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This is a genuine barrel bridge designed for the ETA 2824-2 automatic movement, with part number 2824-105, Made in Switzerland. The barrel bridge is a critical component of the movement‘s power source, supporting the central arbor of the barrel and ensuring smooth power transmission from the mainspring to the gear train.
As an original factory part, it is the ideal choice for replacing worn or damaged components during service or repair.
ETA 2824-2 Technical Background:
| Parameter | Value |
|---|---|
| Movement Type | Self-winding mechanical |
| Diameter | 25.6 mm (11.5 lines) |
| Thickness | 4.60 mm |
| Jewels | 25 |
| Power Reserve | Approx. 38-40 hours |
| Frequency | 28,800 vph (4 Hz) |
| Instruction | Details |
|---|---|
| Primary Use | As the train bridge, secures barrel and gear train (center wheel, third wheel, seconds wheel, escape wheel) for smooth power transmission |
| Normal Function | Bridge jewels provide precise pivot positioning for smooth gear train operation |
| Failure Symptoms | Deformed bridge or damaged jewels cause: gear train sticking, poor power transmission, unstable movement operation, low amplitude |
1. Preparation Place the mainplate face up – clean all jewel holes and screw holes
2. Position Train Insert barrel, center wheel, third wheel, seconds wheel, and escape wheel into mainplate jewels – ensure proper gear meshing
3. Install Bridge Align the barrel bridge (2824-105) with mainplate alignment pins and lower gently – ensure all pivots enter bridge jewels
4. Tighten Screws Use precision screwdriver to tighten screws in a diagonal sequence – apply even, moderate torque. A torque screwdriver is recommended
5. Check Smoothness After installation, manually rotate the barrel – check for smooth gear train operation without sticking
Important Note: If the gear train feels stiff after installation, the bridge screws may be over-tightened or pivots may not be fully seated. Loosen screws and retest. Recommended screw torque: approx. 5-8 cN·m.
| Aspect | Guidance |
|---|---|
| Inspection Period | Inspect bridge for deformation and jewels for looseness or chipping during each movement service |
| Wear Indicators | Signs of damage include: gear train sticking, barrel wobble, unstable movement operation, reduced automatic winding efficiency |
| Cleaning Method | Use specialized cleaning solution and ultrasonic equipment; avoid corrosive cleaners |
| Replacement Interval | Replace immediately if bridge is deformed, jewels are chipped, or screw holes are stripped |
| Service Advice | ETA 2824-2 movements should be professionally serviced every 3-5 years |
Q1: Can I install this bridge myself?
A: This repair requires movement disassembly, precise alignment of five wheel pivots into jewel holes, and proper torque control. Professional installation by a qualified watchmaker is strongly recommended.
Q2: What is the difference between the barrel bridge and the train wheel bridge?
A: In ETA 2824-2, the barrel bridge (Part 2824-105) functions as both the barrel bridge and the train wheel bridge – it is a single bridge that secures both the barrel and all train wheels. This is a common design feature of the 28xx series.
Q3: How do I check if the bridge is correctly aligned?
A: After installing the bridge and before tightening screws fully, gently rotate the gear train. If all wheels rotate smoothly without resistance, alignment is correct. If there is binding, one or more pivots may be misaligned – loosen screws, realign, and retest.
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