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Fitting pieces together

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DC:
Sometimes you have to fit two odds shapes together. Like the long curve when doing a patch in a limb or maybe a tighter curve in the handle. How do you get a nice glue line? I've seen violin makers using chalk and rubbing the pieces together and others using graphite(pencil) the same way. Not sure if I'd trust a glue joint that was coated with graphite. Any YouTube links? Any hints? I've searched YouTube but I don't think I've gotten the right search criteria.

Pat B:
DC, with handle splices you can boil both pieces, clamp them together and let them dry. This will help to match the glue surfaces for better glue lines. Whether this will work for other splices I can only imagine it will.

DC:
Thanks Pat. The one I'm working on right now is a repair so one side already has some glue joints that I wouldn't want to steam. It just occurred to me that there is no reason not to steam or boil one piece and clamp it to the other though. Good idea. May not work that well with thicker pieces though.

Eric Krewson:
I saw a neat trick on a flintlock site where a guy used carbon paper between to pieces of wood to mark the high spots to get a perfect fit.

I shine a light behind the pieces and look for light coming through to see the high spots. This only works if your added piece goes all the way through the wood.

I eyeballed this patch on a badly cut precarve flintlock lock panel, it took me hours to get what I thought was a perfect fit, and it was. I am pretty sure I shined a bright led light inside the mortise and looked for gaps on the outside. As you can see, the lower glue surface was snaky, not straight.

Eric Krewson:
done

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