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Double bevel or Boulle for bent marquetry?

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Forum topic by fazhou posted 01-03-2018 03:55 AM 332 views 0 times favorited 3 replies Add to Favorites Watch
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fazhou

14 posts in 1708 days


01-03-2018 03:55 AM

I am in the planning stages of making a Viola D’amore. It is a bowed instrument similar to a violin or Viola da gamba. I have most of the construction details nailed down and now I’m thinking about decorations (V’das are baroque instruments and often have ornament). The fingerboard is usually made of ebony veneer, about 1.5mm thick, that is glued to a spruce core. The ebony often has marquetry of some sort. I am familiar with the concept of marquetry but not specifics. Keeping in mind that the spruce core is arched, would one style of marquetry lend itself more readily to the task? Any and all advice that you care to offer, including how to glue the veneer would be most appreciated. Normally, the veneer is wet on one side, heated on the other until it cups. Then it is lashed to the spruce core to dry. When dry, it’s unlashed, glued, lashed again. I’ve attached two photos that might help explain. One photo is of the tailpiece but the idea is the same. Thanks for your time.


3 replies so far

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shipwright

8062 posts in 2914 days


#1 posted 01-03-2018 05:10 AM

If you are familiar with both styles I you could use either. Boulle would leave a kerf and double bevel (conical) would not, however having the blade square to the work (Boulle) would make the fine detail easier as sharp corners are not as easy in conical cutting and you have many very fine ones.
The motif lends itself well to Boulle style and I think it would be my choice. If I were making more than one, I would likely use the piece by piece technique which would allow the sharp corners and I could avoid kerfs at the same time.
However for just one my choice would be Boulle.
Others may disagree ….

-- Paul M ..............the early bird may get the worm but it’s the second mouse that gets the cheese! http://thecanadianschooloffrenchmarquetry.com/

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fazhou

14 posts in 1708 days


#2 posted 01-03-2018 12:28 PM

Thanks for the reply shipwright. I totally see your point about the detail. The motif in the photo is not exactly what I would use but similar. I’m correct in assuming that Boulle can be done with a scrollsaw, correct? Although I would love to have and build a Chevalet similar to yours, I have too many instruments to build. How would you go about gluing down something like this? Is there a book that you would recommend that might help?

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shipwright

8062 posts in 2914 days


#3 posted 01-03-2018 03:48 PM

I would make a caul the same shape to clamp with and use a compressible pad in between to make equal pressure over the whole surface and then clamp it either in a press or with simple C clamps.
Absolutely use hide glue. In this case liquid hide glue may be better than hot for open time.

Yes you can cut it on a scrollsaw although the control would be better with a chevalet.

-- Paul M ..............the early bird may get the worm but it’s the second mouse that gets the cheese! http://thecanadianschooloffrenchmarquetry.com/

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