Jump to content

Black Slate Renovation?


Blacklab

Recommended Posts

Hi All,

Here is something that I found on the Marblack that might be useful, I think it was from M&P.

Clockboys pdf is also very good. I was never keen on using the polyfiller to stick, I always used good quality plaster of paris.. Although NEVER use on dry slate that you have just renovated because once you put on a thin layer you don't have much time to sit and set, before the water is drawn out and it has stuck firm, you will never get it apart, I always wet and let the water soak in a few times on the slate first so that it gives a little more time to move and line up properly, don't worry about any that messes your slate it easily cleans off.

A NO NO is to never use apoxy resin, use that and make your clock worthless, no matter how hard you try to be careful it will ooze out and seal the pores of the slate and WILL show up badly when polished..

Len

 marblack1.pdf  

 

Link to comment
Share on other sites

  • 3 years later...

First, may I apologise for posting on a rather old thread.  If anyone feels able to help with my problem, I would be most grateful.
I havde a number of black "marble" clocks with French movements, so their cases are probably Belgian Calcite.  Due to being kept in a damp room, they were attacked by mildew and peppered with white spots.  I have used "Cherry Blossom" black boot polish to remove much of the spotting, but it is still very noticeable.  "Kiwi" boot polish comes in two varieties - one is the "ordinary" type and the other "Parade Gloss".  When I last came across the latter, many years ago, I recall it having a strong smell of turpentine.  Would this "Parade Gloss" boot polish, if it is still available, be worthwhile?  The cases do not have significant white bloom, just the spotting caused by the mildew.
Any suggestions would be most welcome.

Link to comment
Share on other sites

Hi  and welcome to the forum,     If the spots are well noticeable you will have to rub the cases down to remove them.  Mildew is a fungus therefore organic. You could try a propriety brand of mildew remover firstly having removed all the cover up material (boot black  etc) with white spirit. If that fails then rubbing down is the only other method.  attached document to help you.

5a663b9f0c202_MarbleCaseRestoration (1).pdf

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

    • As an experiment i was thinking of not hardening it to see how it fairs. Now that i have a complete template i could knock up another in half the time if this loses its elasticity. I might play about with a few pieces today to test their bending and spring properties. This was cs 100 the supplier quoted in annealed state, it was nice to work with files so I'm taking it thats its state. What you are looking seems like it would need annealing to work it. This is why i went for this stuff that cuts out that process, it was so easy to work.
    • Showing state of hairspring on receipt, backplate & 'dished' wheel.  Thanks, Nev. Amplitude v. weak - balance wheel turns over arc of only ~20deg. Don't know how to calculate movement rate or safely vibrate balance spring! Meantime I have reduced the 'dishing' & clock no longer runs for more than a few minutes except face down which supports my theory that it was 'dished' as a hack to avoid doing a proper repair.
    • I would harden and temper (to a light blue). It's so easy to do and only takes a couple of minutes. A search on ebay UK for "spring steel strip cs" finds plenty available in small quantites and thicknesses from 0.1mm up.  But the question is ( @nickelsilver) which "CS" number is best for watch parts ?  Also, from one of the ads : "CARBON SPRING STEEL. SIZE IS METRIC 15.00mm X 0.10mm X 304 MM  CS100 FINISH BRIGHT . HARDENED AND TEMPERD TO 480-530VPN" I've no idea about 480-530VPN. Does that mean it needs annealing before working?       Have you seen this video, he shows how to determine where the indents go ?  
    • Here is the insert ring for rectangular or elliptical movements: Note that the length is the side with the stem cut out on the spreadsheet (in the picture below this is 15.15: Here is the fake pdf file, again you need to convert to .zip after download to access the FreeCAD and 3mf files. Rectangular insert disc.pdf    
    • as you took the mainspring out what did it look like? It's amazing how much amplitude you can get if the mainspring actually has the proper shape. last week I was doing a 12 size Hamilton and was very much surprised with the beautiful back curvature the mainspring had. Then the watch had a really nice amplitude the group would be so proud it was 350 until I dropped the lift angle down to 38 that drop the amplitude quite a bit below 300. then with the beautiful back curve it still had really nice amplitude the next day. I really wish all my mainspring's look like this as the watch had beautiful amplitude the next day. So many of the aftermarket pocketwatch Springs I see now do not have anything resembling a back curve may be a slight curve and that's about all. They still work but they just don't work as nice as a properly made spring. then Omega as all sorts of nifty technical documentation unfortunately every single corner is watermarked with where it came from who downloaded it etc. very paranoid company. On the other hand I will snip out images like from the document on recycling a mainspring barrel. for instance here's the section on what your mainspring should look like. water damaged a lot of times means rust was there rust on this watch?
×
×
  • Create New...