Turn a pinion and advance one straight rack

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

1. Task and boundary

Show one toothed wheel turning on its fixed axle while a meshing straight rack advances along a guide. The useful event is the changing engagement between individual teeth: wheel rotation and rack travel must occur together, then stop together without the rack lifting away.

Use an exposed rack and pinion in your authorized input. Exclude a second gear, belt, screw drive or hidden motor. This untested plan reviews visible coupling, not a mechanical simulation.

2. Authorized first frame

Prepare a photograph or accurate drawing you own or have permission to use. Show the wheel above a horizontal rack, with its lower teeth already meshing. Include the axle, both guide edges and enough unused rack length on the left for a short rightward stroke.

Choose a nearly frontal view with shallow depth, large readable teeth and no decorative print. A small existing wheel mark and one distinct rack tooth help track identity. Keep the guide supports and a background corner visible. If the actual arrangement is reversed, reverse the motion wording before submission rather than changing the hardware.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the prompt; check settings and cost before submission. Nothing runs automatically.

4. Prompt and timing

Start from my authorized image of one exposed pinion above a horizontal straight rack, already meshed inside a fixed guide. Lock the camera, lighting, axle and guide supports. Turn the original pinion counterclockwise through a modest partial rotation. At the lower contact region, its teeth move toward the right and advance the same rack smoothly to the right along the guide. Show successive tooth engagement without teeth passing through each other, merging or jumping across a gap. Preserve the original wheel diameter, rack tooth spacing and guide alignment. Track the existing wheel mark and recognizable rack tooth; do not replace either part with a spinning texture. Keep the rack horizontal, with no vertical lift, sideways escape or bending. Begin both motions together, then stop both while teeth remain engaged. Hold that new position. No second wheel, belt, hand, motor cover, camera movement, cut, labels or additional motion cycle.

1. Establish, first fifth: locate the axle, guide and two tracking features before any motion.
2. Drive, middle three fifths: follow early, middle and late tooth engagements as the rack advances rightward.
3. Hold, final fifth: stop the wheel and rack in a new engaged position; retain enough rack inside the guide.

5. Inspect the output

For each check, record a frame or time, observation and pass, fail or inconclusive judgment.

• The axle and guide supports remain fixed against the background throughout the stroke.
• The wheel mark rotates while the rack feature translates; neither merely changes surface texture.
• At the lower contact, counterclockwise wheel motion accompanies rightward rack travel in this arrangement.
• Successive teeth enter and leave engagement continuously without visibly overlapping solid material.
• Rack height and orientation stay consistent, and both parts stop without losing engagement.
• Blur or a hidden contact region makes engagement inconclusive; a correct ending alone is insufficient.

6. Fix one failure

• The rack moves backward: check which side touches the wheel, then correct the coupled direction in the prompt.
• Teeth dissolve into a blur: reduce the requested stroke and use larger visible teeth in the authorized input.
• The axle slides with the rack: repeat the fixed axle and guide anchors; remove camera tracking language.
• The rack lifts or bends: make both straight guide boundaries visible and shorten the travel.
• The wheel stops first: request a shared stop with teeth engaged, then review the final transition separately.

7. Ending and limits

Finish with the same wheel and rack at rest, still meshed inside the original guide.

Save your result, authorized input, exact prompt, settings and inspection notes.

No H3 run, gear-profile validation, travel ratio, torque estimate or backlash measurement is supplied. Visible coupling cannot establish engineering tolerances or suitability for a real load.

The two-gear task keeps both centers fixed while two wheels rotate. Here one fixed-axis wheel drives a separate straight translation constrained by a guide. Changing tooth color or rack length alone would remain this task.