{
  "task": "Model a six-blade twisted-tooth pinion shaft with splined end",
  "domain": "CAD",
  "application": "CATIA V5",
  "description": "Build a single solid part of a spiral-type pinion shaft as shown in the supplied dimensioned diagrams. These are diagram_01.png, the overall sheet with top, front, right side and isometric views, and its enlargements diagram_01_detail01.png to diagram_01_detail04.png. All dimensions are in millimetres. The views are in third-angle projection.\n\nThe part is a straight shaft with one rotational axis. From the head end to the tail end it has the following sections:\n\n1. Head: a domed, bell-shaped head carrying six identical twisted blades (teeth). The blades are spaced evenly at 60° around the axis. Each blade sweeps helically along the curved conical profile, which tapers toward the flat end face of the head.\n2. Collar: a thin flange directly behind the blade root.\n3. Bearing journal: a cylindrical journal of R39.\n4. Step and neck: a short shoulder step, then a necked section with a concave circumferential groove of rounded profile.\n5. Spline: a splined section with straight, rectangular axial teeth spaced evenly around the circumference.\n6. Tail: a plain cylindrical end spigot with a flat end face.\n\nKey dimensions:\n\n- Overall length along the axis: 253.\n- Blade tip envelope in the front view: 170 across the tips horizontally and 154.72 vertically.\n- Radii called out in the front view: R45 for the collar/hub circle and R39 for the journal.\n\nTake the remaining proportions (section lengths, spline tooth size, groove profile) from the views in the supplied diagrams.\n\nModel the part as one CATPart.\n\n- Build the revolved shaft body from a sketched profile about a single axis.\n- Add the blades as one blade feature repeated with a circular pattern of six instances.\n- Create the spline teeth as a circular pattern of one tooth.\n- Keep the feature tree named and ordered logically: shaft body, blades, spline, groove.\n\nSave the work as a single native CATPart file.",
  "input_files": [
    "task_files/diagrams/diagram_01.pdf",
    "task_files/diagrams/diagram_01.png",
    "task_files/diagrams/diagram_01_detail01.png",
    "task_files/diagrams/diagram_01_detail02.png",
    "task_files/diagrams/diagram_01_detail03.png",
    "task_files/diagrams/diagram_01_detail04.png"
  ],
  "deliverables": [
    {
      "path": "output_files/project_files/2D_Engineering_Drawing_of_a_Six-Blade_Axial_Fan_Impeller_with_Central_Hub_and_Twisted_Blades_in_CATIA.CATPart",
      "type": "native_project_or_dependency",
      "format": ".catpart",
      "description": "A single native CATIA V5 CATPart containing the feature-based model of the six-blade pinion shaft with collar, journal, grooved neck, spline and end spigot."
    },
    {
      "path": "output_files/project_files/2D_Engineering_Drawing_of_a_Six-Blade_Axial_Fan_Impeller_with_Central_Hub_and_Twisted_Blades_in_CATIA.igs",
      "type": "native_project_or_dependency",
      "format": ".igs",
      "description": "IGES export of the model in the same units."
    }
  ]
}