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Sound Port Backing?

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Paul Burner

Post subject: Sound Port Backing?

Posted: Tue Aug 17, 2010 2:58 pm

Koa

Joined: Thu Feb 28, 2008 11:45 pm
Posts: 730
Location: Lincoln, NE
First name: Paul
Last Name: Burner
City: Lincoln
State: Nebraska
Zip/Postal Code: 68506
Country: United States
Focus: Build
Status: Amateur

Would a couple layers of .010 veneer be enough backing support for a sound port that is just an oval shape or will I need a layer of wood?

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Chris Ensor

Post subject: Re: Sound Port Backing?

Posted: Tue Aug 17, 2010 3:14 pm

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Joined: Sat Dec 05, 2009 3:51 pm
Posts: 1204
First name: Chris
Last Name: Ensor
City: Springfield
State: Missouri
Focus: Build
Status: Professional

I have seen people use no backing at all. But I like to use at least some. I usually don't use any less than .060" though. But maybe that just me.

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LuthierSupplier

Post subject: Re: Sound Port Backing?

Posted: Tue Aug 17, 2010 3:57 pm

Koa

Joined: Sat Jun 24, 2006 12:41 pm
Posts: 975
Location: United States
First name: Tracy
Last Name: Leveque
City: Denver
State: CO
Country: USA
Focus: Build
Status: Amateur

I just theorizing here...but if the port is on a curve it will be stronger than if it was on a flat area. However, since end grain is exposed, I think it is a good idea to protect it from splitting. Any veneer would be better than none. I've never done a oval soundhole, so I've always backed mine with 2 .10 veneers B/W. I'm sure you will be fine with or without. It is more about insurance than anything.

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Peter J

Post subject: Re: Sound Port Backing?

Posted: Tue Aug 17, 2010 4:04 pm

Koa

Joined: Wed Dec 07, 2005 9:08 am
Posts: 535
First name: Pete
Last Name: Liccardello
City: Eden Prairie
State: Minnesota

Paul, I agree with Tracy... you can stack a couple of layers of veneer and match your binding and purflings for a little extra flair..
I have seen them with no backing at all but I prefer a bit of insurance. The layers of veneer can be installed cross grain to each other for a high degree of strength.

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Last edited by Peter J on Tue Aug 17, 2010 4:08 pm, edited 1 time in total.

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TonyKarol

Post subject: Re: Sound Port Backing?

Posted: Tue Aug 17, 2010 4:07 pm

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Joined: Fri Sep 09, 2005 7:51 am
Posts: 3786
Location: Canada

I use either veneers, 20-40 thou, or sometimes and most often just a couple cross braces near where the hole will be.

My house guitar (OM) had one added long after it was built .... no reinforcement, and its fine. I wouldnt want to hit it there, but in normal use it wont do anything.

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