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As @praezis an Laurie Pennman calculated correctly the rule of thumb should be 1/4 instead of 1/3 -
By watchweasol · Posted
You are correct Old Hippy. You are limited as to what’s available in the market place. And the closest you can get for the clock/watch you are working on as you say you may never fit the exact spring as it was made with. -
By watchweasol · Posted
Hello and welcome to the forum, there are several possibilities already mentioned dirt etc. take out the fork and re fit the balance and give it a puff or a light brush to start it moving , should run for a while on its own if free and also check out the spring coils for being stuck together or out of flat. -
That means if you play by there strict rules then in many cases you might never fit the correct mainspring. These days as you know there is a limit on springs available, so you have to go for the nearest that is available. -
By watchweasol · Posted
Hi. As a rule of thumb Iwould say so as the spring needs space to operate. But the actual data for springs in barrels is calculated as Lauri Pennmans formula in his book for exactness and confirmed by Prazeis (Frank) who also came to the same conclusion with his calculations. So in conclusion Pennman/Prazeis are correct and De Charles theory is just a guide.
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