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dzsmith
 Post subject: Re: Spring joints
PostPosted: Fri Apr 24, 2015 12:17 pm 
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Joined: Fri May 18, 2012 8:35 pm
Posts: 2660
Location: Austin, Texas
First name: Dan
Last Name: Smith
City: Round Rock
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Zip/Postal Code: 78681
Country: USA
Focus: Build
Status: Amateur
If one assumes the ends shrink more in dry conditions, one must also assume the ends swell more in humid conditions. I'm going for straight joints.

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kencierp
 Post subject: Re: Spring joints
PostPosted: Fri Apr 24, 2015 12:45 pm 
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Koa
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Quote:
If one assumes the ends shrink more in dry conditions, one must also assume the ends swell more in humid conditions


Correct -- but I believe that makes the seam tighter, and is one of the reasons the sound-board or back puffs up in high humidity conditions, however usually without any permanent damage.

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James Orr
 Post subject: Re: Spring joints
PostPosted: Fri Apr 24, 2015 9:54 pm 
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I try to get mine as perfect as possible using a #5 1/2, and check by pressing the halves against a window. It does take me a while...
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Jim Kirby
 Post subject: Re: Spring joints
PostPosted: Sun Apr 26, 2015 9:47 pm 
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Burton LeGeyt wrote:
I make mine perfect before gluing but I did overhear someone whom I consider incredibly knowledgeable about wood and wood movement speak to this- basically he said that if you get the edge perfect on a square plate once you cut the body profile on the outer edge the mating edge will no longer be perfect- I never tried it but haven't forgotten it either.


But doesn't that imply that you glue up the plates after shaping for the body? Who does that?

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Burton LeGeyt
 Post subject: Re: Spring joints
PostPosted: Mon Apr 27, 2015 10:14 am 
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Jim Kirby wrote:
Burton LeGeyt wrote:
I make mine perfect before gluing but I did overhear someone whom I consider incredibly knowledgeable about wood and wood movement speak to this- basically he said that if you get the edge perfect on a square plate once you cut the body profile on the outer edge the mating edge will no longer be perfect- I never tried it but haven't forgotten it either.


But doesn't that imply that you glue up the plates after shaping for the body? Who does that?


Well I don't know of anyone who does. I just shared it since it seemed relevant to the discussion. If the argument re: spring vs. perfect is taken further that would have to come into play. Realistically it is likely not an issue.

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arie
 Post subject: Re: Spring joints
PostPosted: Mon Apr 27, 2015 10:44 am 
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clean, straight, and light tight for me. i have a clamping fixture that i made: base plate, wax paper, back gage, wedges for pressure, and tops bars to keep everything flat.

it's so easy, why over-complicate?
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