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One or two piece Enicar centre wheel cock jewel?

VWatchie

By VWatchie
in Watch Repairs Help & Advice

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VWatchie Distinguished Member

VWatchie

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1.thumb.jpg.5f21f62987413c00ce7e6eeb65b4ebfc.jpg
Centre wheel cock jewel

2.thumb.jpg.7eb6c8fb0fa9ab0b5bfd9e472b4b0167.jpg
Centre wheel cock

3.thumb.jpg.120b5b55ae69f058c675cb9f58549deb.jpg
Side of centre wheel cock jewel supporting the fourth wheel

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Side of centre wheel cock jewel supporting the centre wheel

MP1.thumb.JPG.6147cb34e73240968bd6759cb34576ab.JPG
Main plate top side. Non-jeweled centre wheel bearing.

I'm restoring and servicing an Enicar calibre A-R 161 and noticed that the centre wheel might benefit from a slight end-shake adjustment (nothing critical though). However, having a closer look at the jewel on the centre wheel cock, it looked like it might be a two piece jewel. This made me pause, as pressing the jewel(s) might lead to just pressing two jewels together without any simple way to rectify it. To me it sure looks like there could be two separate jewels in the hole, but I really can't tell. I've seen this type of jewel(s) in movements having a similar design but never had any reason to considered it before. So, the question is, can I adjust the end-shake or should I leave it alone? (Yes, I realize I will have to adjust the fourth wheel train wheel bridge jewel if a touch the centre wheel cock jewel)

Edited by VWatchie
VWatchie Distinguished Member

VWatchie

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No one who's pushed this type of jewel bearing out of its bridge to have a closer look? One or two jewels, that's the question 🤔

VWatchie Distinguished Member

VWatchie

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Just went through my box of scrap movements and found two having this type of construct. I'll take them apart and will see what it reveals.

HectorLooi Distinguished Member

HectorLooi

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I haven't seen this before but I am currently working on an AS1702 and it has a strange two jewel centre jewel. The upper jewel is pressed into a screw retained chaton. I'll take a photo of it when I get home.

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VWatchie Distinguished Member

VWatchie

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23 minutes ago, Nucejoe said:

Does it say the jewel count on the dial?  

Brilliant thinking Joe!!! 😀

Yes, 17 jewels! As shown in the picture, this movement doesn't have a jeweled centre wheel bearing. Hmm... I'll count the jewels and will get back.

Nucejoe Distinguished Member

Nucejoe

Posted
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 Dr ranfft says, in early samples minute wheel running on ruby stud, I gather wasn't so on late samples, so the question comes to mind, where did the jewel go instead?

This renders what I was thinking inconclusive.

Regs.

VWatchie Distinguished Member

VWatchie

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5 minutes ago, Nucejoe said:

 Dr ranfft says, in early samples minute wheel running on ruby stud, I gather wasn't so on late samples, so the question comes to mind, where did the jewel go instead?

This renders what I was thinking inconclusive.

Regs.

I don't think so! Counting all jewels I get 16 if I count the centre wheel cock jewel as one jewel. So, I think we can somewhat safely assume that the centre wheel cock bearing contains two separate jewels making the total jewel count 17.

image.thumb.png.eec03589f2e79e6a01ae1cdc63770448.png

15 minutes ago, Nucejoe said:

in early samples minute wheel running on ruby stud

So, I have an early sample!

I guess I won't be touching that centre wheel cock jewel. The end-shake wasn't too bad anyway...

Thanks for your input joe, much appreciated!

HectorLooi Distinguished Member

HectorLooi

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1 hour ago, HectorLooi said:

I haven't seen this before but I am currently working on an AS1702 and it has a strange two jewel centre jewel. The upper jewel is pressed into a screw retained chaton. I'll take a photo of it when I get home.

20220128_181149.thumb.jpg.e4a2a0ba13259af9409f3f9bb28322ed.jpg

20220128_181206.thumb.jpg.e514b2bc0fdd7d69caf0409d7bd2105f.jpg

As promised. 

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