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AS 1913

berniethebolt
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berniethebolt WRT Addict

berniethebolt

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hi,i am currently working on a AS 1913.All the wheels are spinning freely.the problem is when i pull out the stem to operate the hand function everything turns,including the mainspring barrel.when i push it back in the crown wheel engages and turns everything again.when i release the click to let the power down nothing happens.i have checked the keyless works and everything moves up and down as it should.am i missing something.i have tried using a different barrel (same model) but to no avail.any ideas please.B

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Marc Distinguished Member

Marc

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Sounds to me like the pallet fork is not interrupting the escape wheel.

This would mean that as you wound the watch everything would spin, and no power would be retained in the main spring, so nothing would happen when you tried to let down the main spring.

When you have the crown in the setting position the canon pinion has enough drag to also transmit torque back into the train, so once again everything would spin.

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berniethebolt WRT Addict

berniethebolt

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6 hours ago, AndyHull said:

Sounds like   the keyless work. Does the clutch engage and disengage when the crown is pulled?
Is the stem the correct one for the movement?

Can you provide better pictures of the keyless work in both positions?

it is the right stem.tried a spare i had.same result THANKS. B.IMG_20200321_142109.thumb.jpg.913b764146f44eae7c54ff0a5d793724.jpgIMG_20200321_142100.thumb.jpg.8134047c4d0205bbcc07879ad37020d6.jpg

Edited by berniethebolt
missed out my thanks!
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berniethebolt WRT Addict

berniethebolt

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5 hours ago, Marc said:

Sounds to me like the pallet fork is not interrupting the escape wheel.

This would mean that as you wound the watch everything would spin, and no power would be retained in the main spring, so nothing would happen when you tried to let down the main spring.

When you have the crown in the setting position the canon pinion has enough drag to also transmit torque back into the train, so once again everything would spin.

i get that.will try again with the pallet fork.thanks.B

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rogart63 Distinguished Member

rogart63

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You have a little special construction on this movement . With a friction drive on the intermediate wheel . Instead of a normal cannon pinion. Should think that is why it moves the barrel to . Put the pallet fork in.  Or the automatic bridge. 

This wheel turns the barrel . And has a friction like a cannon pinion. IMG_20200321_142100.thumb.jpg.8134047c4d0205bbcc07879ad37020d6_LI.jpg.02fff15583a9a95805f5d576322b6a94.jpg

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nickelsilver Distinguished Member

nickelsilver

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You have a little special construction on this movement . With a friction drive on the intermediate wheel . Instead of a normal cannon pinion. Should think that is why it moves the barrel to . Put the pallet fork in.  Or the automatic bridge. 
This wheel turns the barrel . And has a friction like a cannon pinion. IMG_20200321_142100.thumb.jpg.8134047c4d0205bbcc07879ad37020d6_LI.jpg.02fff15583a9a95805f5d576322b6a94.jpg
A normal canon pinion would move things too, but good catch. That micro canon pinion should be disassembled and greased like any canon pinion though. All things said, with pallet fork out, setting time or winding will have a similar effect if the fork is out.
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berniethebolt WRT Addict

berniethebolt

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On 3/21/2020 at 9:11 PM, nickelsilver said:

A normal canon pinion would move things too, but good catch. That micro canon pinion should be disassembled and greased like any canon pinion though. All things said, with pallet fork out, setting time or winding will have a similar effect if the fork is out.

thanks to all.i have now got the movement going.thanks again.B

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