Balance spring for watches with Swiss pallet escapement
Non-magnetic beryllium alloy NIVAROX Dimensions: Movement size in Lignes/inner balance rim diameter in mm
Instructions: 1. measure inner balance rim diameter 2. determine beat rate 3. multiply balance rim diameter by beat factor 4. select suitable coil spring
Beat factor: 18000/h => 1,000 19800/h => 0,909 21600/h => 0,833 28800/h => 0,625 36000/h => 0,563
Example: Measured inner balance rim diameter: 11.3 mm Beat rate 21600/h => 0,833 11.3 mm x 0.833 = 9.41 mm
The best fitting coil spring is therefore: 8 3/4'''-9.4 mm
Please note: This is a raw hairspring that needs to be modified and regulated.
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spirale Enfin, un endroit ou on peu trouver des spirales brut
Enfin, un endroit ou on peu trouver des spirales brut
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