{
  "id": 20134156,
  "title": "Detect 5-Axis Rotary Reversals Before They Become Surface Marks",
  "url": "https://urgent.news/2026/11/15/detect-5-axis-rotary-reversals-before-they-become-surface-marks",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-15T07:23:46.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/tao2018/detect-5-axis-rotary-reversals-before-they-become-surface-marks-4115"
  },
  "original_language": "en",
  "account": "A Python script analyzes rotary axis reversals in a toolpath to potentially detect surface marks. It compares linear speed and rotary velocity changes at each sample point. When the linear speed drops below a threshold and rotary velocity changes sign, a reversal is flagged for further analysis. The script does not modify the toolpath or machine motion. The reversal_candidates function returns timestamps and details of flagged axis reversals. Engineers should examine contact geometry, axis limits and actual surface conditions at flagged timestamps, not assume a good part from unflagged timestamps. The script tests synthetic data showing how it identifies potential surface marks during rotary axis reversals.",
  "summary": "A collision check answers an important question: does the modeled tool assembly intersect the modeled part, fixture or machine envelope? It does not answer a different question: will the cutting contact remain stable while the rotary axes change direction? A short surface witness line can appear near an A- or C-axis reversal even when simulation reports no collision. Possible contributors include…",
  "key_points": [
    "Python script analyzes rotary axis reversals in toolpath",
    "Flags reversals when linear speed drops and rotary velocity changes sign",
    "Engineers examine contact geometry and surface conditions at flagged timestamps"
  ],
  "editors_take": "Automating the identification of rotary axis reversals shifts the burden of quality control from manual inspection to algorithmic detection, allowing engineers to focus on critical contact geometry issues.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}