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Silentsailor23

By Silentsailor23
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Silentsailor23 New Member

Silentsailor23

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Posted

Hello all. Found myself a new hobby of pocket watch restoration a few years ago. Been in and out of it due my career as a submariner but now looking to spend more time involved in it. 

Fairly well set up with tools etc, but sadly had to let my lathe go to a new home last year.

I have several watches in a collection, my favourite are railroad especially Waltham.

Already have a few successful repair jobs under my belt and I'm a member of the BHI.

So, what brings me here I hear you ask?

My current project is a repair on a cylinder escapement movement with, yeh you guessed it, a broken balance staff.

I've just been reading threads on here from last year about how tricky it is to replace the plugs at each end. In my case, on end is completely bent over which I've straightened out but I have zero confidence in strength. 

Im happy to remove the staff, measure it and hopefully track down a replacement.

Happy to discuss options.

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    • RichardHarris123
      Setting lever spring

      By RichardHarris123 · Posted

      I'm assuming that every time you set the watch you are work hardening the detent spring, maximum hardening is  where it meets the plate due to maximum deflection.   That's why it snaps there.  The Young's modulus may be the same but after it's reached its maximum yeid strength it breaks.  My mechanic engineering is very rusty, correct me if I'm wrong. 
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      By Neverenoughwatches · Posted

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    • nevenbekriev
      Is this a 'hack' ?

      By nevenbekriev · Posted

      OK, welcome in the world of alarm clocks... I guess the 4th wheel is dished because it is from another movement. If it was not dishet, then it would not mesh with the pinion of the escape wheel, am I right? The marks of wear on the 4th wheel pinion doesn't corespond to the 3th wheel table position, at list this is what i see on the picts. Calculating the rate is easy - there is a formula - BR = T2 x T3 x T4 x T5 x 2 /(P3 x P4 x P5) where T2 - T5 are the counts of the teeth of the wheels tables, and P3 - P5 are the counts of the pinion leaves. Vibrating the balance is easy - grasp for the hairspring where it should stay in the regulator with tweasers, let the balance hang on the hairspring while the downside staff tip rests on glass surface. Then make the balance oscillate and use timer to measure the time for let say 50 oscillations, or count the oscillations for let say 30 seconds. You must do the free oscillations test to check the balance staff tips and the cone cup bearings for wear. This kind of staffs wear and need resharpening to restore the normal function of the balance.
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      By RichardHarris123 · Posted

      Glue a nut to the barrel lid, insert a bolt, pull, disolve the glue.  Maybe someone will have a better answer. 
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