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Author Topic: Shake, ring shake, wind shake in timber  (Read 5313 times)

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Offline Brucer

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Re: Shake, ring shake, wind shake in timber
« Reply #20 on: June 13, 2014, 12:15:18 AM »
In BC both the softwood lumber grading manual and the forest service log scaling and grading manual refer to "shake" as a longitudinal split in the growing tree. Both manuals recognize ring shake and star shake.

The older loggers, foresters, and sawmill operators refer to it as "wind shake". I've been told that 90% of the time it occurs on exposed windy slopes. My own experience has confirmed that. This doesn't necessarily mean the wind causes the shake directly -- it could also be that the windy conditions promote the growth of certain types of bacteria.

Shake is easy to spot in Douglas-Fir. There will either be sap oozing out of the split(s), or white, dried sap in the splits. Usually if it's present even at one end, the log will be useless (at least for me).

I've found it just about impossible to spot shake in Western Larch. It's not at all unusual to saw some beautiful timbers FOHC out of Larch, only to have half of the split up the length as they dry. The wood is a dream to cut and makes great looking lumber, but I simply won't buy it.
Bruce    LT40HDG28 bandsaw with two 6' extensions.
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Offline backwoods sawyer

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Re: Shake, ring shake, wind shake in timber
« Reply #21 on: June 13, 2014, 02:15:59 AM »
 

 
the shake, pitch rings in this Doug fir ran up to 40' up the tree, easly spotted from the end of the log.
Got to cut it out or it pops apart so this log was canted up for 4" and 6" CVG and timbers out of the center as the growth rings were to wide for CVG close to the center.
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Offline Magicman

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Re: Shake, ring shake, wind shake in timber
« Reply #22 on: June 13, 2014, 09:14:46 AM »
With valuable logs such as the Sinker Cypress that I am now sawing, kinda treat it as two logs.  Saw the outside layer off of the 4 sides and then deal with the smaller inside core as if it was a smaller log.  Try to avoid producing boards the have the shake line going through it.
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Offline Ron Wenrich

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Re: Shake, ring shake, wind shake in timber
« Reply #23 on: June 13, 2014, 02:08:45 PM »
I've always treated shake as any other defect.  I put it on a corner of a cut and edged it off.  A lot would depend on the extent of the shake.
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