Can this be fixed? (A visit from the fairy)

[p2n]

Drat. I know it's a left hand thread and was turning the right way but it just sheared off.

This is from an Oris.

Edited March 20, 2018 by p2n
typo

[rogart63]

Depends on how hard it's stuck. If the plate is made from brass and you have no other steel parts on it? You could remove it with Alum. 

Search the forum. Lot of info about that. 

[p2n]

1 hour ago, rogart63 said:

Depends on how hard it's stuck. If the plate is made from brass and you have no other steel parts on it? You could remove it with Alum. 

Search the forum. Lot of info about that. 

Thanks. The plate is all brass so will get some Alum and give it ago.

Any suggestions on where to get a replacement screw? What is the correct name for the gear/screw concerned?

[p2n]

Crown wheel and screw.

Cousins sell them, £22.95 (+VAT) for 100. I only need one. Drat.

[rogart63]

37 minutes ago, p2n said:

Crown wheel and screw.

Cousins sell them, £22.95 (+VAT) for 100. I only need one. Drat.

That was a little much for one screw? Maybe someone has a screw if you know what movement it is? 

[p2n]

36 minutes ago, rogart63 said:

That was a little much for one screw?

Yes lol. The whole watch only cost £5.50 on fleabay. I'm keeping to the cheap ones until I know how to keep the fairy at bay.

All I know about the movement is it's an "Oris". There doesn't seem to be any other identifying marks on it. I need to dissolve the stub out with some Alum and then clean it. I'll add some photos when I reassemble it.

[rogart63]

15 hours ago, p2n said:

Yes lol. The whole watch only cost £5.50 on fleabay. I'm keeping to the cheap ones until I know how to keep the fairy at bay.

All I know about the movement is it's an "Oris". There doesn't seem to be any other identifying marks on it. I need to dissolve the stub out with some Alum and then clean it. I'll add some photos when I reassemble it.

Have some boxes with screws from both pocket watches and normal watches. If you have the sizes of the screw i can have a look if i have anything that could work? 

If you buy the box of 100 screws from cousinsuk it's no  guarantee that there is one screw that would work in that lot. 

[p2n]

How do I measure it? There isn't any thread left - it's sheared off clean with the plate.

[rogart63]

20 minutes ago, p2n said:

How do I measure it? There isn't any thread left - it's sheared off clean with the plate.

Only thing is with an other screw. To check the size of the thread. 

The movement is a Brac 37 i think. http://www.christophlorenz.de/watch/movements/b/brac/index.php?l=en

[rodabod]

I’d try slotting it and unscrewing it. 

[p2n]

It's in the alum solution.

Any suggestions on how string/hot/long this needs to be/take?

 

[p2n]

The alum works - been soaking for a few days and been placing the pot in a saucepan of boiling water on the evenings for 30 mins or so.

Still needs a little more time as I think I can see a few remnants of the threads.

The only problem now is finding a replacement...

[anilv]

this is the proper sequence, no point ordering the screw if you can't get the broken bit out!

Anilv

[Alastair]

For the Alum thing, I use a trick....

Bung it all in an old glass Thermos flask overnight. Works a treat as it stays reasonably hot for hours.

[p2n]

It's all back together save for the crown wheel. Winding it direct it ticks so pleased with that.

The actual screw is

Head 3.2mm

Barrel(?) 2.3mm

Thread ~ 1mm

My vernier calipers are not the most expensive so these measurements may be out a little (and its all a little small for them...)

They sell a pack of these on cousins for £20 +VAT & P+P but the watch only cost fiver so I'm reluctant to spend that much!

So until then I'll be keeping an eye of fleabay for a job lot

 

[rogart63]

Have a old cimer or what it is. Looks about the same but not sure about the size of the screw. It's a left hand screw that much i know. head size is 3,15 so pretty close. 

[p2n]

That looks to be the almost the same mechanism!

Got any spare screws?

[rogart63]

17 hours ago, p2n said:

That looks to be the almost the same mechanism!

Got any spare screws?

No extra screws. have a couple of baumgartner movement also. They look the same. I have been through  my box of screws without any luck. Where do you live p2n ? Could send you some screws if you like. 

Measured the barrel and it's about 1,9 mm in diameter. Both on the baumgartner and the brac. thread is 1 mm . So that could work. 

I can measure the crown wheel . 

[Tmuir]

Sharpen some peg wood and screw it into the hole.

Then you can use thread gauges to get an idea of the TPI or metric equivalent.

Then comes the fun job of working out what thread it is.

 

[p2n]

I'll add thread gauges to my list of things to get - this list it getting quite long and expensive lol.

[rodabod]

Some Roskopf / cheap pin-pallet movements have a fake screw on the crown wheel which is actually a rivet. Just thought I'd mention that in case anyone else didn't know.

[p2n]

@rogart63 This made me chuckle - we forgot to check scale....

 

Out of the screws there were two types with the same thread. The problem is the shoulder, one too small and one too big.

Original in the middle:

 

I haven't got an broaches only needle files - what are the chances of being able to open the hole to accept the larger shoulder?

 

 

 

[rogart63]

Oooops . But as long as the shoulder on the larger screw has the same thickness . It should work to enlarge the hole. But not sure which metod is the best to do that?