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Finding the flaws in spruce
http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=12160		 Page 1 of 1
Author:  Michael Lloyd [ Wed May 23, 2007 2:59 pm ]
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One way to find those hidden pitch pockets in a spruce top.

This is a Sitka “AA” top and by looking at it under normal light it’s hard to find any flaws like pitch pockets.



So after I’ve sanded the tops to between 4-3mm I’ll inspect them with a strong light in search of flaws. (Beauty marks.)

Here you can see a pitch pocket.



Now under normal light you can make out the flaw. Indicated here by the arrow.



By flipping the top over and viewing with a strong light you will be able to tell on which side it is closest to the surface. Usually the darker and larger the showing indicates that the flaw is closer to the side you’re directly viewing. As in the next picture which is the same flaw. For this top I decided to use the other side as the soundboard’s top surface and finished sanding to 2mm.



I didn’t find anymore.

Author:  Steve Saville [ Wed May 23, 2007 4:32 pm ]
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What exactly is a pitch pocket and why is it important to be able to find?
Author:  Peter J [ Wed May 23, 2007 10:49 pm ]
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Excellent post Todd !

   

It should be archived for future reference!

The only technical detail you omitted is the effect of pitch pockets on MOE and stiffness given the elastomeric nature of their contents.


Author:  Bill Greene [ Thu May 24, 2007 1:21 am ]
Post subject: 
Todd:

That is THE single best explanation of pitch pockets that I have, personally, ever heard. I had no idea why my dog whined so bad when I played...I thought it was me!

Thanks for the insight.

Bill
Author:  WaddyThomson [ Thu May 24, 2007 1:24 am ]
Post subject: 
So, does Shane's Lutz have more perfect pitch pockets than other spruces or just a better chance?  Also, do you suppose it would be possible to find the correct combination of pitch pockets to offset the problem with the G string on Classical guitars?
Author:  crazymanmichael [ Thu May 24, 2007 3:00 am ]
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rotf lmao !!!!!!!!
Author:  Bobc [ Thu May 24, 2007 3:19 am ]
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What?????
Author:  WaddyThomson [ Thu May 24, 2007 3:27 am ]
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Rolling on the floor laughing, and In my arrogant opinion or possibly International Maritime Arbitration Organisation. 
Author:  crazymanmichael [ Thu May 24, 2007 4:49 am ]
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it's an "L" waddy, not an "I"
Author:  WaddyThomson [ Thu May 24, 2007 4:57 am ]
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OIC it is an l.  OOPS!  Explanation:  Laughin my elbow off.
Author:  SteveCourtright [ Thu May 24, 2007 6:18 am ]
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An all along I thought "pitch pockets" had something to do with the game of Cricket and over-sized Tennis shorts...

Nice one Todd!
Author:  Steve Saville [ Thu May 24, 2007 7:03 am ]
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I'm proud to have been Todd's straight man for that nice bit of humor.
Author:  martinedwards [ Thu May 24, 2007 8:12 am ]
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I think I'll go & lie down now!!!
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