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 Grain Pattern and Cracks...
Author: Chris P 
Date:   2017-12-01 21:24
Attachment:  cracks.png (60k)

There seems to be a myth doing the rounds (yeah, another one and not the last) that cracks will be a straight line regardless of the grain pattern of the joint.

So let's play a little game and match the grain pattern with the crack that's most likely to form should it crack.

See attachment and have fun!

Chris.

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 Re: Grain Pattern and Cracks...
Author: Chris P 
Date:   2017-12-01 21:27

http://test.woodwind.org/clarinet/BBoard/download.html/1,5678/cracks.png

1 has straight grain that runs parallel with the bore, so will the crack run with it or at an angle to it?

2 has oblique grain, so will the crack run parallel to the bore in a straight line or follow the line of the grain?

3 has wavy grain, so will the crack run parallel to the bore in a straight line or be wavy like the grain?

Chris.

Post Edited (2017-12-01 21:46)

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 Re: Grain Pattern and Cracks...
Author: LC007 
Date:   2017-12-01 22:16

I would guess that the crack will normally run with the grain. The grain separates the wood fibers naturally . Ever try chopping wood across the length of a log? It's pretty hard to do. But in order for a crack to become a crack (and not just a streak in the outer surface of the clarinet) the separation has to reach the bore. And the grain streaks on the inside of the bore do not necessarily match up to the outside of the bore. If they did then I suspect a lot of clarinets would be cracking.

Just my 2 cents.

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 Re: Grain Pattern and Cracks...
Author: Chris P 
Date:   2017-12-01 23:21

The line of grain is the weakest point of the wood, so a stress crack will follow that path no matter what shape it is on the surface as opposed to being a perfectly straight line.

I'm not sure where this whole 'cracks are a straight line' myth has come from and why it's being peddled by people who really ought to know best. This is only going to lead people to believe something that's not always the case and in the worst case for someone to disbelieve a crack following a wavy line is a crack at all.

In this world that seems to be full of fake news, there are still genuine truths if you can see things rationally.

Chris.

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 Re: Grain Pattern and Cracks...
Author: Tony F 
Date:   2017-12-02 21:22

https://blog.spib.org/shakes-checks-and-splits-in-dimension-lumber/

This is a good description of the nature of defects in wood.

Tony F.

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