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Board index » Mandolin - Mandola - Ukulele Forum

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wbergman
PostPosted: Sun Apr 19, 2015 9:02 am 
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Koa
Koa

Joined: Mon Dec 18, 2006 9:42 am
Posts: 1575
Location: United States
I got a plan that says 1". It scales to 2". One Internet source shows 1-3/4". What size should I use?
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Allen McFarlen
PostPosted: Sun Apr 19, 2015 3:00 pm 
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Joined: Fri Dec 01, 2006 6:44 pm
Posts: 471
Location: Australia
First name: Allen
Last Name: McFarlen
City: Mt. Sheridan
State: Qld.
Zip/Postal Code: 4868
Country: Australia
Focus: Build
Status: Professional
I use 52mm.

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These users thanked the author Allen McFarlen for the post: wbergman (Sun Apr 19, 2015 5:05 pm)
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Quine
PostPosted: Mon Apr 20, 2015 6:43 am 
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Koa
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Joined: Thu Dec 18, 2008 11:42 am
Posts: 1135
Location: Hudson, MA
First name: Kevin
Last Name: Quine
City: Hudson
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Country: Usa
Focus: Build
Status: Amateur
1 3/4" to 2" is a pretty common range. 1" is crazy. Maybe your plan gave the radius instead of the diameter
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unkabob
PostPosted: Mon Apr 20, 2015 2:44 pm 
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Koa
Koa

Joined: Sat Nov 07, 2009 9:34 pm
Posts: 552
City: winnipeg
State: manitoba
Country: canada
Focus: Build
Status: Amateur
I was given a calculation for Helmholz Resonance by Christophe Mineau based on the volume of the instrument .

soundbox volume = V
calculate v/4.188 and take the cube root ,then divide by 4= radius of the soundhole.

The original was done on violins and the correction for guitar frequencies is 17% (my guess is bigger).

The calculation may be too much work for this project but knowing that there is a calculation may be useful on new (weird) future projects.

good luck

Bob :ugeek:
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Ken McKay
PostPosted: Tue Apr 21, 2015 9:31 pm 
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Koa
Koa

Joined: Fri Jan 25, 2008 9:55 am
Posts: 982
Location: Traverse City Michigan
see if this comes through clearly.

It is about everything you might need regarding measures.
building a good one is up to you. duh
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uke_comparison_photo.JPG


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These users thanked the author Ken McKay for the post: PeterF (Tue May 05, 2015 4:10 pm)
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Dennis E.
PostPosted: Mon May 04, 2015 6:07 pm 
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Joined: Wed Dec 29, 2004 1:33 pm
Posts: 270
Location: United States
First name: Dennis
Last Name: Ecklund
City: Athens
State: AL
Zip/Postal Code: 35611
Country: USA
Focus: Build
Status: Amateur
A plan specifying a 1-inch soundhole for a soprano uke would make me suspicious of all other dimensions shown on that plan.

Martin sopranos have a 1.75-inch soundhole. It seems to have worked for them.
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