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PostPosted: Sun Aug 07, 2016 8:04 pm 
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Joined: Sat Apr 10, 2010 10:50 pm
Posts: 2281
Location: Seattle
I built this as a commission, although I told the client that it was an experimental build as it was my first 12 string. I did use a lot of information from the Gore\Gilet books including the bracing pattern and bolt on\off neck design. The body is the Gore medium size steel string. I followed a tutorial from Craig Lawrence on the Australian\New Zealand Luthiers Forum for the 2 string per pin bridge. Richard Woods (Woodsy23 on also on anzlf) modified and ran an existing Finite Element (FE) model he had, for 12 strings load, both light and medium (EJ38s and EJ39s). He determined I would need to increase the height of the falcate braces to 10 mm for the EJ38s and 11 mm for the EJ39s. I ended up with 10.5 mm as I wanted to limit the monopole frequency of the top to keep it in the typical SS range. I ended with 175 Hz top frequency (that I may work to lower to 170 Hz). I have a spectrum analysis with strings at the bottom of this post. I did not measure the bridge rotation under load, but it looks good to my eyes.

The top is Lutz Spruce, back and sides Ziricote.
Bridge BRW, Fretboard EIR, Ebony bindings
rosette, Headstock, backstrap, end wedge, heel cap and side purfling are all Koa.
Finish: EM6000 on zpoxy fill for the body and CA fill and Royal Lac for the neck and head stock.

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Last edited by johnnparchem on Mon Aug 08, 2016 4:01 pm, edited 1 time in total.

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PostPosted: Sun Aug 07, 2016 8:20 pm 
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Joined: Wed Nov 26, 2014 7:52 pm
Posts: 296
Location: Saint Paul, MN
Gorgeous John. A beautiful instrument. I hope it sounds as good as it looks!

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PostPosted: Sun Aug 07, 2016 8:24 pm 
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Joined: Mon Jul 28, 2014 7:50 am
Posts: 425
Location: Chadds Ford, PA
Nice looking guitar. How would you characterize the sound? (fundamentals, overtones, midrange, sustain, etc.)


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PostPosted: Mon Aug 08, 2016 9:06 am 
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Joined: Mon Aug 30, 2010 11:23 am
Posts: 224
Location: Nova Scotia, Canada
Beautiful work!


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PostPosted: Mon Aug 08, 2016 3:39 pm 
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Joined: Sat Apr 10, 2010 10:50 pm
Posts: 2281
Location: Seattle
Thanks guys! Here is an you tube line with my guitar instructor Rob Hampton of http://www.heartwoodguitar.com/ playing my 12 string

Link if embedded player does not work: https://www.youtube.com/watch?v=UebH85F4PAU


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Last edited by johnnparchem on Thu Aug 11, 2016 11:01 am, edited 1 time in total.

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PostPosted: Mon Aug 08, 2016 9:11 pm 
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Joined: Mon Aug 30, 2010 11:23 am
Posts: 224
Location: Nova Scotia, Canada
Sounds great!


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PostPosted: Sun Aug 14, 2016 7:05 am 
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Joined: Sun Mar 09, 2014 8:13 pm
Posts: 1319
John, that is simply wonderful. Your work is precise. The woods are outstanding. congratulations on a superb build.


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PostPosted: Sat Aug 20, 2016 11:43 am 
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Joined: Sat Apr 10, 2010 10:50 pm
Posts: 2281
Location: Seattle
Thank you Phil and Diane

The new owner dropped by my house to pick it up. He was very happy with the guitar and played it for my wife and me for about an hour. It is fun to build for a real player.

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angel (377).jpg


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