Jump to content

Omega 18Spb Lift Angle

Chainstay

By Chainstay
in Watch Repairs Help & Advice

 Share

Recommended Posts

Chainstay Member

Chainstay

Posted
Posted

As I am a gear-freak I just bought a timegrapher to test my watches (and my skills) after servicing.

 

I also just bought a pocket-watch on an internet auction, rather cheap I think, and I believe its equipped with an Omega 18SPB-movement.

 

Now I need to know the lift angle. It needs servicing and I really would like to have a before-and-after assessment of the movement.

 

Does anyone on this superb forum know the lift angle? I did search the internet of course but couldn't find it.

 

Besides that I'm planning to get in into adjusting my watches meaning hairspring work and so on (starting of course with inexpensive movements).

 

Pauli

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted (edited)

As I am a gear-freak I just bought a timegrapher to test my watches (and my skills) after servicing.

Do not worry too much about it. Even if you leave the default of 52° the instrument will still indicate daily rate and beat error, and show the general pattern correctly. Amplitude is only affect very slightly by having set the wrong angle, as you you can find yourself easily. Edited by jdm
Link to comment
Share on other sites
Chainstay Member

Chainstay

Posted
  • Author
Posted

Thanks, I'm satisfied with knowing that it doesn't mean a lot on determining daily rate and beat error.

 

And syfre: I have been watching this video, but I don't think the timegrapher I bought

s-l500.jpg

has the same features regarding calculating the lift angle by fixing the amplitude? (to be honest I don't really know because I haven't got it yet). Even if it is a feature I think it's a rather complicated way if someone had the correct figure (lazy as always).

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted

but I don't think the timegrapher I bought

has the same features regarding calculating the lift angle by fixing the amplitude? (to be honest I don't really know because I haven't got it yet). Even if it is a feature I think it's a rather complicated way if someone had the correct figure (lazy as always).

No it doesn't do that. It's a very basic model.
Link to comment
Share on other sites
  • 2 weeks later...
PeWe New Member

PeWe

Posted
Posted

I have the same device and I can tell you, it works. Use the  menu/speaker button to jump into the menu, where you can adjust the lift angle. Nevertheless it's not that easy to use, as you always have to leave the menu and go back again until the value of the amplitude is ok.

 

Pit

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted (edited)

I have the same device and I can tell you, it works. Use the  menu/speaker button to jump into the menu, where you can adjust the lift angle. Nevertheless it's not that easy to use, as you always have to leave the menu and go back again until the value of the amplitude is ok.

 

I stand corrected, the method in the video works with any timegrapher.

However, for a movement under test is it very difficult to visually determine the amplitude at which it is oscillating without using a slow motion camera. For example the video says to bring the amplitude to 180°, but from my observation they brought to approx 175°.

Edited by jdm
Link to comment
Share on other sites
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • DDean
      First Project Already A Bit "Sideways"

      By DDean · Posted

      I will try this weekend.  I've tried several times with my cell phone and it's just too small and recessed to get a good picture.  I need to get my macro lens and tripod out and then figure out how to get enough light down the hole in the side of the man plate to  actually show the top of the broken screw. I appreciate the effort and will try and get that pic this weekend.
    • RichardHarris123
      Simeon from Down Under

      By RichardHarris123 · Posted

      Hello and welcome from Leeds, England. 
    • Simeon
      Simeon from Down Under

      By Simeon · Posted

      Hi,   My name is Simeon I am based in Sydney, Australia and have recently got into watch repair / watch making.  I am very much a learner having serviced multiple forgotten watches, some of which were actually successful!   I have a slowly growing collection of watches, mainly old Soviet, a few Japanese and (not pictured) some Raketas, a Poljot Alarm, an Omega Speedmaster Reduced and a vintage (1972) Tissot Seastar.  I like unloved vintage watches, with quirky faces and enjoy bringing them back to life through the simple(!) act of disassembly, clearing and reassembly. I am an Electrical Engineer who also undertook a trade apprenticeship so I am reasonably handy - It's fair to say, I know just enough to get myself in trouble. 
    • Waggy
      Chinese clone demagnetizers

      By Waggy · Posted

      ha ha looks like a WMD.....you know I want one now  
    • Simeon
      Citizen Cosmotron X8 04-4800 Fault finding

      By Simeon · Posted

      I took a chance on a non running Cosmotron X8 ("perhaps just needs a new battery" said the advert). Sure enough, I open it up and it has the wrong battery installed (a Renata 344 rather than the correct Renata 386) and the screws holding the battery contact had been sheared off to half a head on both ends. Ho ho, I thought - there's the problem. I got the broken screws out easily enough and as soon as I placed the correct battery in place the balance started. This picked up speed when I reinstalled one side of the battery contact and looked like it was a runner. As I was trying to get the replacement screws in, I did one side but the second was a bit of struggle (hold down the battery contact against its spring while dropping the screw in with tweezers) the balance stopped again. This time it wouldn't start again. 98 percent sure that I didn't stick anything, anywhere important or break it in a mechanical way. The battery was in place for most of the struggling with the contact, so it might have had an intermittent connection which could have upset the electronics. I tried giving it a puff with the blower but the balance doesn't seem to rotate in the normal way, it seems to be held in a static position by magnet. It can be pulled out of this position but spins back and stops dead. This may well be correct for all I know. Anyway, does anyone know anything about these watches and can tell me how I would go about and fault find this? I will be servicing it at some point so should be able to rule out mechanical issues from an old watch but not sure where to start with the electrical part of it.
×
×
  • Create New...