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When to replace a mainspring?

Posted: Fri Feb 12, 2016 6:09 pm
by Maurizio
When should one replace a main spring? How do you know its power has gone?

Re: When to replace a mainspring?

Posted: Fri Feb 12, 2016 6:10 pm
by MtKuile
That's a difficult question to answer. Depending on your approach you might never want to replace a mainspring. If you think the mainspring is original and you follow the approach of a conservator, you may conclude that the mainspring should never be replaced. If that means that the clock cannot run anymore because the mainspring is damaged or has lost its power, then the owner of the clock may be disappointed. Indeed, the owner may want the clock to run. A compromise might then be to replace the mainspring but to keep it with the clock.

If the mainspring is obviously not the original (and that in itself is not always easily determined) then a good rule of thumb is: "When a mainspring's diameter is equal to or less than twice the diameter of its barrel, then replace the mainspring."

Re: When to replace a mainspring?

Posted: Fri Feb 12, 2016 6:12 pm
by Maurizio
Should I use a stainless steel spring or a carbon steel spring?

Re: When to replace a mainspring?

Posted: Fri Feb 12, 2016 6:14 pm
by MtKuile
I would try a carbon steel spring from Clockspares. Carbon steel springs have less power than the stainless steel variety which often have way too much power for a spring driven clock.

Re: When to replace a mainspring?

Posted: Mon Jul 10, 2017 11:57 am
by Panharith
How do you know its power has gone?





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Re: When to replace a mainspring?

Posted: Thu Nov 23, 2017 4:33 pm
by AdminCR
Because the clock is no longer running the full period (typically 8 days).