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This is the Bergeon 30015 series broaches for hairspring-collets, specifically designed for adjusting the inner diameter of hairspring collets (balance wheel hubs) in watchmaking. The series includes three models – P, M, and G – covering different working ranges: 30015-P (0.40-0.90 mm), 30015-M (0.55-0.95 mm), and 30015-G (0.70-1.25 mm). This product is genuine Bergeon, made in Switzerland, and brand new in original packing.
| Feature | Description |
|---|---|
| Brand | Bergeon (Swiss professional watchmaking tool brand) |
| Model Series | 30015-P / 30015-M / 30015-G |
| Product Name | Broaches for Hairspring-Collets |
| Core Function | Resize and ream inner diameters of hairspring collets (balance wheel hubs) |
| Material | High-quality carbon steel / tool steel, precision machined |
| Shape | Tapered Broach |
| Origin | Made in Switzerland |
Model Specifications Table:
| Model | Min Diameter | Max Diameter | Application |
|---|---|---|---|
| 30015-P | 0.40 mm | 0.90 mm | Small hairspring collets, fine pivots |
| 30015-M | 0.55 mm | 0.95 mm | Medium hairspring collets |
| 30015-G | 0.70 mm | 1.25 mm | Large hairspring collets, thick pivots |
1. Select Broach:Choose the appropriate model (P/M/G) based on the existing collet inner diameter and target size
2. Secure Workpiece:Use a collet holder or tweezers to secure the hairspring collet – ensure stability during operation
3. Broaching Operation:Gently insert the broach tip into the collet hole and rotate clockwise while applying light downward pressure
4. Gradual Reaming:Test the hole size after several passes – avoid over-reaming
5. Clean Debris:Remove metal debris using a dust blower or soft brush
6. Final Check:Verify the collet fits perfectly on the balance pivot before assembly
Important Note: Broach gradually – do not attempt to enlarge the hole in one pass, as this may damage the collet or result in an oversized hole.
| Note | Details |
|---|---|
| Size Selection | Choose the broach model that covers the range from your initial collet size to your target size |
| Gradual Operation | Use a “few passes, frequent checks” approach – test the hole size after each few turns |
| Broach Direction | The broach is tapered – diameter increases from tip to base. Deeper insertion = larger hole |
| Cleaning | Wipe the broach with a soft cloth after use to remove metal debris; store in a dry place to prevent rust |
| Lubrication Advice | Apply a small amount of watch oil or cutting oil to reduce friction and tool wear |
| Safety Caution | The broach tip is very fine – avoid excessive force that may break the broach |
| Aspect | Guidance |
|---|---|
| Cleaning | Wipe the broach with a soft cloth after use; use alcohol wipes if needed, then dry thoroughly |
| Rust Prevention | Store in a dry place to prevent rust on the steel broach |
| Wear Inspection | Periodically check the broach cutting edges for dullness or damage – replace if necessary |
| Storage | Store in a dedicated tool case to prevent broaches from contacting each other |
| Replacement Interval | Long-lasting under normal use – replace when cutting edges are severely worn |
Q1: What is a hairspring collet broach used for?
A: A hairspring collet broach is a tapered reaming tool used to enlarge or smooth the inner diameter of a hairspring collet – the small hub that attaches the hairspring to the balance staff.
Q2: What are the differences between models P, M, and G?
A: The models differ by working range: P covers 0.40-0.90mm, M covers 0.55-0.95mm, and G covers 0.70-1.25mm. Choose based on the size of your collet and the target diameter.
Q3: How do I use a tapered broach correctly?
A: Insert the broach tip into the collet hole, rotate clockwise while applying light pressure. The further you insert the broach, the larger the hole becomes. Check frequently to avoid over-reaming.
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