Jump to content
  • 0

Mainspring selection


Question

Hi there.

 

I have acquired an assortment of new mainsprings, however, neither are in marked envelopes, they are just held in the plastic ring, some have a number like '80' on the plastic and others don't.  So my question is how I identify these mainsprings?

I have attached a phot to show how they have been delivered.

 

Thanks in Advance.  Bethan

 

mainsprings.jpg

Link to post
Share on other sites

3 answers to this question

Recommended Posts

  • 0

Unless you know the make of the springs those numbers could mean anything. The only way in finding out the height and strength will be to remove them from the rings and measure them.

Link to post
Share on other sites
  • 0

Even easyer: all you need is a calliper.

1. measure the diameter in the ring (is the number in 1/10 mm)
2. measure the hight
3. measure the blade thickness: thickness of the packed blades on one side divided by the number of coils.

Your spring is determined.

If you want to know which movements they fit in, you need e.g. the GR catalog (available online at Cousins afaik).

Frank

  • Haha 1
Link to post
Share on other sites
  • 0
33 minutes ago, praezis said:

Even easyer: all you need is a calliper.

1. measure the diameter in the ring (is the number in 1/10 mm)
2. measure the hight
3. measure the blade thickness: thickness of the packed blades on one side divided by the number of coils.

Your spring is determined.

If you want to know which movements they fit in, you need e.g. the GR catalog (available online at Cousins afaik).

Frank

You may never find producers spec, yet can use it.

Insert barrel arbor as the coil is in the ring, should hold tight. The coil inside the ring should look about the same  as the old one inside the barrel. Take into account all said above.  Best wishes.

Link to post
Share on other sites


  • Similar Content

    • By Gary
      Hi All!
      i purchased a lot of watch parts and mainsprings from an estate. Is there anyway to identify parts, mainly mainsprings that have fallen out of packaging? I have them in various forms and some clock mainsprings? I don't or will not use them.
      i am attaching a photo of two. I have several of these and smaller ones that are probably for women's movements? I also have several stems and they are marked in a bag like 615 or a three digit number?
      thoughts or direction are always appreciated! 
      Gary


    • By Atticus
      I recently had a 1962 vintage Longines cal 280 men's mechanical watch serviced. The mainspring was "tired" and the watchmaker ordered a replacement from his supplier. Upon receiving it, he noticed the end did not match the one he removed. He nonetheless installed it and advised me that the watch would require winding more often due to the spring slipping if it was tightened too much. The watch runs fine other than the more frequent winding required. I would like to locate an original mainspring if possible. I found on the ranfft website that the cal 280 movement has a mainspring with the dims 1.10 x 12 x 0.13. I assume 1.10 is the spring height and 0.13 the spring thickness, but am not sure if 12 is the spring length in inches or the barrel diameter in mm (the spring does appear to be about 12 inches long, though). On another website I found a diagram showing various spring ends, with one of the figures showing a "Longines T end." It was the only figure that had the word Longines associated with it. My question is: how would one go about locating the correct replacement mainspring for the Longines cal 280 movement? See attached photos which suggests the spring removed does not have a T end, but a thickened bridle (I think that is the correct term, anyway). Thanks from a watch amateur.



    • By jimbob
      Hi all, just received my Generale ressorts 2 catalogue from cousins £22.45 inc postage.  Problem is I can't find a supplier that sells by GR codes,  only by size.  The spring I want is in the catalogue but not sold anywhere I can find in the sizes I quote.  Has anyone got any ideas where I can get what I need?  I live in the UK.
  • Recently Browsing

    No registered users viewing this page.

  • Topics

  • Posts

    • Thank you for your introduction and welcome to this friendly forum.
    • so now we have the ultimate? How do we deliver it?  
    • Russia is member of the Universal Postal Union and as such their Post must accept pieces for any destination. International tariffs link https://www.pochta.ru/documents/10231/726549028/УУС+2021_.pdf/ Interstingly unlike hey do not group destinations by listing orcontinents but by distance - however measured.  Then any individual seller is free to decide where they do ship and where not. I suggest that you contact the seller and inquire, he may be just be unfamiliar with remote destinations prices. 
    • I don't get your point. If you make or maintain a measurement tool, of any kind, you need a reference for calibration or just validation. It can be more or less accurate but it has to be there, that's metrology 101. You can have all the atomic clocks and Network Time Protocol to disseminate time, the issue is how to bring that accuracy to a standalone device and know if it is reliable.  Otherwise one can get into watercolor painting or other interests that do not require that kind of approach at all. 
    • Material houses like cousins, eslinger, ofrei, julesborel do carry watch parts, though I doubt you can find a sign crown for this. Familiarize with  Dr ranfft's very popular database for good general information on most calibers, just google ETA 1260 ranfft. Good luck
×
×
  • Create New...