{
  "schemaVersion": 1,
  "slug": "cam-follower-rise-dwell-return",
  "ownerPath": "/templates/cam-follower-rise-dwell-return",
  "semanticKey": "surface contact drives a guided roller through rise dwell return without a connecting rod",
  "demand": {
    "type": "independent-product-lookup-value",
    "historicalExactQuery": null,
    "exactSearchVolume": null,
    "rationale": "Plan a single cam action where a guided follower changes height because the supporting contour changes. The important interval is the high dwell: the cam keeps turning while the follower briefly stays at nearly the same height. This is a visual timing brief for an authored profile.",
    "status": "author-proposed; independent admission pending"
  },
  "input": "first-frame.png",
  "inputRoles": {
    "first-frame": "one authored PNG",
    "last-frame": null,
    "guide": "review only; do not upload"
  },
  "constraints": [
    "The hub and both vertical guides stay fixed.",
    "The same rigid cam profile turns; the lobe does not grow under a stationary mark.",
    "The roller rises only vertically as the rising flank arrives beneath it.",
    "During the high interval, the cam mark keeps moving while follower height changes little.",
    "The roller remains in contact during return without passing inside the cam.",
    "The stem stays between the guides and the ending retains the original roller attachment."
  ],
  "steps": [
    "Check that the first roller visibly meets the low contour. Keep the guide gap aligned with the roller center; a misplaced stem would introduce sideways movement before the main task.",
    "Request a turn that carries the rising flank, high arc and falling flank underneath the roller, then stop. State that the follower is kept against the contour; do not ask it to float independently.",
    "Inspect three intervals rather than only two heights: rising contact, turning during a near-constant high position, and return contact. A follower frozen for the entire shot is not a dwell."
  ],
  "nearestOwners": [
    "/templates/crank-slider-linked-stroke",
    "/templates/paired-gears-opposite-rotation"
  ],
  "substantiveDifference": "The crank-slider page transmits motion through a rigid rod with two pivots and explicitly stops before a reversal. This task needs direct rolling contact, a vertical guide and a high dwell between rise and return. It uses a different input and a different temporal test.",
  "modelExecution": {
    "performed": false,
    "taskId": null,
    "result": null,
    "paidCalls": 0
  },
  "sourceType": "original-local-deterministic-illustration",
  "rights": "Original authored geometry and prose; no third-party media. Independent review pending."
}