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senunkan
PostPosted: Mon May 06, 2013 1:39 am 
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Cocobolo
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Joined: Wed Jul 04, 2007 5:07 pm
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Location: Singapore
First name: Sen
Last Name: Goh
Country: Singapore
Focus: Build
Status: Amateur
Has anyone tried doing the side mass attachment (a la Trevor Gore)?
I am currently doing one and before I close the box I would like at least to get the side mass attached 1st if possible.
What would be a suitable material for the side mass?
I thought of using fishing weight but they are typically made of lead and considering the toxicity of the material, I don't really want to use it if possible.

Anyone has any good suggestions? Thanks!

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Colin North
PostPosted: Mon May 06, 2013 2:30 am 
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First name: colin
Last Name: north
Country: Scotland.
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I am using bright mild steel.
Are you pre-loading the sides before assembly? How do you know how much to use?
My understanding is that side mass is used to lower (trim) the top resonance after the box is assembled, and testing the coupled top, body and back frequencies.

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.
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Trevor Gore
PostPosted: Mon May 06, 2013 5:55 am 
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Colin North wrote:
My understanding is that side mass is used to lower (trim) the top resonance after the box is assembled, and testing the coupled top, body and back frequencies.

Correct.

Anything dense works. Steel, brass, silver, gold, depleted uranium (if you like exotic-toxic)...

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au
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senunkan
PostPosted: Mon May 06, 2013 8:55 am 
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First name: Sen
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Status: Amateur
Thanks Colin and Trevor for the suggestion.
Well I just wanna make sure I am able to install it via the sound hole before I close the box.

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Clay S.
PostPosted: Mon May 06, 2013 5:28 pm 
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Don't worry about fitting it through the soundhole, just glue it to the outside. Call it - Mass, externally, surfacially secured (M.E.S.S.) and sell it as a feature. Isn't that what the best luthiers do?

Trevor,
Will D.U. give ones guitars that penetrating sound?
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Trevor Gore
PostPosted: Mon May 06, 2013 5:45 pm 
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First name: Trevor
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Clay S. wrote:
Trevor,
Will D.U. give ones guitars that penetrating sound?

Will certainly increase the projection.

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au
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Tony_in_NYC
PostPosted: Tue May 07, 2013 5:43 am 
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First name: Tony
Last Name: C
City: Brooklyn
State: NY
Focus: Build
Status: Amateur
Trevor Gore wrote:
Colin North wrote:
My understanding is that side mass is used to lower (trim) the top resonance after the box is assembled, and testing the coupled top, body and back frequencies.

Correct.

Anything dense works. Steel, brass, silver, gold, depleted uranium (if you like exotic-toxic)...


I wouldn't use depleted uranium. It's almost as hard to export as Brazilian rosewood.

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http://www.CostaGuitars.com
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