francis
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My main instrument is: Whatever I'm building...
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Post by francis on Jun 4, 2016 12:11:08 GMT
By the way, did you ever investigate what your spectrum analysis told you? Being more than a little anal, I have worked out that the top three frequencies produced by my soundboard attached to the sides are 150.75Hz (D/D#), 118.43Hz (Bb) and 333.8Hz (E/F) in that order. I see your highest peak is 123.82Hz (which is B); does this mean anything? I imagine that what you really want is a board with equally good response right across the audible frequencies - or would that just be rather bland? (I suspect this is all a red herring so please ignore at will.) Not sure it's really anything more than 'out of interest' at the moment. But this is quite typical of the recordings made with the front attached to the sides:  Lots of flatish peaks, but it sounds good. I've now 'closed' the body but I've taped the K&K to the back of the sound board (twit)!, so can't get more than a clang out at the moment - will see if I can tap the K&K to the end block instead. |
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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 Jun 7, 2016 9:48:29 GMT
Save clogging Robs thread here are some trace sets with the body now closed (unbound and no bridge):  Red traces are taps to the soundboard, blue trace is a single trace to the back. Image below shows there are conflicts in the response between the from and back (white arrows):  |
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davewhite
Luthier / Guitar Maker
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Aemulor et ambitiosior
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Post by davewhite on Jun 7, 2016 11:06:36 GMT
Red traces are taps to the soundboard, blue trace is a single trace to the back. Image below shows there are conflicts in the response between the from and back (white arrows): Does that mean you'll have to send in a "tone faerie negotiator" to resolve things between the front and back ?  |
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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 Jun 7, 2016 13:42:24 GMT
I guess so - forensic's taking too long at the mo  |
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Post by andyhowell on Jun 8, 2016 19:44:34 GMT
Isn't the idea to have the different components all working to different frequencies?
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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 Jun 8, 2016 21:49:05 GMT
Isn't the idea to have the different components all working to different frequencies? Yes. This is playing with things (for me) at the moment, things won't get meaningful until the guitar is in a more finished state. I want to keep the front as free as possible so I'm french polishing that, back,sides and neck will be WB lacquer. These will change the dynamics of the two plates considerably. The bridge too still requires fixing... So at the moment I'm just watching how top response changes at different stages. Might be after a few guitars a pattern emerges, but as this is the first one I've tried to 'see' what I'm hearing/feeling it's just data. Francis |
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Post by andyhowell on Jun 9, 2016 8:44:17 GMT
So at the moment I'm just watching how top response changes at different stages. Might be after a few guitars a pattern emerges, but as this is the first one I've tried to 'see' what I'm hearing/feeling it's just data. Francis A good thread this. Thanks for sharing the journey with us! |
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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 Jun 9, 2016 19:35:30 GMT
Bit of a binding day today:  With purfling matching the rosette rings:  Still some tidying up on the bindings to do, also been working on the bridge today - roughing out the shape and installing the bass reinforcement to the string anchor points. Francis |
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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 Jun 10, 2016 13:04:38 GMT
The bridge: After initial shaping and clean-up, saddle slot(s) will be cut later when intoning strings.  Rough positioning for distance and angle. Changed the design - now using thro holes rather than the initial slots - just changed my mind when it came to cutting the slots.... |
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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 Jun 10, 2016 17:27:47 GMT
That looks like a proper guitar, francis . Beautiful. I see you lost your nerve when it came to slotting the bridge. I think you might be right; my slots are in line with the grain so they don't really do much to the structural integrity of the bridge. Cutting across the grain would be a bit more traumatic! Also a good idea to arrange for the ball-ends to pull against brass even if it does add a bit of weight to the bridge. Keep up the good work. ps You've inspired me...  |
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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 Jun 11, 2016 9:32:02 GMT
... good idea to arrange for the ball-ends to pull against brass even if it does add a bit of weight to the bridge... ps You've inspired me... Thanks Rob, the brass tube is 5mm OD and thin walled so no real weight to worry about. If building a classical I'd be concerned but the rosewood bridge on this is quite chunky at the moment and that will change when I true the base to the proper curve of the soundboard (20 ft radius). Beginning now to think about starting on the neck and getting the heel and scarf joints clamped up. As for inspiration - I'd look more towards Rosie - lots of interesting stuff going on there... |
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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 Jun 16, 2016 21:47:08 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 Jun 17, 2016 14:39:47 GMT
Few days away and a few panics later I've managed to rough out the neck, fit the two way truss rod, two carbon strips and fit it to the body. Fretboard is still in need of a trim.   Coming on gradually.... |
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davewhite
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Post by davewhite on Jun 17, 2016 15:40:20 GMT
Looking good |
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Post by earthbalm on Jun 17, 2016 17:01:02 GMT
Looking very good indeed.
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Jo whoever he is.
