davewhite
Luthier / Guitar Maker
Luthier
Aemulor et ambitiosior
Posts: 3,548
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Post by davewhite on May 21, 2016 15:36:27 GMT
Have you noticed, by the way, that nobody on the planet has worked out how to remove the strange numbered labels from these spring clamps? I've never seen a bare one. On the contrary, they are individually marked so that Francis can track them via GPS  |
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francis
C.O.G. 
Posts: 2,482 
My main instrument is: Whatever I'm building...
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Post by francis on May 21, 2016 16:12:29 GMT
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francis
C.O.G.
Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 22, 2016 9:57:53 GMT
Linings are certainly rigid and ring quite well when taped! - good start. Forming the cutaway:   |
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francis
C.O.G.
Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 23, 2016 9:59:38 GMT
Bridge mock-up in Photoshop Pinched Rob's slotted design but to combat string wear I'll add a half section of brass tube along the back edge so the ball-ends locate on a metal rather than timber surface. That also gives me more options for bridge timbers as they don't need to be mechanically as strong...  |
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on May 23, 2016 10:29:29 GMT
Here's where I originally got the idea from; funnily enough yours looks more like his arrangement that it looks like mine.
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francis
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Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 23, 2016 10:56:41 GMT
Here's where I originally got the idea from; funnily enough yours looks more like his arrangement that it looks like mine. It was the use of the slots to locate the strings rather than the overall 'look'. I've also mocked up the rosette: Bridge to the left hand side  Francis |
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on May 23, 2016 11:21:45 GMT
I've found it quite difficult to get the soundboard to run through the printer but it looks great if you can do it. Presumably the asymmetry fits in with the general "tilt" of frets and bridge etc.
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francis
C.O.G.
Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 23, 2016 13:57:47 GMT
I've found it quite difficult to get the soundboard to run through the printer but it looks great if you can do it. Presumably the asymmetry fits in with the general "tilt" of frets and bridge etc. It's just my twisted nature!  Glued up some test (or real if they work) - brace laminations |
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francis
C.O.G.
Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 24, 2016 7:32:24 GMT
They seem to work well - very stiff: Arrangement has changed:  The laminations are Spruce 2.1mm / Sapelle 2.0mm / Spruce 2.1mm bonded with Cascamite aginst a plywood former. the shallow curved braces were sprung to shape without any pre-bending - they sprung slightly on release from the former. The tighter curves were pre bent on a hot pipe and retained their shape on release from the former. The spring-back was about 7mm from the drawn line on the body plan. The depth of the braces at present are 8.5mm with square corners. These will be tapered away from the bridge and top faces rounded. Still to make the UTB which will be taller. As I'm not using bridge pins to secure the strings I may add a small centreline brace behind the bridge and a small triangular pad between the bridge and sound hole... Francis |
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davewhite
Luthier / Guitar Maker
Luthier
Aemulor et ambitiosior
Posts: 3,548
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Post by davewhite on May 24, 2016 8:26:23 GMT
Francis, Gore blimey - looks like you've got your own space time vortex Is this a falcate foray ? I hope you find the frequency responses you are looking for  |
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Post by scripsit on May 24, 2016 8:49:20 GMT
Francis
In the Gore iteration, I think the bridge plate/top/bridge sandwich is an important part of resisting the twist into the sound hole, with carbon fibre reinforcement under the bridge itself. You may want to consider a hefty brace or plate in your all wood version.
Kym
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francis
C.O.G.
Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 24, 2016 9:00:21 GMT
Dave - Yes it's a falcate foray (a la Milsom) I'm not using any CF in this or epoxies and as for the right frequencies I'll be tuning this soundboard as my others by aiming for a good ring when tapped and long sustain.
It didn't start out that way (see design thread) but I didn't like the placing of the braces with the angled bridge. Also changing to a bridge that didn't need a bridge plate gave me more freedom. I remembered seeing images of this brace pattern a while back. References to the Gore/Gilet book (which I'm waiting for) via the net gave me lots more images from various makers. The CF/epoxy looked very messy to me and the way some were placing the CF didn't look to be doing a great deal. I thought I could get similar results by laminating the braces. Time will tell.
(the image above should be flipped vertically as it's layout shows a left-handed orientation - whereas it's for a right hand config).
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francis
C.O.G.
Posts: 2,482
My main instrument is: Whatever I'm building...
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Post by francis on May 24, 2016 9:17:56 GMT
Francis In the Gore iteration, I think the bridge plate/top/bridge sandwich is an important part of resisting the twist into the sound hole, with carbon fibre reinforcement under the bridge itself. You may want to consider a hefty brace or plate in your all wood version. Kym Thanks Kym, Wasn't aware that there was CF in the bridge area, as notes earlier I had thought about a pseudo bridge plate something like the shaded area below... _  |
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on May 24, 2016 9:41:48 GMT
Thought it looked familiar, Francis!  |
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Post by scripsit on May 24, 2016 9:51:45 GMT
Wasn't aware that there was CF in the bridge area, as notes earlier I had thought about a pseudo bridge plate something like the shaded area below... _ Francis There is a bridge being constructed here which pretty much follows the suggestion in the Gore 'build' book. So with the carbon mesh and several layers of wood there is a bit of strength being laid down. www.anzlf.com/viewtopic.php?f=1&t=6081&p=71074&hilit=staining+bridge#p71074Your notion looks like it would do the job. Kym |
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Jo whoever he is.
