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You are so true on a lot of what you have said. The main reason for changing the mainspring even if the old one is in good order is because it will take out your thinking that the mainspring is contributing to poor power output or fluctuations in amplitude. If a new spring is fitted that box can be crossed off as a potential source of a problem. Most customers are happy to pay the extra £20 for a new mainspring if they are already parting with a couple of hundred pounds for a service. A new spring is an investment for good running for the future. -
By nickelsilver · Posted
According to Borel the 814 and 815 use the same escape wheel. It's kind of an oddball being so long. -
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By nickelsilver · Posted
Yeah you need more amplitude, and if this is full wind a new mainspring isn't going to get you there- there are other issues. Good news is if that's your max delta at this miserable amplitude it will probably run great when you get it up to something normal! -
There is this line in the Hermle service manual that keep ringing in my head "understands the limitations of a mechanical clock" I have never found anyone who will talk frankly and quantitatively about what these limitations are. They always seem to get defensive when asked the question. I found this graph at -Measuring the rate of Hermle 340-020 floating balance | MicroSet Clock and Watch Timer (bmumford.com). "The following graphs indicate how the rate changes in a new Hermle 340-020 floating balance movement over the week that it runs." "Each grid line represents 20 seconds of error per day." The summary text states "The rate was relatively stable for five days and then began to slow down." That is just what I am seeing. Could it be I am bumping up against "limitations of a mechanical clock"?
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