Editing Openai/68fceef0-7248-8013-bf5d-581461dec5bc (section)

=== Assistant: THEMS Drum–Pinion Calculator — index.html PART 2/10 ===
THEMS Drum–Pinion Calculator — <code>index.html</code> (PART 2/10)
(continuation — paste directly after previous block)

<syntaxhighlight lang="html">        <div class="field" style="grid-column:span 6">
          <label>Pitch Mode</label>
          <select id="pitchMode">
            <option value="module" selected>Module (metric entry)</option>
            <option value="dp">Diametral Pitch (DP)</option>
          </select>
          <small>DP or Module required; pinion radius derived from pitch + teeth.</small>
        </div>

        <div class="field" style="grid-column:span 3" id="moduleField">
          <label>Module m (mm)</label>
          <input id="module" type="number" min="0.1" step="0.01" value="1.00" />
          <small>Auto-converts to DP for display.</small>
        </div>

        <div class="field" style="grid-column:span 3;display:none" id="dpField">
          <label>Diametral Pitch (1/in)</label>
          <input id="dp" type="number" min="1" step="0.01" value="25.40" />
          <small>Auto-converts to Module for display.</small>
        </div>

        <div class="field" style="grid-column:span 6">
          <label>Pinion Teeth z</label>
          <input id="teeth" type="number" min="6" step="1" value="20" />
          <small>Used with DP or Module to size pinion & drums.</small>
        </div>

        <div class="field" style="grid-column:span 4">
          <label>Primary Weight W<sub>p</sub> (lb)</label>
          <input id="wPrimary" type="number" min="0" step="0.1" value="40" />
        </div>

        <div class="field" style="grid-column:span 4">
          <label>Secondary Weight W<sub>s</sub> (lb)</label>
          <input id="wSecondary" type="number" min="0" step="0.1" value="20" />
          <small>Enforced: W<sub>s</sub> &lt; W<sub>p</sub>.</small>
        </div>

        <div class="field" style="grid-column:span 4">
          <label>Assembly Weight (lb)</label>
          <input id="wAssembly" type="number" min="0" step="0.1" value="5" />
          <small>Only one quadrant modeled → contributes (weight ÷ 4).</small>
        </div>

        <div class="field" style="grid-column:span 4">
          <label>Bearing / Rolling Efficiency η<sub>bearing</sub></label>
          <input id="etaBearing" type="number" min="0.9" max="1" step="0.001" value="0.99" />
          <small>High-precision default 0.99.</small>
        </div>

        <div class="field" style="grid-column:span 4">
          <label>Mesh Efficiency η<sub>mesh</sub> <span class="muted">(Advanced)</span></label>
          <input id="etaMesh" type="number" min="0.85" max="1" step="0.001" value="0.99" />
          <small>Rack–pinion tooth contact efficiency (0.85–1.00). Default 0.99.</small>
        </div>

</syntaxhighlight>

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