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