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Thread: Rub-over cabochon help

  1. #1
    Join Date
    Aug 2023
    Posts
    7

    Default Rub-over cabochon help

    Hi Experts,

    I hope you can see the attachment? It shows a rub over ring blank with an open back, and a stone that fits pretty well inside it. The stone does not sit flush, it's a couple of mm proud. I bought these from Cookson a while ago as a "fun" personal project but I'm having a bit of trouble getting it to work.

    Click image for larger version. 

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    I've annealed the ring twice and just can't get the metal to budge at all around the stone. I can see very tiny spaces where I've been trying to push the metal towards the stone. I'm using a notched pusher as I read that these were more effective for this kind of thing.

    It obviously needs to be a snug fit but I can't see how.

    Do you have any suggestions? At the moment it's solid and I'm not getting anywhere with it.

    Should I be glueing the stone first or something? I've used bezels with limited success before but this is quite different.

    Any help would be appreciated!

  2. #2
    Join Date
    Oct 2016
    Posts
    129

    Default

    I use a hammer handpiece for these types of rings. I usually put a bit of superglue in the back to hold the stone while I hammer set it and then drop it in acetone overnight to get the glue offClick image for larger version. 

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ID:	13579 . I will also add that a high dome cab isnt really suited to this type of ring.

  3. #3
    Join Date
    Aug 2023
    Posts
    7

    Default

    Quote Originally Posted by J Allison View Post
    I use a hammer handpiece for these types of rings. I usually put a bit of superglue in the back to hold the stone while I hammer set it and then drop it in acetone overnight to get the glue offClick image for larger version. 

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Size:	13.4 KB 
ID:	13579 . I will also add that a high dome cab isnt really suited to this type of ring.
    Thank you, I appreciate your helpful reply!

  4. #4
    Join Date
    Dec 2009
    Location
    Central London
    Posts
    8,848

    Default

    You might have more success if you created a set up that allowed you to push harder.
    Hold the ring by the shank in a wooden ring clamp with a screw. Then rest the bezel against something fixed, such as a bench peg, or the edge of the bench itself. This will allow much more heft.

    Use a plain ended bezel pusher, the end roughened a bit with sandpaper to stop it slipping.

    You can also recruit a partner to do the holding, while you use a plain setting punch and a light hammer. Concentrate first on four opposite ponits to hold the stone, and then refine the setting.

    The punch can be made from a piece of steel rod, or even a six inch nail.

    https://www.cooksongold.com/Jeweller...B&gclsrc=aw.ds Dennis

  5. #5
    Join Date
    Aug 2023
    Posts
    7

    Default

    Quote Originally Posted by Dennis View Post
    You might have more success if you created a set up that allowed you to push harder.
    Hold the ring by the shank in a wooden ring clamp with a screw. Then rest the bezel against something fixed, such as a bench peg, or the edge of the bench itself. This will allow much more heft.

    Use a plain ended bezel pusher, the end roughened a bit with sandpaper to stop it slipping.

    You can also recruit a partner to do the holding, while you use a plain setting punch and a light hammer. Concentrate first on four opposite ponits to hold the stone, and then refine the setting.

    The punch can be made from a piece of steel rod, or even a six inch nail.

    https://www.cooksongold.com/Jeweller...B&gclsrc=aw.ds Dennis

    Thanks Dennis, that's really helpful!

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