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 Post subject: SM HD28 Plan
PostPosted: Mon Jul 15, 2019 9:50 am 
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Koa
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This is the plan I'm building to. Does anyone know if this is a forward shifted design? How can I tell?

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"Alan Carruth, IMO the 12-fret 000 or 14 fret OM size (15" wide lower bout) is god's size for the steel string guitar, especially for fingerstyle. I would also try to get away from scalloped bracing and lean toward 'straight' or 'tapered' bracing. Scalloped emphasizes bass and 'punch', where straight bracing, and especially 'tapered' (sometimes called 'parabolic') leans more toward treble and sustain."


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 Post subject: Re: SM HD28 Plan
PostPosted: Mon Jul 15, 2019 9:57 am 
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When I was researching the design for my first dreadnought type guitar, I came across this figure:

Attachment:
Forward shifted vs standard x-bracing layout.jpg


The figure is from an article on StewMac's website: https://www.stewmac.com/How-To/Online_Resources/Learn_About_Building_Instruments_and_Kits/Banjo_Killer_The_scoop_on_forward_X_bracing_for_greater_guitar_volume_.html


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Last edited by J De Rocher on Mon Jul 15, 2019 10:41 am, edited 1 time in total.


These users thanked the author J De Rocher for the post: DanKirkland (Mon Jul 15, 2019 12:05 pm)
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 Post subject: Re: SM HD28 Plan
PostPosted: Mon Jul 15, 2019 10:24 am 
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I think the number you want is from the body/neck join to the intersection of the X braces. Should be close to 9"+ but I would go to the UMGF and search what people over there
have documented.


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 Post subject: Re: SM HD28 Plan
PostPosted: Mon Jul 15, 2019 11:38 am 
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I don't think it's forward shifted.

Here's another thread about that plan you should look at regarding the bridge plate.

viewtopic.php?f=10101&t=51520&hilit=bridge

Kevin Looker

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These users thanked the author klooker for the post: DanKirkland (Mon Jul 15, 2019 12:09 pm)
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 Post subject: Re: SM HD28 Plan
PostPosted: Mon Jul 15, 2019 5:15 pm 
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Based on John Arnolds tracing taken from his original 1937 Herringbone 1"-3/16" from the lower edge of the sound hole to the center of the X. This has been my blueprint for my Dreadnought guitars not sure how it compares to any others.



These users thanked the author Clinchriver for the post: SteveSmith (Mon Jul 15, 2019 7:01 pm)
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 Post subject: Re: SM HD28 Plan
PostPosted: Tue Jul 16, 2019 7:42 am 
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How consistent is the sound hole location on Martin Dreads through the years. My experience is that the sound hole diameter is very consistent at 4". But I have not measured the distance from the front edge of the Martin dread to the front edge of the sound hole on very many.

Most people always talk about the location of the X behind the sound hole. It will change everything if the sound hole is a little more forward or a little rear shifted. The location of the X should be measured in terms of the 12th fret location. This keeps the relationship of the braces with the bridge and bridge plate consistent with the guitar you are trying to emulate.

What is the measurement from the front of the guitar to the front of the sound hole on your Martin D or on your Martin D blue print?


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 Post subject: Re: SM HD28 Plan
PostPosted: Tue Jul 16, 2019 8:26 am 
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Clinchriver wrote:
Based on John Arnolds tracing taken from his original 1937 Herringbone 1"-3/16" from the lower edge of the sound hole to the center of the X. This has been my blueprint for my Dreadnought guitars not sure how it compares to any others.


I'm also using John Arnold's '37 tracing. From front of box at 14th fret to soundhole is 3 3/4", soundhole is 4" so looking at 8 15/16" from front of box to center of the X.

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These users thanked the author SteveSmith for the post (total 2): James Burkett (Tue Jul 16, 2019 5:58 pm) • Clinchriver (Tue Jul 16, 2019 4:58 pm)
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