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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 1:13 pm 
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Cocobolo
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Wow, Jim, that is simply superb. I'm especially intrigued by the X-fan bracing.


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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 1:24 pm 
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All - Wow, thanks for all the encouraging words!

Larry Davis’s web site is: http://www.galleryhardwoods.com/knife.htm . He primarily sells these as knife scales I believe.

The bracing is actually capped at the X and I referred to it as flying as there is a window between the top of the brace and the top itself, hence the brace “flies” up off of the top in a few spots allowing the fans to pass through uninterrupted on the bass side. Perhaps windowed brace would’ve been a better term.
More bracing notes:
This last year I was in a pretty experimental mood and did a bunch of different stuff both building and computer studies, so I was open to trying things that I could make sense out of.
The bracing came about through a conversation with Jeff Elliot and more information on it can be found in the GALs Big Red book #3. There’s some harp guitar stuff in that one which is where Jeff originally used it.
If anyone has read or attended Dana Bourgeois’ papers or talk at the GAL conference, you will remember he talks about tapping and wanting many distinct notes emanating from the top. This bracing pattern pretty much forces that to happen with the progressively longer fans and “flying” X.

The back of the headstock: you guys are right. Cut a pocket, install the purfling before installing the piece to be inlaid then inlay the piece. This piece is pretty thick about .1 and helps create a sandwich structure out of the peghead. It also has Carbon fiber extended up into the peghead from the neck shaft.

All the purflings on the instrument are dyed maple B/W/B, from LMI.

Trevor - I did do a FEA on this top to see what would theoretically happen modal wise and get some structural data from.

Andy – The only Hardware for the bridge you need is some .078 music wire which you can get at hardware or hobby shop and some #1 washers. The strings slip over pieces of the music wire that are drill at a back angle, between the angle and the tension the strings stay put. The wire is glued into a mating hole that goes through the bridge and all the way down through the bridge plate., so in essence it's a "pinned/pinless" bridge. You also need to make some fixtures to drill some funky angled holes. Mike Doolin has an article hidden on his website that describes how to do it., if you e-mail Mike I’m sure he’ll send you the link. As it’s hidden on his website I don’t feel comfortable posting it here with out his permission, I’m sure you understand.

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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 5:28 pm 
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feels like i'm piling on, but i'll do it anyway - totally love the way the guitar looks. and i want to hear more about your thoughts with the fan bracing.
phil


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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 6:01 pm 
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hi Jim
you've brought together some interesting elements here, the bracing and bridge especially.
I admire your adventurous attitude and tasteful execution.
Looks like a real nice piece o' carpathian on it to, is it am OM size / shape.
Do you have a picture of the back?.
yours Geordie

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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 8:03 pm 
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Outstanding Jim! Love that headplate treatment...

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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 8:22 pm 
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Stunning!

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 Post subject: Re: just finished
PostPosted: Fri Jan 30, 2009 11:49 pm 
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Beautiful work as usual, Jim.
Lovely guitar!

Steve

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 10:25 am 
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Beautiful guitar, Jim, and superb craftsmanship! I've got some questions if you don't mind. Did your computer modeling lead you to think this was the best of your experimental designs? Also, how does the tone and volume compare to other standard x-braced guitars you have made? I see that the open sections of the x-brace and the fans are not symmetrical. Do you think that helps promote the transmission of the many distinct notes you are listening for?

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 4:01 pm 
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Ken, I don't actually think I could tell what the "best" is based on computer modeling. It has the same limitations as the guys looking at the Chladni patterns on their tops. That is, you need to know what the right pattern is and how strong the individual modes should be.
What I did notice in the model, was what I thought was a nice distribution of modal patterns between 200 and 1000 hertz (top fixed to the ribs not a free plate). Also the top seemed to be dynamically "looser" on the bass side and "tighter" on the treble side. So I wanted to hear what this sounded like and build a prototype, I really liked it. A gentleman who had a guitar on order with me got to play the prototype and wanted to change his order over to this style of top. A hit as far I'm concerned :)

I still have more modeling to do, but I think the modeling effort has improved my guitars in general and increased my understanding of guitar mechanics.

I think that this bracing style really helps with the distinct notes on the top. Each fan is different on the top both in length, width and height. Long, low, fat ones on the bass side, and short, skinny, tall ones on the treble side.

As far as sound: I'll try to do this as best I can, it's very difficut for me to describe sound, but here goes. BTW: whats Red look like? ;)
When it come to sound what I'm looking for is a guitar that has a large dynamic range, that is it responds well to a light touch and is not over driven when played hard. Volume ties into this, but is not necessarily the same, so I also want the guitar to be able to be loud. I'm looking for a lively sound, I want to hear lively bass notes not dead bass notes. Also, I want clarity and balance up a down the finger board.
So based on the above I'd have to say that this is a successful instrument. It's my impression after building a couple of these (not a large sample admittedly) that it meets my criteria better than a standard X braced guitar.

Charlie Would has topic going on tone and how long it takes to break a guitar in. So if you see this Charlie my guitars take a couple of days to really come alive. When I first string up, I'm almost always disappointed, after a half hour to an hour very noticeable changes occur, after a day things are really starting to cook, So the sound changes radically at first and then settles down after a week or so.

Geordie - I'm having trouble getting a good picture of the back, If I get one I'll post it.

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 4:42 pm 
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Love your guitar,

I'm curious, what code do you use to do the finite element analysis? Is it a proprietary program that is designed to do FET, or do you code it all yourself?

I'm a bit interested in FET myself.

Thanks for all the inspiration!

STefan


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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 4:52 pm 
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Very classy, I like it. I'm very intrigued by the bridge and think I may want to try one sometime.

I'm curious about the soundport as it seems to be fairly large. I wonder if this provides a louder response for the player and if it is necessary to reduce the size of the soundhole to compensate. If I remember correctly, soundports of about 1.5 sq. in. area don't require any changes in the soundhole diameter; just wondering what happens when they get significantly larger.

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 9:35 pm 
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Stephan, I am running Cosmos inside of SolidWorks.

Steve - I do not compensate the sound hole diameter. As near as I can tell the main benefit of the sound port is to the player. my sound port is in the 2.5 sq. in range.
Thanks for the kind words.

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 10:03 pm 
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For those that wanted to the back, this the best pic I could get.

Attachment:
sp-back.jpg


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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 10:16 pm 
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Great work Jim!!

Love the bridge, well done! [clap]

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 10:23 pm 
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Beautiful guitar Jim. Stellar work!

Ken

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 11:26 pm 
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yeah, i just want to echo what everyone else said. quite an amazing guitar. simple and elegant, just my style. i didnt get a chance to read every post so maybe someone already requested a sound clip, but my WIFE wants to know what it sounds like.

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 Post subject: Re: just finished
PostPosted: Sat Jan 31, 2009 11:58 pm 
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Hi Jim, I'm new to the board. Just finished building my first guitar. What an incredible experience! After looking at your pics for your recent build, I was amazed at the level of detail in the design. I absolutely love the back of the headstock, it's just beautiful! How does this sound with the bracing pattern you've used as compared to a standard x-brace design? Great job!


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 Post subject: Re: just finished
PostPosted: Sun Feb 01, 2009 12:08 am 
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Dennis, welcome to the forum!
I tried to answer the sound question about half way up this page.
Thanks

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 Post subject: Re: just finished
PostPosted: Thu Feb 05, 2009 10:20 pm 
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Hey Jim, Can you tell me what tuning machines you used on this guitar? Thx. Dennis


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 Post subject: Re: just finished
PostPosted: Thu Feb 05, 2009 10:38 pm 
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Superclassy.

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 Post subject: Re: just finished
PostPosted: Thu Feb 05, 2009 10:52 pm 
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Dennis,
They're the Goto 510's in the black finish.

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 Post subject: Re: just finished
PostPosted: Thu Feb 05, 2009 11:07 pm 
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Jim, wow! I love it! The back of the peghead is especially cool. Dang!

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