{
  "object_id": "c10-pad-envelope",
  "type": "authored_teaching_geometry",
  "units": "mm",
  "reference": "plan view, fixed lower pad centered at x=0; upper plate moves relative to it",
  "geometry": {
    "upper_length": 210,
    "lower_length": 100,
    "displacements": [
      -40,
      0,
      40
    ],
    "required_edge_coverage": 12.7,
    "upper_width": 70,
    "lower_width": 50,
    "orthogonal_check": "not evaluated"
  },
  "method": "minimum_edge_coverage=(upper_length-lower_length)/2-abs(displacement)",
  "results": [
    {
      "x": -40,
      "minimum_edge_coverage": 15
    },
    {
      "x": 0,
      "minimum_edge_coverage": 55
    },
    {
      "x": 40,
      "minimum_edge_coverage": 15
    }
  ],
  "limitations": [
    "Hypothetical dimensions, not source catalogue geometry",
    "Longitudinal protective overlap only; bearing pressure,bond,temperature,capacity,tolerances and orthogonal travel not accepted",
    "Margin adopted from separate conditional PTFE pad procedure; not universal"
  ]
}