Technical sheet
The 2824-2 with a day disc: self-winding, 4 Hz, day and date at 3.
Features
Going train
| Arbor | Wheel | Pinion | True speed |
|---|---|---|---|
| Mainspring barrel | 84 | — | 1 rev / 7 hours |
| Center wheel | 80 | 12 | 1 rev / hour |
| Third wheel | 75 | 10 | 8 rev / hour |
| Fourth (seconds) wheel | 84 | 10 | 1 rev / minute |
| Escape wheel | 20 | 7 | 12 rev / minute |
Disclaimer
An approximation of the ETA 2836-2 layout from public drawings and photographs, not a manufacturer-accurate replica. The caseback is that of the 2824-2 base, which the 2836-2 shares. Bidirectional automatic winding, 28,800 vph (4 Hz), 25 jewels, Ø 25.60 mm (11½ lignes), 5.05 mm height (0.45 mm more than the 2824-2, for the day disc), day and date in a window with quick correction, and stop-seconds are published ETA figures. ETA describes the 2836-2’s day-date change as “instantaneous” but the 2824-2’s date change as “semi-instantaneous”; ETA’s wording is kept for each caliber, and it was not independently verified. Power reserve: 38 h in ETA’s technical sheets, 42 h typical on ETA’s product page. Tooth counts, wheel sizes, the barrel position, the bridges hidden under the rotor, the seconds drive and the day-disc layout (day star and jumper positions were not found) are an approximation. Parts are drawn larger than life for legibility and the stack is taller than the real 5.05 mm. The escapement motion is a kinematic model, not a physics simulation.
Sources