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Archtop build - refining recurve once strung http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=56640 |
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Author: | Darrel Friesen [ Mon Jun 17, 2024 6:57 pm ] |
Post subject: | Re: Archtop build - refining recurve once strung |
I’m no pro but have built a couple of acoustic archtops with floating and K & K pickups as well. They compete very well in an acoustic jam. Dimensions and construction tips were generously provided by Bill Moll on the MIMF way back when. These are 20” lower bouts with 4” ribs. The recurves are scraped to about the same thickness, say 1/8” to what you appear to have as a starting point so I can’t say if thinner will help you without it getting a floppy sound for lack of a better description. Good luck in trying to go any thinner with the size of body you’re working with. I would not be as as adventurous to go thinner myself. |
Author: | Ken Nagy [ Tue Jun 18, 2024 8:48 am ] |
Post subject: | Re: Archtop build - refining recurve once strung |
I do a lot of area tuning. It doesn't take very much stock off at all. Just use scrapers. I tap the top, and back; lightly, and find high spots. Scrape the highest spot, lightly, and test again Keep doing it until it is all pretty even. If you didn't do this on the inside on your braces, they might be high over them. Yours don't look like they will be too bad. I've never used cross braces, my arching is already made with diagonal arches. I've only used parallel braces on arch tops, and ladder braces on other guitars. I don't know anything about them. I would guess on an archtop they magnify the arching that is already there. The highest tapping areas, and your most work, will probably be around the edge; but high spots can be anywhere.. Don't tap over the linings; go a ways inside of the linings. The same with the blocks. Don't spend a lot of time in one spot. Tap to see if there is a ridge of highs, or just a peak in on spot. After you've done some, since yours is set up; you can play and see if some of the notes are more clear. If it isn't doing anything, then check again all over, and see if there is something that you missed. If it is all even, I guess that is how it sounds. If it sounds better, then check all over again, and see if there is something that you missed. It could get even better. You should be only taking little shavings. There is at least one guy who does cellos, and checks each note. If a note is weak, he finds where a glob of blue tack makes the note better. Then after checking to see if it makes any note noticeably worse; he thins it there. I have not experience with that. I do know that tuning the belly for a tiny use sized Baroque guitar, free plate; I can hold it in different places all around the edge, and tap out chromatic notes. It isn't glued on, but is sounds promising. One last thing. I'm thinking that after sealing, you should go over it again. Then re-seal the scraped parts and check it. Some parts may soak in more sealer, and change the stiffness some. I only did this on the last viola I did. |
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