This is a hands-on educational reconstruction inspired by the ETA/Unitas 6498-1. The parts are deliberately legible, and the train is mathematically connected. It is not a measured replica or a repair manual.
ETA’s 6498-1 technical communication, 6 May 2025 supplies the architecture, parts and service relationships, 36.6 mm diameter, 4.5 mm height, 2.5 Hz frequency and 17-jewel specification. It lists 46 h minimum and 52 h typical reserve. This model chooses a represented capacity of 46 h.
Tooth counts, exact outlines, dimensions, pivot coordinates, bearing details and layer thicknesses are reconstructed. Gear profiles and train layout are adapted from your Movement designer’s hand-wound example. Recesses, stepped arbors, jewel bores, locating sockets and nested dial pipes are consistent design geometry rather than measured ETA parts. On the original bench, the balance and cock are one service subassembly; winding works stay with the barrel bridge, and dial-side motion works stay installed.
The 2.5 Hz balance gives five beats per second; two beats advance one full escape-wheel tooth. The two geometric half releases are slightly asymmetric. Pointed teaching teeth and pallet faces follow a sampled geometric contact curve through lock, unlock, impulse and drop. This is not ETA’s exact club-tooth profile, and contact forces or impulse energy are not solved. Fixed drawn amplitude is not a health measurement. No real torque, friction, lubrication or timekeeping is inferred from this movement. Design lab provides separate bounded calculations with illustrative inputs.
Drag to orbit, right-drag to pan and scroll to zoom. With the viewport focused, use arrows to orbit, Shift + arrows to pan and + / − to zoom. F inspects the selection, R resets the camera, Space pauses and period advances one beat. Use the component list and Remove / Install buttons for precise, keyboard-accessible snapping. Ctrl Z / Ctrl Shift Z undo and redo.
Neutral inspection and Photographic lights reveal different surface reflections. Isolate selection hides other real service groups without altering assembly state. Assembly and lessons save locally on this browser and port. Reload resumes paused. No offline power drain. Reset bench clears only this bench’s state.
Three deliberately limited cases teach absent power, broken transmission and a blocked oscillator. Real movement diagnosis often needs measurements and cannot be reduced to visual inspection.
Nine separate detailed teaching assemblies add individually serviceable keyless and spring parts, seconds/barrel/support comparisons, automatic/oscillator/calendar views, seven quantitative tools and nine saved design challenges. Inputs and prescribed deformation are explicitly distinguished from measurements. The original courses and saved bench remain available. See the engineering methods and source record.
Deferred: measured reproduction geometry, validated three-dimensional contact/forces, nonlinear spring models, real rate diagnostics and manufacturing exports.