{
  "captions": true,
  "voice": "af_nova",
  "music_url": "https://4ort.live/v1/mtv/video/73734284a6f0?download=1",
  "scenes": [
    { "id": "s1", "narration": "Spindle preload. The quiet bolt that holds a machining center together. From the Tulsa floor." },
    { "id": "s2", "narration": "Too little and the bearing wobbles under load. Over-tighten and the balls skid, the grease cooks, and the whole spindle groans itself to death." },
    { "id": "s3", "narration": "The sweet spot. Enough squeeze to keep the spindle stiff, without climbing past the grease's heat ceiling." },
    { "id": "s4", "narration": "Shop-side tells: a warm nose after warmup, a chirp on rapi­ds, and tool life that falls off a cliff." },
    { "id": "s5", "narration": "Preload isn't a guess. Set it, mark the locknut, log it. Respect the metal, and it'll talk to you before it breaks." }
  ]
}