{
  "abstract": "This disclosure describes an arrangement for monitoring the preload of mounting bolts securing a slewing ring. The system utilizes a subset of load-sensing washers integrated with select bolts to measure axial clamping force. By acquiring and analyzing these preload signals over time, the system can detect progressive bolt loosening, which, if unaddressed, can lead to uneven load distribution and eventual structural failure of the slewing ring. Early detection of preload degradation enables proactive maintenance, ensuring the continued structural integrity and safe operation of the assembly.",
  "canonical_url": "https://opentechnical.org/p/OT-2026-000000044",
  "categories": [
    "industrial-motion-power-transmission/rotary-motion/slewing-rings",
    "sensors-controls-machine-vision/force-and-pressure-sensing/load-cells"
  ],
  "extent": {
    "figures": 3,
    "paragraphs": 18,
    "words": 2316
  },
  "figures": [
    {
      "caption": "A block diagram illustrating the primary components and data flow of the bolt preload monitoring system.",
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        "file": "figures/fig-001.png",
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      "number": "FIG-001",
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    {
      "caption": "An elevation view showing a conceptual arrangement of a load-sensing washer integrated into a slewing ring mounting.",
      "derivative": {
        "file": "figures/fig-002.png",
        "media_type": "image/png",
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    {
      "caption": "A conceptual representation of preload over time, showing a stable state, a decreasing trend, and an alert threshold.",
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  "keywords": [
    "slewing ring",
    "bolt preload",
    "load-sensing washer",
    "structural integrity",
    "rotary motion",
    "bolt loosening",
    "condition monitoring",
    "fastener",
    "torque retention"
  ],
  "language": "en",
  "license": {
    "name": "Creative Commons Attribution 4.0 International",
    "url": "https://creativecommons.org/licenses/by/4.0/"
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  "publication_id": "OT-2026-000000044",
  "published_at": "2026-09-15T11:45:33.452725Z",
  "publisher": "Nebula Innovations Limited",
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  "supersedes": null,
  "title": "Slewing Ring Bolt Preload Monitoring System Using Load-Sensing Washers",
  "uuid": "01a0a4e2-f908-73d4-87d5-8f29b904e439"
}