Jump to content

Automatic Watch Power Reserve Chart Help

Titanium

By Titanium
in Tools & Equipment

 Share

Recommended Posts

Titanium Watch Enthusiast

Titanium

Posted
Posted

I have been playing with some automatic watches recently so I got a Bergeon 7803-230 automatic watch tester. You put the watch completely run down on the watch holders and it spins them at 4RPM. You leave the watch on it for a known period of time e.g. 3 hours. Let the watches run down. Note the hour it stopped at. From this you know the power reserve and you can compare this on the chart.

My interpretation of the chart is the left had column is how long the watches are spun for and the right hand column is the power reserve in hours. So if you spin the watch for three hours it should run for between 14 to 24 hours. This seems a lot of wind from 3hours of spin.

Plus I thought automatic watches needed wound by hand when they run down to get them going again.

Any help would be appreciated.

DSC_1330.JPG

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted

Yes and even more with bidirectional auto mechanisms - right side of right chart.

For example a Seiko 7S26 fully winds in 1 hour on a 30 rpm winder. And it start fine from being fully unwound without having any mean to be hand wound.

Link to comment
Share on other sites
clockboy Distinguished Member

clockboy

Posted
Posted

I have a Chinese version of the Bergeon which also has this chart. To be honest I have never bothered to work out what the chart indicates. I just use the winder to check that the auto is functioning correctly over a period of say 48 hours & also to give a better indication of how a watch is performing.

  • Like 2
Link to comment
Share on other sites
Titanium Watch Enthusiast

Titanium

Posted
  • Author
Posted
On 04/02/2017 at 9:00 AM, clockboy said:

I just use the winder to check that the auto is functioning correctly over a period of say 48 hours & also to give a better indication of how a watch is performing.

That's a really good idea. Thank you to everyone for the help.

 

I know the tester is supposed to be in a vertical position to the watches are rotation in three axis's instead of one however does it make much difference?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • mikepilk
      Setting lever spring

      By mikepilk · Posted

      I would harden and temper (to a light blue). It's so easy to do and only takes a couple of minutes.
    • Waggy
      Movement holder made with 3D printer

      By Waggy · Posted

      Here is the insert ring for rectangular or elliptical movements: Note that the length is the side with the stem cut out on the spreadsheet (in the picture below this is 15.15: Here is the fake pdf file, again you need to convert to .zip after download to access the FreeCAD and 3mf files. Rectangular insert disc.pdf    
    • JohnR725
      Omega cal. 565 - low amplitude

      By JohnR725 · Posted

      as you took the mainspring out what did it look like? It's amazing how much amplitude you can get if the mainspring actually has the proper shape. last week I was doing a 12 size Hamilton and was very much surprised with the beautiful back curvature the mainspring had. Then the watch had a really nice amplitude the group would be so proud it was 350 until I dropped the lift angle down to 38 that drop the amplitude quite a bit below 300. then with the beautiful back curve it still had really nice amplitude the next day. I really wish all my mainspring's look like this as the watch had beautiful amplitude the next day. So many of the aftermarket pocketwatch Springs I see now do not have anything resembling a back curve may be a slight curve and that's about all. They still work but they just don't work as nice as a properly made spring. then Omega as all sorts of nifty technical documentation unfortunately every single corner is watermarked with where it came from who downloaded it etc. very paranoid company. On the other hand I will snip out images like from the document on recycling a mainspring barrel. for instance here's the section on what your mainspring should look like. water damaged a lot of times means rust was there rust on this watch?
    • RichardHarris123
      Without Our Forum

      By RichardHarris123 · Posted

      I wondered that?
    • Neverenoughwatches
      Without Our Forum

      By Neverenoughwatches · Posted

      I dont understand why a patreon membership would have limited places ??
×
×
  • Create New...