{
  "title": "The Grandfather Workbench",
  "built": "1924",
  "verified_by": "Austin Danos",
  "verification_date": "2023-11-15",
  "location": "Slingerlands, NY",
  "specifications": {
    "top_slabs": {
      "material": "Hard Maple (Acer saccharum)",
      "dimensions": "4\" thick × 24\" wide × 8' long",
      "tolerance": "±0.003\"",
      "moisture_content": "8%"
    },
    "legs": {
      "material": "White Oak (Quercus alba)",
      "dimensions": "6\" × 6\" square",
      "tolerance": "±0.005\""
    },
    "aprons": {
      "material": "White Oak",
      "dimensions": "4\" × 8\" rectangular",
      "tolerance": "±0.003\""
    },
    "corners": {
      "material": "Cast Iron",
      "dimensions": "3\" × 3\" × 1/2\" plates",
      "finish": "Machined"
    },
    "joinery_pegs": {
      "material": "Hickory (Carya ovata)",
      "dimensions": "3/4\" diameter × 4\" length",
      "fit": "Press-fit (+0.002\")"
    }
  },
  "joinery_details": {
    "mortise": {
      "depth_inches": 3.0,
      "width_inches": 1.0,
      "taper_degrees": 1,
      "wall_parallelism_tolerance": "±0.001\""
    },
    "tenon": {
      "length_inches": 2.9,
      "cheek_deviation": "0.0005\"",
      "shoulder_square": "Verified by try-square"
    },
    "peg": {
      "diameter_inches": 0.752,
      "moisture_content_percent": 8,
      "drive_force_method": "Calculated per thermal stress model"
    }
  },
  "thermal_expansion_coefficients": {
    "hard_maple_per_F": 0.000032,
    "white_oak_per_F": 0.000028,
    "black_walnut_per_F": 0.000024,
    "eastern_white_pine_per_F": 0.000019
  },
  "modulus_of_rupture_psi": {
    "hard_maple": 1800000,
    "white_oak": 1600000,
    "black_walnut": 1400000,
    "eastern_white_pine": 1100000
  },
  "density_lb_per_cubic_inch": {
    "hard_maple": 0.044,
    "white_oak": 0.047,
    "black_walnut": 0.041,
    "eastern_white_pine": 0.028
  },
  "formula": {
    "expansion": "ΔL = L₀ × α × ΔT",
    "stress": "σ = E × ε",
    "strain": "ε = ΔL / L₀",
    "source": "ASTM D143-20 Standard Test Methods for Small Clear Specimens of Timber"
  },
  "safety_factor": 3,
  "quote": {
    "text": "A workbench is not furniture. It is the extension of your arms. If it moves when you strike, you have already lost.",
    "author": "Joseph Danos",
    "year": 1924
  },
  "related_pages": [
    "https://austin-danos.4ort.net/grandfather-tools.html",
    "https://austin-danos.4ort.net/dovetail.html",
    "https://austin-danos.4ort.net/prevention-ledger.html"
  ]
}