Follow one chain link onto and off a sprocket

Original, untested video brief. No input image or generated result is supplied.

1. Task and boundary

The action follows one marked link, not merely a spinning toothed outline. A roller chain approaches the top of one sprocket from frame left, wraps around its right side and leaves along the lower run toward frame left. A clockwise turn carries the marked link from the incoming straight section, through the wrap and onto the outgoing section. The useful evidence is the changing contact between the same rollers and successive tooth spaces while link order stays intact.

This is an exposed single-sprocket teaching view. The two chain runs continue beyond the frame, and the brief makes no claim about an unseen drive or a second shaft. Keep the visible runs lightly tensioned and already engaged in the first frame. Do not substitute a smooth belt, free-hanging decorative chain or closed two-pulley transmission. No exact tooth count, transmission ratio or torque measurement is requested.

2. Authorized first frame

Create an original diagram or use an authorized image of a roller chain matched to a clearly drawn sprocket. Show the full right-side wrap, both straight runs and the fixed hub. Use a front view that makes tooth spaces and roller centers readable. Mark one link on the upper incoming run just before the entry tangent, plus a recognizable neighboring link on either side. Keep these marks attached to their original parts.

The chain pitch must visibly fit the sprocket in the starting image; a prompt cannot reliably repair incompatible geometry. Leave enough upper and lower run in view for the marked link to enter and later emerge without leaving the frame immediately. Show plain stationary references behind the hub. Avoid tiny logos, heavy grease, motion blur or a guard covering the entry and exit. Your own simplified drawing is suitable if it retains separate rollers, side plates and pins.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the complete prompt, check the available settings and cost estimate, then submit only when ready. This page supplies text; it does not upload an image or start a generation.

4. Prompt and timing

Use the supplied first frame. Keep the sprocket hub and camera fixed. Turn the original sprocket clockwise slowly while the already engaged roller chain advances: the upper run moves right, around the right-side wrap and the lower run moves left. Track the existing marked link from just before the upper entry, around the wrap, then onto the lower outgoing straight section. Preserve every visible link connection, its two neighbors and the chain pitch. Let rollers seat between existing teeth as they enter, follow the same tooth spaces around the wrap, then disengage continuously at the lower tangent. Keep the straight runs taut without stretching links. Do not let teeth pass through rollers, let links skip pockets, change the wheel size or add a second sprocket. Slow the connected motion to a stop once the marked link is clearly on the lower straight run. Hold without reversing or cutting.

Opening: show the marked link approaching the upper tangent, the right-side engaged chain and both straight runs before the visible advance begins.
Middle: follow the link entering a tooth space, curving around the fixed hub with its neighbors, and leaving that space at the lower tangent. Keep the marked link identifiable through the wrap.
Ending: stop after the same link reaches the lower outgoing run. Keep the sprocket and chain stopped together with the original connections still visible.

These beats are author suggestions, not exact model timing guarantees. Adapt their proportions to the clip length actually available.

5. Inspect the output

After inspecting your own output, record a time or frame, visible observation and pass, fail or inconclusive judgment for each condition. A convincing ending alone does not verify the preceding action.

The hub remains fixed and the sprocket keeps its original tooth spacing and rigid outline while it turns clockwise.
The upper run advances right and the lower run advances left; the chain route through the right-side wrap remains continuous.
The marked link retains the same two neighbors and visible pin connections before entry, during the wrap and after exit.
Rollers enter spaces between teeth, remain seated through the engaged arc and leave at the lower tangent without crossing through solid teeth.
The link reaches the outgoing straight run before the shared stop, with no pitch stretching, skipped pockets or sudden reversal.
If the marked link disappears behind blur or cannot be distinguished from a replacement, record inconclusive even if the wheel and chain appear to move together.

6. Fix one failure

If the chain slides like a belt, enlarge the roller and tooth details in the input. Request distinct entry and exit events instead of generic smooth rotation.
If the marked link changes identity, reduce the speed and use one large contrasting mark. Keep its adjacent links visible rather than adding many similar colored markers.
If teeth pass through rollers, use a simpler authorized schematic with compatible pitch and a smaller visible advance before attempting the complete wrap.
If both straight runs move in the same direction, restate the clockwise wheel and the right-side wrap, with upper-right and lower-left travel as separate observations.
If the wheel changes size or the chain stretches, remove dramatic camera language and keep the hub, pitch and view fixed. Reinspect all three contact stages after one revision.

7. Ending and limits

The final marked link is on the lower straight run with its neighbors intact. The wheel has stopped at the same time as the visible chain. This ending alone cannot show how engagement happened, so retain observations from the entry tangent, wrapped arc and exit tangent rather than judging only the last frame.

Save your own generated result through the available result controls, together with the authorized input, exact prompt, settings and inspection notes.

No generated example, real chain test or measured drive efficiency is supplied. A diagram can make contact easier to read without proving working machinery. The unseen continuation of the runs is outside this shot; do not infer a complete drive layout. Preserve your authorized source and actual inspection notes when saving the result.

The interlocked-chain task checks changing bend while link order stays intact. This task adds indexed engagement with one toothed wheel and a marked link moving through two tangencies. It also differs from a two-pulley belt drive: the object of inspection here is entry, seating and release at teeth, not coupled shaft rotation.