Close a caliper on one block: stop when both jaws touch

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

1. Task and boundary

The task is a single approach to contact. A small rectangular block already rests against the fixed outside-measuring jaw of an unbranded caliper. The other jaw slides along the beam toward the opposite block face, slows as its gap closes and stops at contact. The block stays supported and unchanged. This provides a useful distinction between an object becoming enclosed by a moving tool and the object shrinking to fit a tool that did not move correctly.

Use only the two large outside jaws. Keep the depth rod and smaller inside jaws out of the main action, and do not ask for a scale reading. The demonstration ends with visible opposed contacts, not a certified dimension, clamping force or proof that a real instrument has been calibrated. A clear gap closing in one view is the intended visual result.

2. Authorized first frame

Prepare your own photograph or original diagram, or an image you are authorized to adapt. Show the caliper beam approximately horizontal, the fixed jaw at frame left and the sliding jaw to its right. Place one plain rectangular block between them with its left face already touching the fixed jaw. Leave a modest visible gap at the right face. Support the block on a stationary flat surface.

Choose a slightly oblique side view that reveals both inner jaw faces and the block edges without perspective hiding the right gap. The moving jaw carriage must be visibly attached to the beam. A hand can hold the body and a second fingertip can contact the existing carriage thumb pad, but neither should cover the two contact regions. Use a blank or indistinct scale rather than readable measurement digits. Leave room for the entire short slide, without inventing a new length of beam.

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 block, supporting surface, caliper beam and fixed left jaw stationary. Keep the block left face in contact with the fixed jaw. A fingertip slowly pushes the existing sliding-jaw carriage along the beam toward the block. Preserve the carriage connection and the orientation of both opposed jaw faces. Close the right gap continuously, slowing before contact. Stop when the moving jaw inner face meets the block right face. Keep the block shape and width unchanged, with no compression, lift or sideways escape. Do not let either jaw pass through the block or continue moving after contact. Hold both contacts briefly under the same light touch. Do not add a measurement readout, jaw locking action, release cycle or camera move.

Opening: identify the fixed left contact, the open right gap, the carriage on the beam and the supported block before the fingertip begins to move.
Middle: move only the guided carriage and its jaw. Follow the shrinking right gap while checking that the block edges and the left contact remain in the same places.
Ending: slow the approach and stop at the second contact. Keep the same gentle operating touch and a short steady hold; do not introduce a locking screw or imply a hands-off clamp.

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 fixed jaw and beam remain stationary, while the moving jaw stays attached to the same carriage and follows the beam.
The left block face stays against the fixed jaw from the opening through the ending, without the block sliding to meet the approaching jaw.
The right gap closes continuously before contact, with a visible deceleration rather than an instantaneous jump to the final spacing.
The block preserves its rigid dimensions and support contact; neither jaw penetrates it or squeezes it into a thinner object.
Both opposed contacts remain visible in the ending under the same operating touch, without additional jaw travel or a newly invented lock.
If the contact faces are hidden, blurred or exactly edge-on, record inconclusive; a plausible jaw spacing alone does not establish two contacts.

6. Fix one failure

If the block shrinks, explicitly preserve its corners and width. Reduce the initial gap so the model need not redraw much of the beam or object.
If both jaws move, name the left jaw and beam as fixed together and the right carriage as the only sliding part. Use contrasting markers on those two assemblies.
If the carriage detaches, simplify the view to expose its channel around the beam. Avoid a hand covering the guide during the motion.
If the jaw crosses the right face, request a slower final approach and a pause at first contact. Do not repair penetration by making the block elastic.
If the apparent contact is unreadable, use a clearer authorized input angle or a diagram with larger gaps and faces. Recheck the approach after changing one instruction.

7. Ending and limits

The endpoint shows the same block between two opposed faces, with both gaps closed and the carriage stopped. The short hold keeps the same support and touch as the approach. No measurement value should be inferred from unlabeled marks, and the absence of visible penetration does not prove a real caliper is accurate.

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

No generated example, dimensional inspection or physical instrument test is supplied. Perspective and soft edges can hide a small residual gap, so use an uncertain judgment when the contact cannot be seen. Keep your source image, actual settings and inspection notes with the saved result. This brief does not replace practical metrology or establish product tolerances.

The crank-slider task couples rotation to a connected linear stroke. Here the carriage is moved directly and its endpoint is defined by two contacts on a separate rigid block. The useful comparison is guided motion, while the event being checked is contact closure rather than rotational transmission.