properties."
    }
  ]
}