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I think you're talking about this system (pics)
g
This one was in a Mido (if I recall correctly) and the system was identified in some reference book or another as "Incastar". And it's a terrible idea by the way. You can't regulate it without not only putting it out of beat, but also effectively "peening" or otherwise mutilating the hairspring in ways that require significant additional adjustment to correct.
_john
Free-Sprung Obsession: Am I alone?
Friends- When my watch obsession was beginning to take hold a few years ago, I read an article which stated that free-sprung balances are more ideal than those with regulators. And while I have only a vague understanding of engineering (I am a business ma...
Not entirely alone.
I certainly have a preference for variable-inertia regulators, of which the most typical examples are free-sprung. However, I have a particular soft spot for the old IWC system that combined a variable inertia balance for large adjustment with a regulator...
i have absolutely no idea what a free sprung balance is.
i probably own a watch with one, but i'm not technically minded so wouldnt know. i have several with no regulater, but i dont think that is the true explaination. someone please enlighten me. best Graham
Explanation....
Hey Graham, In a (very small) nutshell, a free-sprung balance is where the balance spring length is fixed and the adjustment is via the polar moment of inertia of the balance...hmmmm. Bit techy, sorry. From the other direction: On a balance with a regulat...
sometimes you can have both ...
... the Richard Lange has a free-sprung balance with a swan neck regulator I believe. Now why that would make sense (outside of esthetics) I don't know. Best Andreas
The reason for the RL swan neck...
as far as i know is that it adjusts the stud holder...much like the new GP Microvar setup. This is used to control the beat. Many (most?) watches that have a free-sprung balance have an adjustable stud holder of some kind. B
thanks Ben, i think i've...
thanks Ben, i think i've got it. from a money a saving point of view i like the vintage pieces to have regulaters so i can adjust them, but aesthetically i can see that a free sprung looks better and probably is of higher quality. cheers G
I am not an expert, but I believe this falls into
one of those instances where while one solution (free-sprung) offers at least a theoretical advantage (a more perfectly-formed hairspring, no regulator to get knocked out of position), in most practice there is a huge overlap with the performance of other...
free sprung vs. regulated
Also no expert, but the basics as I understand them: Free-sprung balances vs. regulated balances reflect two different ways of adjusting the rate (fast/slow) of the oscillating timekeeper. Free-sprung have a fixed-length hairspring, and thus the rate is a...
I don't know about the theory...
... but I find the ones with free sprung balances tend to run very regularly. They seem more immune to positional errors. The manufacturers I have had experience with are Rolex, Patek Philippe and Audemars Piguet. On the other hand a few carefully built w...
I think for me its about philosophy and emotion...
Rather than actual rate results or real world stability. I am fully aware that many fine watches with regulators keep time just as well as their freely sprung brethren, but I like the "idea" of stability that a free sprung balance conveys, and for me (pro...
Not always high end
Elgin produced the Durabalnce free sprung balance, though I don't know if it was ever used in production. FHF produced a free sprung production movement the FHF 72 www.ranfft.de . You see it from time to time on ebay in various watches around the $150 mar...
That's a good point...
That's a good point, I don't have any experience with watches/movements in segments that low, and thus they don't really enter into my thought equation. Obviously, the execution is a major factor. B
elgins
elgin produced tens of thousands of durabalance grade watches. the finishing was spartan, at best, but the movements were excellent time-keepers. i believe the free-sprung caliber 730a was the first wristwatch approved for US railway service. they were no...
I did not mean to imply the Elgin mov't was low end...
I was referring to the "$150 ebay" watches when I made the low end comment. Sorry for the confusion! B
The movement Nick cited has a regulator of sorts
After careful inspection of the movement in the link posted by Nickd, it seems that the rate can still be adjusted with the "cylinder" because the text states that this adjusts the length of the spring, which is what a regulator does. However, I don't kno...
More...
The index pins of a watch with a regulator don't grip the spring perfectly tightly, otherwise you'd have to slacken them to adjust the regulator. Classic theory says the balance is isochronous due, in part, to this gap. As the balance spring oscillates it...
I think you're talking about this system (pics)
g This one was in a Mido (if I recall correctly) and the system was identified in some reference book or another as "Incastar". And it's a terrible idea by the way. You can't regulate it without not only putting it out of beat, but also effectively "peeni...
Elgin Durabalance
In its freesprung form made it into production in the 760 automatic movement. I know I've seen some other dials marked with the 'db' but some of the durabalances were not free-sprung. A
There's something about those little screws...
...it's kinda like needing to see a carbie or three in the engine bay of a classic sportscar. Cheers, pplater.
Technical Ture vs Aesthetic Right
Most of the designs of watches are a gimmick nowaday. They are for perfectionists! Free sprung is a solution for dislocation of hair spring, regulator and index which is caused by shock. But the problem is past. Now we can weld the hair spring end with la...
