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Rectangular sound ports

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PeterF

Post subject: Rectangular sound ports

Posted: Fri Aug 23, 2013 6:50 am

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Is it a bad idea to do a rectangular shaped sound port? Would the corners cause stress risers and cracks or is it not an issue?

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B. Howard

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 8:02 am

Brazilian Rosewood

Joined: Mon Dec 27, 2010 9:06 pm
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Location: Magnolia DE
First name: Brian
Last Name: Howard
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I would think a modest 1/4"radius at the corners should make it alright.

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WudWerkr

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 8:05 am

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B. Howard wrote:

I would think a modest 1/4"radius at the corners should make it alright.

And I would probably Bind the sound hole as well , added strength . Same Binding as Guitar edge

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DannyV

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 8:22 am

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Location: Powell River BC Canada
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Last Name: Vincent

An cross grain patch wouldn't hurt.

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Alan Carruth

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 11:33 am

Brazilian Rosewood

Joined: Sat Jan 15, 2005 12:50 pm
Posts: 3933
Location: United States

Now Todd...

For those of you who don't get the reference, look up the DeHavalind 'Comet' airliner. It was the first commercial jet airliner, and had some problems....

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PeterF

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 11:41 am

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First name: Peter
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Alan Carruth wrote:

Now Todd...

For those of you who don't get the reference, look up the DeHavalind 'Comet' airliner. It was the first commercial jet airliner, and had some problems....

Yeah, that was basically what I had in mind when I asked the question!

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Tai Fu

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 2:26 pm

Brazilian Rosewood

Joined: Wed Sep 24, 2008 8:55 pm
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Location: Taiwan
First name: Tai
Last Name: Fu
City: Taipei
Country: Taiwan
Focus: Repair
Status: Semi-pro

Square sound port sounds like the perfect place to have EQ controls in... take the control off and you got a square soundport!

I fixed a cort that had a side crack this way because it was not reinforced.

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Quine

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 9:03 pm

Koa

Joined: Thu Dec 18, 2008 11:42 am
Posts: 1135
Location: Hudson, MA
First name: Kevin
Last Name: Quine
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Corners lead to cracks!

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Spyder

Post subject: Re: Rectangular sound ports

Posted: Fri Aug 23, 2013 11:38 pm

Cocobolo

Joined: Mon Apr 23, 2012 9:50 am
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First name: Phil
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In a past life, I did a lot of work on ultrasonic welding in plastic. We learned real quick that vibrational energy concentrates at sharp edges, corners, etc.

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