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World Models and Simulation

English articles about world models and simulation at Physical AI Lab.

Oldham coupling offset: both sliding interfaces need an engagement check

Published: October 9, 2026 by Physical AI Lab

The same 6 mm offset magnitude consumed different perpendicular interfaces, while a 22 mm X shift withdrew one tongue and left the other centered.

Categories World Models and Simulation

Bevel-gear pitch cones: perpendicular axes can still miss the common apex

Published: October 8, 2026 by Physical AI Lab

All three cone pairs had approximately perpendicular axes, but only the matched pair shared an actual apex and corresponding finite generator.

Categories World Models and Simulation

Robot link cross-sections: equal area can hide different bending-axis geometry

Published: October 8, 2026 by Physical AI Lab

Equal cross-sectional area did not preserve the selected-axis area moments when rectangular link sections changed shape or orientation.

Categories World Models and Simulation

Cable drum calibration: winding radius changes length per turn

Published: October 8, 2026 by Physical AI Lab

The same recovered drum turn produced about 75.648 mm or 150.876 mm of modeled cable centerline length, depending on winding radius.

Categories World Models and Simulation

Ratchet pawl stop angles: a nearby tip does not prove tooth engagement

Published: October 8, 2026 by Physical AI Lab

Four sampled wheel-and-pawl poses were separated while two intersected, showing why wheel phase and pawl stop need independent finite-solid checks.

Categories World Models and Simulation

Bearing shoulder seating: the bore can fit while the shaft fillet holds the ring off the face

Published: October 8, 2026 by Physical AI Lab

The same nominal bore clearance produced shoulder contact, finite overlap, or an unsupported relieved gap depending on shaft fillet and axial position.

Categories World Models and Simulation

Dovetail slide assembly: can the insert be loaded from above?

Published: October 8, 2026 by Physical AI Lab

The same rigid dovetail insert fits when seated and remains clear during sampled end entry, yet intersects both retaining rails at the sampled top throat.

Categories World Models and Simulation

Cover hinge placement: the same closed fit can sweep through the enclosure lip

Published: October 8, 2026 by Physical AI Lab

An actual Blender comparison finds lip overlap in sampled edge-axis openings, while an offset axis keeps the same closed cover clear in all nine tested poses.

Categories World Models and Simulation

Linear actuator mounting: stroke does not settle arm angle or frame clearance

Published: October 8, 2026 by Physical AI Lab

Two actuator base pivots map the same pin-length range to different arm angles. Both sampled layouts still fail the finite barrel-clearance check.

Categories World Models and Simulation

Tool-side correction: same endpoint, different moving bodies

Published: October 8, 2026 by Physical AI Lab

Two static correction layouts reach the same tool-face endpoint. Moving only the carriage preserves upstream clearance; moving the whole assembly intersects a fixed guard.

Categories World Models and Simulation
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