Jump to content

Balance staff: is this a decent quality?


Recommended Posts

I‘m going to replace the balance staff of a Russian pocket watch (Molnia 3602). Because it is the first time I purchase a balance staff as a spare part I am not sure about the finishing quality to be expected. Here are some pictures from what I got (ebay, „NOS“). Is this a decent quality for such an item or is it chunk? Your educated comments are highly appreciated.

IMG_8382.jpeg.d4c511f608ce17f8767d40b7de3fabdb.jpeg

IMG_8378.jpeg.0b5ffe5d375e9f2544671e99abfa8d95.jpeg

 

Edited by Kalanag
Link to comment
Share on other sites

  • Kalanag changed the title to Balance staff: is this a decent quality?
2 hours ago, Kalanag said:

I‘m going to replace the balance staff of a Russian pocket watch (Molnia 3602). Because it is the first time I purchase a balance staff as a spare part I am not sure about the finishing quality to be expected. Here are some pictures from what I got (ebay, „NOS“). Is this a decent quality for such an item or is it chunk? Your educated comments are highly appreciated.

IMG_8382.jpeg.d4c511f608ce17f8767d40b7de3fabdb.jpeg

IMG_8378.jpeg.0b5ffe5d375e9f2544671e99abfa8d95.jpeg

 

The hub looks a bit rough and the pivot doesn't seem particularly polished but that might just be because the photographer seems to have taken the picture with a potato 🥔😉 . The rivet still looks like it has its shape though.

  • Like 1
Link to comment
Share on other sites

  • 1 month later...
On 12/16/2023 at 5:02 PM, CYCLOPS said:

you should be able to use after clean-up in lathe as long as the hub fits the balance wheel.....

Meanwhile I found some time to investigate the dimensions of the new staff.

- The pivots fit the jewel holes

- The end shake is fine

- The wheel hub fits the wheel diameter

BUT

- The double roller ID is 0,2mm smaller than the staff‘s OD (0,4 vs. 0,6mm) 🤨

Not having a lathe, what would you folks do?

Edited by Kalanag
Link to comment
Share on other sites

10 minutes ago, Kalanag said:

Meanwhile I found some time to investigate the dimensions of the new staff.

- The pivots fit the jewel holes

- The end shake is fine

- The wheel hub fits the wheel diameter

BUT

- The double roller ID is 0,2mm smaller than the staff‘s OD (0,4 vs. 0,6mm) 🤨

Not having a lathe, what would you folks do?

Jacot ?

Link to comment
Share on other sites

5 hours ago, Kalanag said:

I should have mentioned that I don‘t have a Jacot tool.

Ronda catalog is showing the roller table diameter on staff as 56 maybe roller is too small . Could you measure on a reamer where you need to be with the size ? Stop short and finish with  a smoothing broach.  Reducing the staff would feel safer for me and normally easier to replace if things go wrong . 

  • Like 1
Link to comment
Share on other sites

3 minutes ago, Kalanag said:

Well, there seems to be no other option than purchasing a reamer that I will never need again. I‘m not happy with this idea (yet).

Can a cutting broach do the job?

Well I’ll throw tuppence in the pot, the knowledgeable folks will hopefully chime in. A cutting broach is basically a reamer with a taper, I would think this would be what you would want for this but I may be wrong. A reamer is parallel and would be more for making a true hole. Saying that I think there are also tapered reamers kicking about for things like morse tapers.

 

Tom

  • Like 1
Link to comment
Share on other sites

1 hour ago, Kalanag said:

Well, there seems to be no other option than purchasing a reamer that I will never need again. I‘m not happy with this idea (yet).

Can a cutting broach do the job?

I think that is what nev was meaning, reamer just being another term. I wouldn't be too happy either. 

  • Like 1
Link to comment
Share on other sites

2 hours ago, Kalanag said:

Well, there seems to be no other option than purchasing a reamer that I will never need again. I‘m not happy with this idea (yet).

Can a cutting broach do the job?

Do you have smoothing broaches that you can mark up the diameter on, so you have a gauge to work to. I do this when opening up a barrel hole so i know when to stop.

4 minutes ago, nevenbekriev said:

Yes, my english doesn't make difference between reamer and cutting broach. I try to improve it here...

Its ok nev those 2 terms are more or less interchangeable where ever you come from.  Reamers are often associated with their use in jewelling tools but some people also do call them broaches . Broaching and reaming mean the same, to open up a hole. Broaching a subject would be to open up a discussion usually a difficult one.

  • Like 1
Link to comment
Share on other sites

the roller or staff needs to have some taper to fit tight, you will use tapered reamers again and again in the future I'm sure, I don't know how you will hold the roller to do this maybe a pinvise.....be careful not to remove too much and hopefully the hole will not get out of round

  • Like 1
Link to comment
Share on other sites

Got this set of carb jet broaches (0,4 - 1,6mm) for just €9,- (shipping included). They worked well for the cutting. After finishing with a smoothing broach the result is fine 🙂

IMG_8721.thumb.jpeg.1eb1eca383c4b786ee810ff3b226bf09.jpeg

Edited by Kalanag
  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • The numbers in the white bar are the average values over the last x seconds. You can set x in the menus. The row of +4s are the s/d of the last four measurement periods. This short history is useful if the traces are wavy. Yours are just too good (dead straight)! The angle of the traces (very slightly up to the right, i.e. rising with time) is a graphical representation of the +4s/d. The vertical separation of the two traces is a graphical representation of the beat error. In your case it's 0.0ms, so the two traces appear to be one.
    • One of the problems with a lot of the videos are they really don't know what they're doing. Typically at the end of the service the put the watch on the timing machine often waiting into the watches fully cased up. As opposed to checking the movement when it's running before it's all cased up. In other words if you're going to have a problem it's nice to bill the work on the dial side without them being there for instance. Then when it is placed on timing machine the only place it in one position they comment how wonderful the numbers look and that really isn't adequate. But typically on those YouTube channels no one notices all the other strange and bizarre things they are doing either.
    • I agree with what the others are saying - I got a set of these when I was starting out and have never managed to use them, and I do a lot of Seikos. The other catch is that a lot of them have a brass arbor, which means that the hook for the spring is too soft and will wear out after a few uses, making them doubly useless. My advice would be to save your money and put it towards a Bergeon generic set - pains me to say it, but it's the only real option, unless you get a used set of generic winders on something like eBay, but this can be a minefield, especially if you aren't 100% sure what you are looking at. I would recommend a half set, if you can afford it, or if you are building up a few at a time, then size 5, 6, 7 will cover a lot of the mens watches. As a side note, if you are doing Swiss and Japanese watches you will need right and left handed versions as the Swiss springs tend to have a right hand wind, and the Japanese tend to have a left handed wind (there are exceptions of course in each case). If in doubt, post a picture on here before you order and people will guide you.
    • Both ends of the Poljot 2612.1 hairspring were "secured" with some kind if crappy glue. They came loose when I was straightening the spring. I placed all parts on the balance cock and used liquid shellac (dissolved in a bit of alcohol) to attach them again. I found using liquid shellac works easier then heating the solid stuff. The job is already fiddly enough without the need for a heatsource as well, but you need to be patient as it takes a few days for the liquid shellac to fully harden.
    • Cuare’s reply covers the Chinese winder set and their capabilities very well.  An alternative to getting calibre specific sets like these is to slowly build a set of quality Swiss winders.  They are sold individually, so you could buy a Bergeon handle and the 2 correct diameter and wind direction winders you need now initially, and buy the other sizes as you need them over time.    If you come across a movement you lack a winder for and feel you won’t likely use that size winder often, then just buy a replacement mainspring, because they come already wound and ready to be pressed into the barrel   You can usually sidestep the need for having both left and right winders in each size by reversing the wind of the spring as follows - wind the spring into a slightly undersized winder, push it out into the correct size winder to suit your mainspring barrel (thereby reversing its direction), and finally press it out into the mainspring barrel.  Best Regards, Mark
×
×
  • Create New...