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Rotor removal

tonydagee

By tonydagee
in Watch Repairs Help & Advice

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tonydagee Watch Enthusiast

tonydagee

Posted
Posted

Hello all.

Could some kind soul suggest a  way to proceed with the rotor removal on this movement please?

It’s  the first  time as a novice but I’ve worked on an automatic movement, and I expect to learn quite a lot about it. Probably the hard way… Anyway first of all I do have to remove this this part so I’ll be very grateful for your Superior knowledge. Many thanks! TonyG 

9E4A06EC-33A0-4E5E-9381-5088AFF1E765.jpeg

Nucejoe Distinguished Member

Nucejoe

Posted
Posted

Hi Tony,

Remove the two small screws, to stay on the safe side, I put a little penetrating oil on em over night.

Good  luck.

watchweasol Distinguished Member

watchweasol

Posted
Posted

Hi Tony justin case something goes pear shaped , what's the make and calibre of the movement, perhaps find a tech sheet for you, The are normally under the balance or on the train bridge.          cheers

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

Hi WW,Thanks for that advice. I haven’t dug down far enough to determine the calibre, but it is a rotary automatic.. Do I have to remove the rotor and automatic works before I find out?, TonyG 

 

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted
5 hours ago, Nucejoe said:

Hi Tony,

Remove the two small screws, to stay on the safe side, I put a little penetrating oil on em over night.

Good  luck.

 

Nucejoe Distinguished Member

Nucejoe

Posted
Posted
1 minute ago, tonydagee said:

Thanks Nucejoe!

i made some penetrating oil from vegetable oil 90% acetone 10%, see if that works!

tonydaG

Oh goodness, is this legal ? ?

Your regular cheapest watch oil would work. 

 

 

Klassiker Distinguished Member

Klassiker

Posted
Posted

I seemed to remember seeing this set-up before, so I checked through my own photos, and sure enough I have worked on an AS1700 which is the same. Here are the instructions:

image.png.9b8c4ea0ea7feba430752352e7972986.png

The full document is available on the Cousins site.

Looking at your photo, you need to turn the screw on the right a quarter-turn or less clockwise, until the slot lines up with the other dot. Then the rotor should be loose enough to lift off the axle.

 

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

Wow, thank you Klassiker!

I now have the data sheet for the AS 1900 as you kindly suggested, but not before I screwed up by loosening the the bolt guard screw at which point the assembly sort of exploded! Anyway, little mechanism whereby the cam under the guard plate engages with the slot in the axle. Nice!

on reassembly I can’t get the bolt guard screw to engage, nothing to screw into...! What am I missing, guys? 

Please see the pics and help this late starter hobbyist out of a jam!

tonydaG

 

2A34C9A9-AC25-48E0-AF71-A44E48735BF5.jpeg

8A601006-DAFF-4C4E-950E-C6DA4818C72C.jpeg

D6746A06-1726-4864-9E63-CD5BB4AABE78.jpeg

Klassiker Distinguished Member

Klassiker

Posted
Posted

try removing the rotor again, and then fit the screw. I suspect the locking bolt is pulling the hole in the guard plate off-centre relative to the thread.

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

Sorry, maybe I misunderstood… There is nothing for the screw to grip on under the  Bolt guard  as I can see from the first picture with the rotor and all the components removed...?

Klassiker Distinguished Member

Klassiker

Posted
Posted

Here's the underside of my rotor. You can see the end of both screws where they come through holes in the gear wheel. The bolt guard screw which you are struggling to fit threads into this gear wheel, not through into the automatic device.

I turned the locking bolt back into the closed position for this photo. It's best to build this assembly complete, and check its funtion, before fitting to the axle.

WIN_20210321_12_27_17_Pro.jpg.0c48cf120852028188ac826bf97cf087.jpg

The rotor and this gear wheel rotate together on the axle, and this gear drives the pawl winding wheel you can see peeking out from under the bridge in your first photo.

Having said all that, I just tried reassembling in the "wrong" order; rotor onto axle, turn the locking bolt to "locked", then fitting the bolt guard screw, and it went in fine.

Not sure any of this is helping. I don't really understand why you are having a problem at the moment.

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

 Actually this is helping, it’s great to work through problems like this… I’m going back to the drawing board for another go!  Thanks for your help thus far. 

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

 So no matter what I do, the screw won’t lead into the hole. Does your screw look like this? It can’t be wrong screw as it’s the first one I took off… I’m wondering if it’s broken? Very odd! Very sorry for the trouble but I must get to the bottom of this! 

CB47EAA8-A372-4489-A454-FC027E80A955.jpeg

Klassiker Distinguished Member

Klassiker

Posted
Posted

The screw looks correct and undamaged. Your problem must be with the threaded hole in the gear wheel. Is it obstructed? Is the thread damaged? Can you feed the screw in from the other side, to test the thread? How far did you go with the rotor disassembly?

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

This assembly went well I understand how the mechanism works and everything fits together. It’s just that the screw refuses to enter the hole on the bolt guard: it just balances(with difficulty) and falls away when the screwdriver engages immediately.

 I’m a retired dentist, so I’m used to working with teeny little things, but this one stumps me.

I’ll try the screw the other side as you suggested.

thanks.!

T

tonydagee Watch Enthusiast

tonydagee

Posted
  • Author
Posted

Ok, so  I tried everything but the hole in the guard plate is not big enough to accommodate the screw. Official. I was thinking of gently Reaming with a diamond dental file,  but it’s rhetorical now as the screw has pinged off to its graveyard. Anyway plenty left to do on this movement and thank you very much for your help K

T

Klassiker Distinguished Member

Klassiker

Posted
Posted

Don't worry, that screw will likely turn up sooner or later; of it's own accord if you wait long enough. They just like to see a bit of the world first. If you want to accelerate the process, there is plenty of advice on here about how to search for lost bits (magnets, vacuum cleaners etc.)

Is there a chance it was the wrong screw anyway? The chances of that hole in the bolt guard shrinking are remote to say the least. Removing metal from factory parts is always a last resort, and not recommended here.

Take a break, come back to it when you feel refreshed, and one way or another we will find you a screw that fits.

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