Jump to content

screw head


Recommended Posts

Hey

Any way suggest the best way of removing this screw.

Do not want to drill it incase i destroy the thread.

Ain,t there some chemical i can use that will dissolve the screw but not the bridge?

 

cheers

gary

IMG_20200528_220833.jpg

IMG_20200528_220759.jpg

IMG_20200528_220714_BURST002.jpg

IMG_20200528_220714_BURST001_COVER.jpg

Link to comment
Share on other sites

As long as you remove all of the other steel component so you only have the plate then you can use alum mixed in water and that will dissolve out the screw. If you're in a rush you can warm up the solution It will dissolve it out faster.

  • Like 1
Link to comment
Share on other sites

I have the Bergeon tool "Kraai" shows via a video.  Expensive as always with Bergeon but works a treat. I have not had much success using Alum but I suspect it must be my method the only issue is the amount of time it takes. 

Link to comment
Share on other sites

I tried and failed with alum on a battery spring/retaining screw on a Seiko 7548. Several days and a very concentrated solution but the screw remained unimpressed by my efforts. As you can see, I may have got carried away with the strength of the solution, it became crystalline over a few days in the airing cupboard.

IMG_5239.thumb.jpg.e46550191edb464d1b7421015a6f379a.jpg

I have now ordered a Bergeon type tool. Where from? Well, let's just say that when it arrives it will be disinfected in case the person who packed it had a bat sandwich for his breakfast.

Link to comment
Share on other sites

That is the only bergeon tool I ever bought as I thought it is a life saver. I used it twice so far, both times I brutally damaged the main plate. I still have nightmares. :) However knowing about myself probably I was not careful enough and I had no experience or has no experience yet as how to use it properly. I seem to have difficulties to understand that you have to take your time when you deal with watch movements.

The crown shaped end of the tool could not get a good grip on the broken screw by the way and I made also a mistake not to use the proper sized tool originally and when I used the right size? it was already too late. Was too hasty etc. The watch i prepared as an xmass present for Mrs still has the broken screw and this thing never goes away... i must fix it sooner or later as it will haunt me forever.

Edited by luiazazrambo
  • Like 1
Link to comment
Share on other sites

9 minutes ago, Pip said:

I tried and failed with alum on a battery spring/retaining screw on a Seiko 7548. Several days and a very concentrated solution but the screw remained unimpressed by my efforts. As you can see, I may have got carried away with the strength of the solution, it became crystalline over a few days in the airing cupboard.

That most probably was a stainless steel screw. Modern screws often are SS.

Frank

  • Like 1
Link to comment
Share on other sites

2 minutes ago, praezis said:

That most probably was a stainless steel screw. Modern screws often are SS.

Frank

And as stainless steel has a lower tensile strength than the corresponding carbon steel equivalent, makes it more likely to shear off......and while the stainless won't rust, damp can cause galvanic action where the brass plate it is screwed into can start to corrode....

  • Like 1
Link to comment
Share on other sites

32 minutes ago, luiazazrambo said:

That is the only bergeon tool I ever bought as I thought it is a life saver. I used it twice so far, both times I brutally damaged the main plate. I still have nightmares. :) However knowing about myself probably I was not careful enough and I had no experience or has no experience yet as how to use it properly. I seem to have difficulties to understand that you have to take your time when you deal with watch movements.

The crown shaped end of the tool could not get a good grip on the broken screw by the way and I made also a mistake not to use the proper sized tool originally and when I used the right size? it was already too late. Was too hasty etc. The watch i prepared as an xmass present for Mrs still has the broken screw and this thing never goes away... i must fix it sooner or later as it will haunt me forever.

Gonna quote Luke in the Cantina here: "I'll be careful." I have a spare mainplate on the way so I'm covered if I balls it up but I'd rather get the screw out if I can.

 

25 minutes ago, praezis said:

That most probably was a stainless steel screw. Modern screws often are SS.

Frank

I guess you are right. I have a big bag of alum and not a lot to do with it. I could pickle some onions later in the year!

Link to comment
Share on other sites

That's 99.999% sure a left hand thread, I've found that screws are often rather loose in their threaded hole once the head breaks off, see if you can get a grip on it with strong tweezers and go righty-loosey. You can mimic the Bergeon tool somewhat using a staking tool to capture the screw by each end and turn the bridge to unscrew.

  • Like 1
Link to comment
Share on other sites

1 hour ago, Pip said:

I tried and failed with alum on a battery spring/retaining screw on a Seiko 7548. Several days and a very concentrated solution but the screw remained unimpressed by my efforts. As you can see, I may have got carried away with the strength of the solution, it became crystalline over a few days in the airing cupboard.

IMG_5239.thumb.jpg.e46550191edb464d1b7421015a6f379a.jpg

I have now ordered a Bergeon type tool. Where from? Well, let's just say that when it arrives it will be disinfected in case the person who packed it had a bat sandwich for his breakfast.

Don't you mean a tin of this?

Bat-Soup.jpg

  • Haha 1
Link to comment
Share on other sites

3 hours ago, nickelsilver said:

That's 99.999% sure a left hand thread, I've found that screws are often rather loose in their threaded hole once the head breaks off, see if you can get a grip on it with strong tweezers and go righty-loosey. You can mimic the Bergeon tool somewhat using a staking tool to capture the screw by each end and turn the bridge to unscrew.

I also managed to get out a screw similarly, used a bit of penetrating oil and with a lupe and with fine tweezers a managed to rotate the screw by the fraction of a mm by pushing the outer side of the screw as many times as it was required to be able to grab it at the end of the process. I guess it only works if the screw is not seized in its hole too much.

I also think that i am now in a better position with using the bergeon tool having a stereo microscope with ring light so I could actually see what I am doing instead of being blind and go with full speed. :)

Edited by luiazazrambo
Link to comment
Share on other sites

1 hour ago, Nucejoe said:

In this case, enough of the screw sticks out to grab with a nail clipper or needle nose pliers.

Is there a reason a pin vise isn't in that list? First thing that came to my mind, but it's not something I've been faced with on this scale before.

Edited by spectre6000
Link to comment
Share on other sites

1 hour ago, spectre6000 said:

Is there a reason a pin vise isn't in that list? First thing that came to my mind, but it's not something I've been faced with on this scale before.

I usually end up trying every tool I think may work. 

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • although not in this case.  It was the Lugano Convention and its deficiencies that allowed a Swiss court decision in the first place.  This isnt really a Brexit issue at all.  A decision that affects both the EU and the UK should never have been heard in Switzerland. I bet the authorised service centres in the UK are pretty pleased.  It's a massive shame, though; I believe watch owners should be able to choose to have their watch serviced by whoever they trust.
    • Hi guys I think that old hippy is correct, it opens the gates for china to manufacture aftermarket spare parts. considering that they already do work on behalf of the Swiss I guess this decision gives the a little more legitimacy to tool up and I am sure they will take advantage of the situation either with or without the blessing of the Swiss watch industry  Having read about the protectionist machinations of the Swiss in the history of Europe they were the only ones to get fat at everybody else’s expense. I think the outcome could have been guessed at but ,  fair play to Cousins UK for standing up to them.  Now the question,  will everybody boycott Swiss watches and Swatch, no way they will still fill their coffers.  Me I stick with the Japanese once renowned for cheap shitty watches who came good through industrial effort and don’t for get the Russians that most dismiss as low grade crap. Wouldn’t buy a swatch product ever how about you all.? a
    • Hold the crown when in winding position, move the click away from the crown wheel, and then while holding the crown let it slowly unwind. I recollect that you must remove the automatic device bridge first, but maybe I'm wrong. You can first try without removing the automatic device bridge.
    • nevenbekriev- You nailed it with your description of me and my reaction when the clock started ticking again. I am a newbie.  I love the sound and idea of mechanical clocks but the idea of owning one and trying to keep them running has never appealed to me. My wife bought this one and an antique German wall clock.  When I looked into having someone repair them for me, the universal response was "it's really expensive to work on them, you should just replace the movement". So, I had nothing to lose, I started researching them and opened them up. The wife is happy because she hears the sound of the clocks again. But I have gone down the "accuracy" rabbit hole. In the vertical position, the balance wheel was not floating. It was sitting on the bottom of the frame. I adjusted the lower spring collet and got it floating. It easily passed the 270 degree 3 to 5 minute oscillation test. It took 8 minutes for the wheel to completely stop moving.  I put it the unit back in the movement and checked the safety pin. It does not touch the safety roller anywhere in +/-270 degrees rotation from neutral position. But the amplitude of the rotation with the spring fully wound is weak based on what you are saying. It rotates +/-90 degrees from the neutral position.  No, I did not take the movement completely apart.  That seemed way outside my skill set at the time. There is a reason I became an electrical engineer and not a mechanical engineer. I am much more comfortable with moving electrons than tiny moving metal parts. Will I do it in the long run? Anything can happen. I don't seem to be able to let it go.
×
×
  • Create New...