Jump to content

Lift Angle for old Bulova

margolisd

By margolisd
in Watch Repairs Help & Advice

 Share

Recommended Posts

margolisd WRT Addict

margolisd

Posted
Posted

Hi folks. Long time no post. Having a baby means there is less time for watches :(

Does anyone know the lift angle for the Bulova 10A series of watches from the 1920s. I'm trying to get an accurate reading on a movement I'm repairing. In particular I have a 10AI. I couldn't find the lift angle anywhere so I tried to calculate it using this method. The result was 59 degrees. But that seems quite unusual...

 

Link to comment
Share on other sites
rogart63 Distinguished Member

rogart63

Posted
Posted

Should think you will be fine with using 52 degree . I have never seen a movement that has 59 degree lift angle . If you look at the other Bulovas they are around the same . 50 -53 . There would not be much different if you set it to 50 or 52 degree . 

  • Like 1
Link to comment
Share on other sites
margolisd WRT Addict

margolisd

Posted
  • Author
Posted

Thank, yes I spotted those on the lists. There seem to be a set of 10s that are very different. All from them 60s. Mine is from the 20s. It's similar to this:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Bulova_10AE

Thanks for your advice. I think I'll just leave the machine on the default 52 and see how I go :)

 

  • Like 1
Link to comment
Share on other sites
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • praezis
      New balance staff not riveting to balance

      By praezis · Posted

      I also see a bit of danger for the wheel, at least you have to keep away from it and may get a too thick rest ring. My rest rings are about 0.05 mm. Better way would be a grinding wheel touching the staff with its circumference. Frank
    • Neverenoughwatches
      Stem broken - can it be rescued?

      By Neverenoughwatches · Posted

      Not easy to find this one everywhere,  so it depends where you are located. Joining it back together might be possible, i have silver soldered mild steel before even with traditional plumbers lead and its a pretty strong joint, but bere in mind this is only 1mm diameter.  The join would need to be very accurate,  it not something i have heard of anyone trying before. The part no 401 is the swiss code number and relates to watch winding stems in general
    • Bonefixer
      AS2063 - hand setting

      By Bonefixer · Posted

      Thanks everyone for your helpful replies. I think between us we’ve worked out what’s going on. Next job is to have a proper look at this great wheel assembly, see if I can remove the clip and the friction fit pinion, give the bits a good clean, then put it back together with a bit of blue grease. I’ll also get the pallet fork under the microscope to see if it’s ok or been damaged. 
    • Mercurial
      AS2063 - hand setting

      By Mercurial · Posted

      The cannon pinion (be it conventional style or what you see in this movement) should slip on its arbour so the hands can be set independently without affecting the gear train.  If there is too much friction between the cannon pinion and the second wheel, turning the hands to set them backwards can sometimes force the escape wheel teeth to overrun the pallet stones, creating the behaviour you describe. The train is running in reverse when this happens.  This can often chip the pallet stones. I’d say at least half of the watches I’ve inspected with very tight cannon pinions had chipped pallet stones. Hopefully this isn’t the case with your watch.  I’m not familiar with this movement but you need to get the friction in the cannon pinion adjusted correctly.  Hope this helps, Mark
    • Bonefixer
      AS2063 - hand setting

      By Bonefixer · Posted

      Pallet fork was in. I’d had the movement running ok, and only removed the balance to flip it over and install the keyless works and date mechanism. The pallet fork wasn’t locking the gear train when hand setting - it was oscillating as the escape wheel rotated. This may have been in one direction only - can’t remember. 
×
×
  • Create New...