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Rich9
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Rich9 New Member

Rich9

Posted
Posted

Hi all,

Been tinkering with a old mechanical movement, when reassembling, the wheel train through to the escape wheel moves freely when turning the barrel, when the pallet fork and bridge is inserted and the mainspring wound, it doesn't flick between both small pins though... the mainspring can be fully wound and released so a little puzzled!

Any advice would be appreciated 👍

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Nucejoe Distinguished Member

Nucejoe

Posted
Posted

Does fork arbour have any end shake?  

With zero end shake the fork isn't free to move, an easy test is to loosen the fork's bridge screw a turn or two. Bent fork pivot also hinders forks movement. Check jewels for forks pivots .

Nudge the fork to see if it snaps from side to side, misaligned pallets might hinder forks movement, or  pallets having moved in the forks slot unlocking of pallets can be hindered. 

Rgds

 

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JohnR725 Distinguished Member

JohnR725

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Posted
10 hours ago, Rich9 said:

old mechanical movement

pictures are nice description of what it is and its condition. In other words you've serviced did the watches of working that sort of thing?

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watchweasol Distinguished Member

watchweasol

Posted
Posted

Hi  did the watch run before you serviced it ?  If the train wheels are free up to the escapement  and ore not after introduction of the pallet that’s where the p4oblem lies, is the pallet installed correctly is there s bent pivot, cracked jewel. Untill the freedom of the pallet can be ascertained we have a problem.   You could removes all the train wheels and the balance and just fit the pallet and bridge again on its own after inspecting both pivots and jewels. Using a fine artists brush move the pallet side to side it should move with very little effort.

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      Thanks for the input - but I don't think this is the case either. I have inspected the spring and it looked fine with the bridle locked against the ridge on the barrel wall.  And as I said, I did manage to put a full wind on it using my tweezers without any slipping. @JohnR725 You might be right about pushing down when I use the tweezers! And yes I am aware that this is a cheap movement! I have just taken the watch back out of the case and removed the dial to see if I can see better. Strangely I was able to wind it  a few times without slipping when it was out of the case .  But when I try to release the power on the mainspring by holding back the click and slowly letting the crown turn, it slips. 
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      I was afraid of something like this and yes the pictures helpful for those that have never seen one of these. The problem with a watch like this made at a bargain price and they do things a little bit differently.   Nitpicky clarification required? When winding with the crown versus pushing with the tweezers visually is it exactly the same? Then when you whining with your tweezers are you pushing down at all? It's possible the mainspring is slipping on the other side farther into the watch. As I said these are made differently cheaper than a standard watch and we probably need a better image of the mainspring barrel itself. Like for instance you notice the upper pivot well if you do you're seeing things as there is no upper pivot. So another words is a strap holding the barrel in place and it's definitely made differently than the standard watch. Which means conceivably it slipping on the other side as things have worn out and you may not be a loose see that on the other side. One of the annoying problems with technical information that you download is conveniently when it was scanned the technical was not because they just wanted the parts lists. So we can see that the mainspring barrel in this case doesn't have an arbor. In other words it goes together a little bit differently than a standard watch and it's possible that it still has defect and is slipping somewhere in here. Then he is a website that shows a few pictures but not how the barrel goes together or the barrel itself which is unfortunate. https://17jewels.info/movements/e/eb/eb-8800/   EB_EB 8800etc.pdf
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