Jump to content

Recommended Posts

Posted

I have been struggling with a AS 1713 for quite some while (an automatic version of calibre AS 1900 that Mark has done an excellent video service guide for). I've already got some good input here on how to clean the caped jewels for the upper bridge of the automatic device. Thanks for that.

Next problem; Second hand is ticking nicely and timegrapher is giving an acceptable reading, but minute and hour hands are not moving. A classical lose canon pinion one might think. This calibre is a little different though. The canon pinion is not friction fitted, instead there's a friction pinion fitted to the third wheel as explained roughly 5:07 into Marks video: 

Any ideas on how to tackle this? Should I tighten the friction pinion is the same way as I would do with the canon pinion? Or is the springed minute wheel responsible for giving the pinion some extra friction on the pivot of the third wheel? 

 

Posted

This comes up alot with as1900 series the offset cannon pinion will indeed need tightening this can be done with a broach or needle the same or slightly smaller than the hole insert broach in hole and gently apply pressure with a pair of nail clippers to tighten it slightly don't go mad or you will over tighten if you look under strong magnification you might see marks where it was originally tightened The hard part is removing it from the shaft of the wheel without breaking it if I remember correctly Mark removes it and oils it in part 2 of the video I don't think he tightens it tho.

 

Posted (edited)
1 hour ago, Cad101 said:

This comes up alot with as1900 series the offset cannon pinion will indeed need tightening this can be done with a broach or needle the same or slightly smaller than the hole insert broach in hole and gently apply pressure with a pair of nail clippers to tighten it slightly don't go mad or you will over tighten if you look under strong magnification you might see marks where it was originally tightened The hard part is removing it from the shaft of the wheel without breaking it if I remember correctly Mark removes it and oils it in part 2 of the video I don't think he tightens it tho.

 

So I need to take it apart? Hm, I skipped this step during the service cause I lack the tools required. I will try to improvise ..

A follow up question. This will require me to disassemble a lot the movement that I have already oiled. As professionals, would you recommend start everything over? Clean pivot holes again etc. I guess oils in jewel holes will be misplaced if I remove the bridges for instance .. 

 

Edited by alexndr
Posted (edited)

If i should count the times i have to take a movement apart again. Many times it would be. I have a cup of isopropanol  that i dip the parts in. And do it all over again. That is what they called learn by doing :) . I don't think there is a option. That would be  to get a new part instead of tighten the old one.  

Have a lot of this cannon pinions with the wheel for AS1902. But it doesn't say on the box that AS1713 would work? Why is that? Almost the same movement except  for the frequency? 

Edited by rogart63
Posted

Wrong of me there. I did look on an AS1784 or something like that . Found a box with a new wheel and a cannon pinion now. Says AS1902 on the box. So they are the same. 

  • 3 weeks later...
Posted

To follow up ..

At first I had a hard time disassembling the wheel from the shaft. I have no Platax (yet). However I have the simple Bergeron 2810 roller remover and supprisingly it did the job. With just a small pinch at the right place the wheel popped off.

Next problem was to tighten it. The tools I have for tightening ordinary cannon pinions were to blunt. 

Finally I used the 2810 for tightening as well with a small broach inserted in the hole. Unfortunately I pinched it too hard and when the wheel was reinstalled on the shaft it wouldn't budge at all.

I bought a brand new frinction pinion instead. 5£ well spent.

  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • I have acquired a Citizen Leopard 36000 watch. My reason for purchasing it was my desire to own a timepiece with a 36,000 BPH movement, and the price was reasonable. Another motivating factor was gaining hands-on experience with the mechanism. The watch is in good condition, but I intend to fully disassemble it for maintenance. First and foremost, if anyone has prior experience with this particular model, I would greatly appreciate their insights. I do not have access to Citizen’s specialized lubricants and will need to use the ones available to me, such as 9010, 8000, and 8300 grease. Additionally, I do not possess the appropriate oil for the pallet jewels and will only be able to clean them.
    • Hello all, I am working on an older Valjoux Chrono. It doesn't have a stamp on the movement anywhere but I believe it is a Valjoux 72. I installed the train of wheels and they will not turn. The problem appears to be the 4th wheel and the escape wheel are not interfacing correctly. I had to replace both of these parts as the pivots were broken on each. I sourced genuine Valjoux/ETA replacements. I think the problem is with the escape wheel as all the wheels turn perfectly if I remove just the escape wheel.  My question to those with more Valjoux experience is am I mistaken? Is this some other model altogether and I have the wrong part or parts?    
    • I would remove the wheels, check for damage and if not damaged, clean. 
    • Thanks for the replies! Here's a photo of the front of the clock and a GIF animation of the movement (exposed by removing the black cap in the centre of the clock). You can see the behaviour of the gears. It's a fairly valuable clock from the 80s (Braun ABW 35). I'm not sure if replacing the movement would diminish the value, so I'd prefer to keep the original parts if it's easy to fix. But since the movement itself is pretty generic, I guess, maybe replacing it wouldn't make any difference with regard to the value of the clock? Or would it? I suppose the value is mostly in the design.
    • Well, my fundamental stance is that I want to go in and out without leaving any trace other than a shining, perfectly running movement. So, no scratchings on the inside of the case back lid, no marred screws, no debris, no fingerprints, and so on. That is, my goal is to make it impossible for the FBI to track me down. As a professional, I suppose you might want to keep track of returning watches, but as @JohnR725 mentioned, we can keep detailed computer records without marking the watch at all. That may not be true for every watch, but luxury and COSC-certified movements do have unique numbers. John also says it’s best to leave no sign you were ever there, and I couldn't agree more. Now, suppose the Sea-Dweller I'm working on is one day scrapped, and you want to sell the case-back separately (perhaps the case was destroyed in a plane crash). Then the scribbles on the inside no longer reflect the current movement inside the case. Also, the engraving will likely halve the market value of the case back. It had been "sleeping" for about a week and a half. Yes, the "debris/old lubricant" theory is my hypothesis as well! It will be interesting to see what I find once I have time to start disassembling the movement.
×
×
  • Create New...