New balance staff not riveting to balance

[praezis]

6 hours ago, VWatchie said:

There's no need to be condescending Frank. All I am trying to convey is that there is no risk of the stake reaching the hole in the balance when using a Platax tool.

But that is a different pair of shoes, I never talked of that. I assume that the tool will not reach the hole, no matter what you use. Easy with simple stake, too, if you keep the stake between your fingers while hammering.
When I push the staff out after removing the hub, I use a stake with cylindrical pivot, a bit smaller than the hole.  

As I said, no punching method or tool can protect the hole 
- from widening by the distorted staff
- from distorting hole and balance arm to a funnel-like shape if the rivet is too thick (happened to me decades ago).

I apologize if I seemed to be condescending, tried to say it friendly, but meanwhile I am tired of repeating the facts. But I know now, we had different issues in mind.

Regards, Frank 

 

 

[VWatchie]

5 hours ago, praezis said:

I apologize if I seemed to be condescending, tried to say it friendly, but meanwhile I am tired of repeating the facts. But I know now, we had different issues in mind.

No worries Frank! I see where you're coming from and thanks for clarifying! 

I would really hope someone, @Jon(!?) would make a video of how to punch out a staff using a staking set without first removing the hub or the rivet. Yes, Frank, you have clearly demonstrated that it is destructive, but for those of us who have no other option and are willing to risk it.

I haven't tried it but one dear WRT member whom we haven't seen in a long time, @HSL (anyone in touch with him?), recommended I try to remove as much as possible of the rivet before punching it out by using a razor-sharpened stake. Yes, I know, it is the hub that you must remove using a lathe, but at least I would think/hope that removing the rivet would be a step in the right direction.

[Endeavor]

Picking up this side-tracked post again as I just removed a balance staff of a 1920's Omega (35,5L-T1)

I was impressed by the way @Delgetti had his setup when he had to change out a balance-staff (https://www.watchrepairtalk.com/topic/28854-new-balance-staff-not-riveting-to-balance/page/2/#comment-244054

Not only that, but also the idea of removing the seat first before punching the staff out from the seat-side, avoiding the whole discussion of the rivet yes/no enlarging the hole.

I didn't have the fancy clamps & tools Delgetti has, so I used my screw-head polishing tool.

Initially I used #1500 grit diamond paste on the steel wheel, which kinda worked, but very slow. I changed to #800 grit diamond paste, which worked better, but still slow.

Then I glued #240 sanding paper to the steel disk;

That worked and the disk was hand-driven.

Once close to the balance wheel, I took the sanding paper off and continued with #800 diamond paste.

One can only do this when the balance wheel sits true on the staff and has no "wobble".

I went on grinding until I saw some diamond paste on the rim of the balance wheel. This was as far as I could grind and it seemed that at that point there wasn't much left of the seat.

Carefully, with my staking set, I knocked the staff from the seat-side out.

Turns out that the thickness of the seat left, now a small ring, was only 0.1mm.

The balance wheel hole is in perfect shape and no damage done to the wheel at all.

Of course, if the wheel has a "wobble" or isn't seated true on the balance staff, you can't get as close and there will be more left of the seat.

In my case, it worked perfect

I'm very happy how this method worked out !

 

Edited Sunday at 07:45 AM by Endeavor

[nevenbekriev]

This way is dangerous. The problem is that the collet is not expected to be perfect in this tool and the wheel used for the grinding is big and easy can touch the balance wheel. Can You show the bottom side of the balance wheel?

[Endeavor]

9 hours ago, nevenbekriev said:

The problem is that the collet is not expected to be perfect in this tool and the wheel used for the grinding is big and easy can touch the balance wheel

The whole process and the progress are closely observed, it's hand-driven and very controlled. I can't see the "danger", unless you are watching the TV while doing it.

As you could have read,

10 hours ago, Endeavor said:

no damage done to the wheel at all.

and in this quote "wheel" is the balance-wheel.

[praezis]

I also see a bit of danger for the wheel, at least you have to keep away from it and may get a too thick rest ring. My rest rings are about 0.05 mm.

Better way would be a grinding wheel touching the staff with its circumference.

Frank

[Endeavor]

19 hours ago, Endeavor said:

Of course, if the wheel has a "wobble" or isn't seated true on the balance staff, you can't get as close and there will be more left of the seat.

Not having all the fancy equipment, this is a way I came up with. I never said it was the best, the most ideal or the safest way.

Working on balances is always a delicate task whereby full concentration & common sense should prevail.

I was well aware of the "dangers" / short comings involved, hence my "warnings", as quoted above.

The balance wheel of the Omega was nice true, flat and one could clearly see how much gap there was left before the grinding wheel would touch the balance wheel. I stopped when the generously applied diamond paste started to touch the rim of the balance wheel, which turned out to be with a seat thickness left of 0.1mm. Tapping the remainder of the staff out went easy and flawless.

My idea of penning this article was to show/share a way which, in my case, succeeded perfectly. If deemed to risky, or if the balance wheel is not true or has a wobble, other methods have to be followed (which BTW, as you can read in this thread, are rife with "dangers" as well)

Edited Sunday at 01:51 PM by Endeavor

[Neverenoughwatches]

On 4/8/2024 at 10:26 AM, VWatchie said:

Thanks! I never heard the expression before but it makes sense. Looking at the pictures again it says "braclet" (misspelled).

You often see the term used on old watch part boxes.  Staffs for bracelet watches, timing washers for bracelet wstches etc.