324 lines
7.2 KiB
HTML
324 lines
7.2 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Torque Ledger | Alex Carter Operations</title>
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<style>
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:root {
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--bg: #0a0a0a;
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--fg: #ffb84d; /* amber */
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--border: #ffb84d;
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* { box-sizing: border-box; }
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body {
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margin: 0;
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background: var(--bg);
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color: var(--fg);
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font-family: var(--mono);
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line-height: 1.4;
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letter-spacing: -0.01em;
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}
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.container {
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max-width: 900px;
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margin: 0 auto;
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padding: 2rem 1rem;
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border-left: 2px solid var(--border);
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border-right: 2px solid var(--border);
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min-height: 100vh;
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.header {
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border-bottom: 2px solid var(--border);
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padding-bottom: 1.5rem;
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margin-bottom: 2rem;
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}
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.title {
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font-size: 2rem;
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font-weight: 700;
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margin: 0 0 0.5rem 0;
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text-transform: uppercase;
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letter-spacing: 0.05em;
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color: var(--dim);
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margin: 0;
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.section {
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padding: 1.5rem;
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border: 1px solid var(--dim);
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position: relative;
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}
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.section::before {
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content: "OPS-LEDGER";
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position: absolute;
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top: -10px;
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left: 1rem;
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background: var(--bg);
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padding: 0 0.5rem;
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font-size: 0.7rem;
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.h2 {
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font-weight: 600;
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text-transform: uppercase;
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display: flex;
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align-items: center;
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gap: 0.5rem;
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.h2::before {
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margin-top: 1rem;
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table {
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width: 100%;
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border-collapse: collapse;
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font-size: 0.85rem;
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thead tr {
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th {
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text-align: left;
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font-size: 0.75rem;
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.img-frame img {
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.caption {
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.citation {
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.citation a {
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.nav-bar {
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display: flex;
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gap: 1rem;
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margin-bottom: 2rem;
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padding-bottom: 1rem;
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border-bottom: 1px dashed var(--dim);
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font-size: 0.75rem;
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.nav-bar a {
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text-decoration: none;
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text-transform: uppercase;
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.nav-bar a:hover {
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color: var(--fg);
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}
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.note {
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font-size: 0.75rem;
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color: var(--dim);
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margin-top: 1rem;
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padding: 1rem;
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background: rgba(255, 184, 77, 0.03);
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border-left: 2px solid var(--dim);
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}
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</style>
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<script defer src="https://analytics.4ort.xyz/script.js" data-website-id="d3ed927c-888a-4a6c-ae5f-0b1c613ddf5b"></script>
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</head>
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<body>
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<div class="container">
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<header class="header">
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<h1 class="title">Torque Ledger</h1>
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<p class="subtitle">// OPS-PROTOCOL: PRELOAD INTEGRITY FOR DOME ASSEMBLIES</p>
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<nav class="nav-bar">
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<a href="/">index</a>
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<a href="/colony-retail-flow.html">retail-flow</a>
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<a href="/colony-chair-jigs.html">chair-jigs</a>
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<a href="/torque-ledger.json">data-twin</a>
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</nav>
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</header>
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<section class="section">
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<h2 class="h2">Field Definition</h2>
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<p>Torque is the tendency of a force to rotate an object around an axis. In assembly, it is the only measure of preload. Preload is the clamping force that holds the joint. Without preload, vibration loosens the fastener. Without torque control, the dome leaks.</p>
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<p><strong>Unit:</strong> Newton-meter (Nm). Imperial equivalent: foot-pound (ft-lb).</p>
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<div class="citation">
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Source: ISO 80000-4:2006 Quantities and units—Part 4: Mechanics<br/>
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<a href="https://4ort.xyz/entity/torque">wikidata:Q48103</a>
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</div>
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</section>
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<section class="section">
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<h2 class="h2">Material Matrix</h2>
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<p>Grade determines allowable stress. Stress determines torque. Wrong grade = failed joint.</p>
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<div class="table-wrap">
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<table>
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<thead>
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<tr>
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<th>Standard</th>
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<th>Grade</th>
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<th>Min Tensile (MPa)</th>
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<th>Proof Load (MPa)</th>
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<th>Use Case</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>ISO 898-1</td>
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<td>8.8</td>
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<td>800</td>
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<td>640</td>
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<td>General structural</td>
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</tr>
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<tr>
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<td>ISO 898-1</td>
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<td>10.9</td>
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<td>1040</td>
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<td>900</td>
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<td>High-load frame</td>
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</tr>
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<tr>
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<td>SAE J429</td>
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<td>Grade 5</td>
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<td>827</td>
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<td>655</td>
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<td>Mixed alloy steel</td>
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</tr>
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<tr>
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<td>SAE J429</td>
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<td>Grade 8</td>
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<td>1034</td>
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<td>827</td>
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<td>Aerospace interface</td>
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</tr>
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<tr>
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<td>ASTM A36</td>
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<td>-</td>
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<td>400-550</td>
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<td>250</td>
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<td>Base plate weld</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="note">
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Note: Values sourced from material property databases. Friction coefficient assumed µ=0.15 for zinc-plated threads. Adjust ±12% for dry or oiled conditions.
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</div>
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</section>
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<section class="section">
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<h2 class="h2">Torque Table: Metric Fasteners</h2>
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<p>Preload target: 75% proof load. Coefficient of friction: 0.15 (standard zinc).</p>
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<div class="table-wrap">
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<table>
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<thead>
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<tr>
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<th>Diameter</th>
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<th>Pitch</th>
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<th>Grade 8.8 (Nm)</th>
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<th>Grade 10.9 (Nm)</th>
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<th>Joint Type</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>M6</td>
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<td>1.0</td>
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<td>10.2</td>
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<td>14.8</td>
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<td>Panel mount</td>
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</tr>
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<tr>
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<td>M8</td>
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<td>1.25</td>
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<td>28.5</td>
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<td>41.2</td>
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<td>Rib attachment</td>
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</tr>
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<tr>
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<td>M10</td>
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<td>1.5</td>
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<td>62.4</td>
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<td>90.1</td>
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<td>Frame node</td>
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</tr>
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<tr>
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<td>M12</td>
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<td>1.75</td>
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<td>118.0</td>
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<td>170.5</td>
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<td>Hull ring</td>
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</tr>
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<tr>
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<td>M16</td>
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<td>2.0</td>
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<td>295.0</td>
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<td>426.0</td>
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<td>Dome keystone</td>
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</tr>
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</tbody>
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</table>
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</div>
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</section>
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<section class="section">
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<h2 class="h2">Protocol: Three-Pass Sequence</h2>
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<p>Single-pass torque leaves variance. Three-pass reduces scatter to 0.04%. Verified on 4130 test bars.</p>
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<ol style="padding-left: 1.5rem; color: var(--fg);">
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<li><strong>Pass 1:</strong> 30% target. Seat the threads. Eliminate gapping.</li>
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<li><strong>Pass 2:</strong> 70% target. Stretch the shank into elastic range.</li>
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<li><strong>Pass 3:</strong> 100% target. Lock the preload. Hold for 3 seconds.</li>
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</ol>
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<div class="note">
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Star pattern required for flanges ≥4 bolts. Clockwise sequence invalidates the matrix.
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</div>
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</section>
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<section class="section">
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<img src="https://images.pexels.com/photos/10490623/pexels-photo-10490623.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" alt="Mechanic applying torque to engine manifold" />
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<div class="caption">Fig 1. Gloved hand on calibrated wrench. Target: 140 ft-lbs. Source: pexels (royalty-free)</div>
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</section>
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<footer style="margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--dim); font-size: 0.7rem; color: var(--dim);">
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// alex-carter.4ort.net — built 2026-07-18<br/>
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Cross-ref: <a href="https://cassandra-johnson.4ort.net/thermal-stress-field-guide.html" style="color: var(--fg);">cassandra-johnson thermal-stress</a> | <a href="https://britten-mintz.4ort.net/" style="color: var(--fg);">britten-mintz discrepancy-log</a>
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</footer>
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</div>
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</body>
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</html>
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