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Odd behaviour from a Venus 188

Delroyb
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Delroyb Watch Enthusiast

Delroyb

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Right, an update on this. Last night and this morning, I did the following. 1: Fulled pallet fork, cleaned and re-oiled stones (with a lot less oil. 2: Stripped the balance and reset the hair spring so the impulse jewel is definitely in the centre of the banking pins.

No change at all. Stil beyond erratic.

Next stop is a check of the escape wheel, fortunately I have a few spare 188s so will see how we get on there. Thanks for the suggestions all.

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clockboy Distinguished Member

clockboy

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Looking at the vids I would say it not the escape or escape area. Something is slowing the watch possibly a bent pivot.As I stated in previous posts it only takes the smallest of faults to stop, slow or cause erratic behaviour


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Marc Distinguished Member

Marc

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I would remove the balance and inspect the drop and the run to banking on each tooth of the escape wheel, moving the pallet manually using a dry oiler. It may be that the pallet stones and/or the banking pins are out of whack (although these faults might be expected to manifest more consistently), or that there is damage to some of the escape teeth. It would at least be a good idea to be confident that each tooth on the escape wheel is engaging, locking and releasing consistently and correctly in order to rule out escape wheel / pallet issues. It might also be worth checking the guard pin and safety roller. If all these are ok then it looks like something is intermittently fouling the balance wheel causing it to occasionally rebound before it has reached its natural reversing point. In fact it might be worth just checking that first.

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  • 1 year later...
VWatchie Distinguished Member

VWatchie

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On 5/13/2017 at 10:16 PM, Delroyb said:

Thanks Marc, I will continue my investigations via process of elminiation. All good experience!

I know it's been a long time, but do you remember if you found the source of the problem and if you found a solution? Thanks!

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