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RE: Bogdanovich´s method for flamenco guitars
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RobF
Posts: 1425
Joined: Aug. 24 2017
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 RE: Bogdanovich´s method for flamen... (in reply to mango)
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quote:
Do you use a circle cutter to cut the channel into the soundboard? Does it work with a router as well? Standard router bit?
Hi Mango. Sorry for the late response, I haven’t been on the Foro and missed your question. If it’s not too late, I’ll throw in my two cents...
Either router or blade is good, the main concern when cutting the channel is to not mess up the edges. If a blade is used always run the cut with the grain. If a router is used then a spiral down-cut bit works well. It can be a good idea to sneak up to the edge with multiple cuts, especially when the bit gets older and is not as sharp.
I’ve tried all the installation methods mentioned in the earlier posts and each method has its good points and bad. At this point, I like doing it with individual channels.
The tape method works well and is really just a variation on how a premade rosette is installed. The fit benefits from being kept a very small amount loose. Working gently from the edges while not applying any pressure at the centre until the full rosette is inserted is the key. Keeping the edges glue free is also important, as the glue will swell the wood and make the channel tighter. Care must be taken not to force anything and avoid collapsing the wood at the edges of the channel. The edge of a ruler or stick can be used to push the rosette edges sideways to give some more space. It’s better to remove the rosette and start over if trouble arises.
Installing the components dry and then fixing with ultra thin CA can also be done. If there is any concern about the bottom not getting enough glue, a few very small holes can be drilled through the the rosette channel and the glue then applied through the holes from the back. A rosette patch can serve to cover these holes afterwards. It is very important, if this method is used, to not get any CA into the space between the top and the outermost veneer strips of the rosette. CA will discolour both cedar and spruce if it soaks into the end grain. To seal that portion, either use hot hide glue or apply a wash coat of shellac first before applying the CA.
Using separate channels has more steps and takes longer to do but it removes a lot of the stress from the process. A few other advantages are - the border routes can clean up the edges of the mosaic tiles, it allows experimentation with different border schemes before committing to glue, and a good snug fit can be made for the borders, which leads to a nice, crisp looking result. If this method is used it’s a good idea to clamp the top to the workboard and not move anything until the entire job is done. Any movement of the pivot pin in relation to the top can throw a subsequent circle cut out of alignment with the previous.
There’s lots of other ways to do this, too. Same with mosaic tile making, lots of ways to do it. Some are more production oriented and are geared to making a lot of rosettes at once. It’s good to try the different methods as you come across them and then settle on the one that works best for your own circumstances. I guess that applies to pretty well every step in the guitar making process.
P.S. I didn’t watch any of the videos referred to in the previous posts, so please forgive if I’m just restating stuff already covered in them.
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REPORT THIS POST AS INAPPROPRIATE |
Date Dec. 13 2019 15:45:42
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ernandez R
Posts: 633
Joined: Mar. 25 2019
From: Alaska USA
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RE: Bogdanovich´s method for flamen... (in reply to RobF)
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Really cool how you took your rosset idea, stuck with it, and had it come out so well.
Tom, no worries, Mango has many ways to get some blood, I mean red into that guitar somewhere ;) : blood sweat and tears.
Disappointed in the back though, I was invisioning a smaller version of your rosette going down the middle... May as well make an extra piece to put over your tie block and down the middle of your headstock veneer... Just take a moment to split that back with a sharp knife, square it up on the shooting board, and glue in that back strip.
Enjoying your progress, keep up the good work,
HR
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REPORT THIS POST AS INAPPROPRIATE |
Date Jan. 24 2020 3:29:45
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